cooling - Central States Bus Sales, Inc.
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1. 563 0 BLUE BIRD SERVICE MANUAL Lubricate upper and lower pivot points and track Shutter solenoid mounted to lower left side of N 3 Engine closeout panel 564 ISB only Ge Cummins ISB Install on Left side of air intake manifold elbow 3 To oil supply port b onleft side of engine Mounts to threaded boss just above oil pan flange Turbo Side Of Valve Cover To engine oil pan ae ISB Shutters Hydraulic Optional 3 0 BLUE BIRD 015 00002 Lubricate upper and lower pivot points and track Shutter solenoid mounted to lower left side of engine closeout panel ISB only Cummins ISB Install on left side of air intake manifold elbow a Mount bracket to threaded boss just above oil pan flange w To Accessory Port at Wet Tank AZ P ze Of Valve Cover A COOLING 3 ps ales i Cummins ISB Sh utters Air Optional 565 BLUE BIRD 0 SERVICE MANUAL Radiator On both All American Forward Engine and All American Rear Engine buses the ra diator is pre assembled to a similarly constructed Charge Alr Cooler however other than being assembled and mounted as a combined cooling pack the two units2. serve two separate circuits and do not directly interact While the radiator serves to remove heat from the circulating engine coolant the Charge Air Cooler removes heat from the engine intake air Both perform their functions by passing ambient air drawn by the radiator fan across tubing coils which contain coolant in the radiator or filtered intake air in the Charge Air Cooler The thin corregated fins of each unit conduct heat from the internal coils and thereby disperses it across a broad surface area allowing it to be carried away by the flow of air See the Intake chapter for a more complete functional description of the Charge Air Cooler system In the descriptions below references to the radiator assembly re ferto the combined cooling pack since the radiator and CAC are handled as a unit If the bus is equipped with optional radiator shutters the shutters unit is also attached to the radiator and all three components are removed and installed together Swing Out Radiator On Forward Engine All Americans servicing components at the front of the engine and behind the radiator assembly such as pulleys water pump fan belt fan clutch air conditioner compressors or radiator shutters may require removal of the radiator A popular option on Forward Engine units therefore is a special set of parts which allow the radiator to be pivoted slightly without disconnecting coolant hoses and draining coolant For additional information on t
3. ant level will occasionally rise and drop Top off the coolant level with pre mixed coolant whenever it drops below the full level mark Air has been fully purged from the system when the coolant level no longer fluctuates and the stream of coolant from the bleeder hose is constant This may take 15 30 minutes After the air has been purged and solid stream is present allow the engine to return to idle to cool down gradually Close the bleeder valve and store the bleeder line in its original position Install the radiator cap Operate the engine until the thermostat opens Then stop the engine and let it cool for 15 30 minutes Check the entire cooling and heat ing system for leaks Recheck coolant levels and top off with the same premixed coolant as is installed Obtain a coolant sample from the radiator drain petcock and test the glycol level with a refractometer to ensure the glycol level is 50 minimum If the glycol level is less than 50 drain the appropriate amount of coolant and add concentrate per the engine manufactur er s instructions for increasing glycol percentage to correct level Pressure test the cooling system for leaks If no leaks are found the bus may be returned to normal service COOLING 571 0 BLUE BIRD SERVICE MANUAL Fan Clutch During normal running engine temperature is regulated by controlling the cooling effectiveness of the radiator This is accomplished by powering and de pow
4. as Extended Life coolant Always Mix Concentrate With Premix Coolant Not Water If concentrated coolant is added in order to raise the glycol ratio use only the con centrate version of the same premix coolant type and brand as installed Do not mix the concentrate with water Instead mix the concentrate with the premix version of the same coolant Only Add Tap Water In Emergency Situations A regularly scheduled bus inspection and maintenance program should be followed to prevent coolant losses due to damaged or worn hoses loose clamps etc If coolant is lost while the bus is in use and roadside emergency measures are called for replenish the coolant with the same premix type and brand if possible If the proper coolant is not available and water must be used use only de ionized wa ter if possible Ordinary tap water should only be used if proper coolant or de ionized water are not available Whenever tap water alone has been added the bus should be taken to a service facility and the entire cooling system should be completely drained flushed and refilled with premix coolant COOLING Note For more information on coolant testing tools see www cumminsfiltra tion com pdfs product lit americas brochures LT15068 pdf 561 0 BLUE BIRD SERVICE MANUAL FACTORY INSTALLED COOLANTS Cummins Fleetguard ES Compleat Blue in color Standard equipment coolant in all D3FE D3RE BBCV Considered standard life coolan
5. at the factory The coolant manufacturer s part number for one gallon quantity suitable for regular top off and refill The coolant manufacturer s part number for one gallon quantity of the con centrate version ofthe installed coolant suitable for formulating stronger gly col mixture ratio Blue Bird also installs a second decal containing radiator warnings Both decals are mounted near the coolant fill neck 0 BLUE BIRD Coolant Maintenance Blue Bird advises strictly abiding by the following policy for all coolant maintenance for the life of the vehicle Never Mix Coolant Types Routine coolant addition top off must match the installed coolant type and brand Do not mix coolants of different colors types or brands in the same engine Strictly Follow The Engine Manufacturer s Specifications Each engine manufacturer publishes its own specific requirements for testing and maintaining coolant in their respective engines Blue Bird recommends strictly abid ing by the engine manufacturer s testing and maintenance schedules and draining flushing refilling procedures to maintain compliance with the engine warranty re quirements Blue Bird recommends that you maintain accurate vehicle specific ser vice records of all coolant system maintenance procedures performed For Cummins engines using Fleetguard ES coolants send coolant samples to Fleetguard for Monitor C testing as specified in the Cummins Operator s Manual Label sample
6. closed at certain temperatures by an air cylinder and on buses with hydraulic brakes by an hydraulic actuator Unlike the radiator fan shutters are not controlled by the engine ECU but by their own independent circuit Two temperature sensors one mounted in the engine coolant circuit and the other in the intake tract of the Charge Air Cooler system are wired in the Radiator Shutters control circuit Both sensors are normally closed When ignition is on current passes through both sensors and energizing the Shutter control solenoid to close the shutters As the engine warms one or both of the two sensors create an open in the circuit de energizing the shutter control solenoid and allowing the leuver vanes to open the shutters Air powered shutter solenoids receive actuation air from a line leading directly to the supply wet air tank When the solenoid opens the air which was closing the shutters is expelled through the solenoid s exhaust port Hydraulically powered shutter solenoids receive engine oil from a line leading from an oil supply port on the left side of the engine When the solenoid opens the oil which was closing the shutters is returned to the engine sump through the sole noid s drain line Shutters should be inspected regularly and kept free of obstructing debris The pivot points of the leuvers and their linkages should be lubricated periodically with a light spray lubricant such as WD40 or a graphite spray COOLING
7. COOLING Overview Coolant is circulated through the closed pressurized system by the engine s wa ter pump whenever the engine is running When the engine is cold coolant flow through the radiator is blocked by a conventional thermostat mounted at the engine coolant outlet The closed thermostat causes the coolant to be directed through a bypass integral to the engine block when the engine is cold As the engine warms heat is transferred to the coolant and the thermostat grad ually opens the radiator circuit while increasingly obstructing the bypass Coolant from the engine s coolant outlet increasingly enters the radiator at the top passes through the radiator s coils and leaves the radiator at the bottom on its way back to the engine coolant inlet When the engine has reached full normal operating tem peratature the thermostat is fully open the bypass path is closed and all coolant circulates through the radiator During normal running engine cooling is regulated by controlling the effec tiveness of the radiator This is accomplished by powering and de powering the fan which draws ambient air over the coils of the radiator On Forward Engine All Ameri cans the fan is mounted to an electromagnetic fan clutch assembly mounted to the front of the engine and driven by the fan belt The engagement and disengagement of the fan clutch is controlled by the engine ECM The electrically controlled fan clutch of the All American Forward Engine is
8. applicable federal state and local laws governing disposal of engine coolant Be sure that all the heater valves are open in order to com pletely drain the engine heaters coolers hose etc 1 4 After system has drained disconnect both the pressure and return heater hoses Using a shop air hose set at a maximum of 15 PSI blow air into the heater hoses to blow the remaining coolant from the heat er system 1 5 Open the lowest coolant drain port or plug from the engine to drain any remaining coolant from the engine 1 6 Close all drains reconnect heater hoses and reinstall all plugs that have been opened or removed 12 If the system has a coolant filter close the valves to the filter and re move the filter element 0 BLUE BIRD COOLING 1 8 On All American Forward Engine Only If the system has any mate rial collected on the cap neck or deaeration tank remove and replace the radiator cap 00065628 and plastic deaeration tank 00126417 If the system has discolored coolant inspect the cap neck and deaera tion tank for accumulation of foreign material or staining If stained clean the components If the stain cannot be removed replace the components If the coolant is not discolored and there is no accumu lation on theses components do not replace these components 1 9 Reconnect all hoses that were disconnected while replacing compo nents Check all hose connections and clamps 1 10 If the thermostat has be
9. bs ft 41 Nuts 18 20 Ibs ft 44 Nuts 30 32 Ibs ft All Spring Loaded and 5 Ibs ft Constant Torque Clamps BLUE BIRD Hi Torque Transmission COOLING To Engine water inlet Standard Low Torque Transmission 0000677 8 5 SERVICE MANUAL A About Coolant As emission and performance regulations become more stringent the normal op eration temerature range for turbocharged diesel engines increases One of the con sequences is that careful maintenance of the cooling system becomes increasingly critical in prolonging the life of the engine At higher temperatures relatively minor imbalances or impurities in the coolant can dramatially increase the potential for corrosion Establish a disciplined and consistent regimine for monitoring and testing the coolant in your Blue Bird school buses Keep accurate records use only coolants recommended by the engine manufacturer Change coolant within its specification lifetime and never mix different types of coolant Periodic testing and maintenance of the coolant should be performed in accor dance to the engine manufacturer s specifications Testing and maintenance proce cures differ between standard life and extended life coolants Locally available test strips may be used to test standard life coolants However such test strips are not ap propriate for l
10. described in the electrical chapter On buses operated in colder climates the radiator may be fitted with optional Radiator Shutters a vane like assembly which serves to block air from passing over the radiator coils This prevents over cooling and aids warm up of the coolant so that interior heaters become effective sooner The Radiator Shutters may be either hy draulically controlled powered by engine oil pressure or pneumatically controlled powered by air pressure from the supply tank of units with air brakes or air suspen sion The cooling system components are plumbed using either standard black rubber hoses or optional hoses which are blue in color and typically have longer life The bus may be fitted with an optional Perry Coolant Filter which is attached to the engine water jacket at two locations creating an alternate side path for coolant to flow The filter traps contaminates as coolant circulates through the replaceable filter Engine coolant also circulates through a separate transmission cooler Unike the coolant filter this portion of the coolant s flowpath is not a parallel alternate path ofthe coolant flow Once the engine has reached normal operating temperature and the thermostat has fully opened all the coolant passes through the transmission cooler in series with the radiator The inlet side of the transmission cooler receives coolant that has already passed through the radiator Inside the transmission coole
11. em If cleaner is not completely removed ammonia salts will be left from the cleaner and severe copper corrosion can occur 0 BLUE BIRD SERVICE MANUAL 3 If the bus is equipped with an optional coolant filter check the filter head clean filter head and lines as required to remove all of the old coolant and any residue Install a new coolant filter element 4 Refill the cooling system with coolant recommended by the engine manu facturer Read the About Coolant section of this chapter thoroughly for infor mation about the coolants installed at the Blue Bird factory and for Blue Bird recommendations Blue Bird recommends using only pre mixed coolant or mixing of premixed coolant with concentrate of the same type and brand as opposed to mixing concentate with water to raise the glycol ratio above that of the premixed coolant Blue Bird recommends always topping off coolant with the same pre mixed coolant as is installed rather than topping off with water If water is used for top off use only deionized water Never add tap water to the cooling system unless absolutely necessary in roadside emer gency situations Never mix coolants of different color type or brand Keep accurate records of all coolant changes and maintenance 5 0 5 Bleed Air From the Cooling and Heater System 5 1 Fully open the pressure side heater hose cut off valve Fully close the return side heater cut off valve located near the transmission cool e
12. en removed in an earlier step reinstall ther mostats following engine manufacturer s procedures 2 Clean the Cooling System Follow the engine manufacturer s instructions for chemically cleaning the entire cooling system 569 On Cummins engines If sludge or oil is evident Use Fleetguard Restore For scale or heavy metal deposits use Fleetguard Restore Plus 2 1 Afterthe engine has been stopped and the cooling system has cooled drain the cleaner from the entire system following the steps describe in the initial drain including blowing the system with 15 PSI max of shop air 2 2 Close all drains and reconnect all hoses that have been removed 2 3 Fill the system with fresh water and run for minimum of 30 minutes on high idle with heater pumps on and all heater valves open 2 4 After the 30 minute minimum run stop the engine and allow it to cool Then drain the water from the entire system following the steps describe in the initial drain including blowing the system with 15 PSI max of shop air 2 5 With the hoses disconnected and the drain valves open run fresh water through the heater system radiator transmission cooler and engine until the water is clear 2 6 Repeat steps 2 2 thru 2 5 as many times as required to ensure that the system is clean and the chemicals are completely removed After having used cooling system cleaners be sure the systems are flushed 3 5 times to remove all cleaner from the syst
13. ering the fan which draws ambient air over the coils of the radiator On All American Forward Engine buses the fan is mounted to an electromag netic clutch mechanism The outer housing drum of the fan clutch is a pully driven by the fan belt and rotates whenever the engine is running The fan blade assembly is mounted to the inner rotor of the fan clutch An electromagnetic mechanism within the fan clutch assembly engages disengages the inner rotor with the outer drum and also serves to cushion the initial shock of engagement The engagement and disengagement of the fan clutch is controlled by the en gine ECU The ECU electronically monitors a signal it receives from a temperature sensor mounted near the engine coolant outlet When the temperature signal reach es a pre defined value the ECU provides 12V current to engergize the fan clutch The clutch engages and the fan blades are driven at engine speed drawing more air through the radiator 572 When the fan clutch is de energized the collapsing magnetic field momentarily induces a current with reversed polarity in the stator The electrical connector of the fan clutch contains a diode which provides the induced current a low resistance path to ground to protect other circuits from being affected 0 BLUE BIRD
14. erior engine compartment hood fectiveness of all heaters by regulating the amount of engine coolant circulating through the heater circuit Depending upon the heaters configuration the heater circuit may be equipped with an optional auxilliary water pump to help force circulate coolant through the heaters The auxilliary pump on Forward Engine All Americans resides in a dedicated 554 housing mounted to the floor along the heater piping The inlet side of the auxilliary pump receives coolant from the high pressure side of the engine water jacket The outlet side leads to the series of heaters and then returns via the transmission cooler as described above Thus the transmission cooler receives coolant that has cooled by transferring its heat to the heaters and or by passage through the radiator The cooling filler neck is integral to a deaeration tank located at the highest point of the cooling system flow circuits Tubes lead to the deaeration tank from the tops Forward Engine heater return cutoff valve Accessible from under the bus forward of the entrance stepwell of the radiator the engine and the transmission cooler This provides a path for air bubbles in the circuits to rise to the deaeration tank When pressure inside the sys tem rises sufficiently to overcome the spring of the filler neck s pressure cap air that has collected in the top of the deaeration tank escapes reducing the system pressure to normal On Forward Engi
15. he swing out radiator see Swing Out Radiator in the Chassis Frame section of the manual The actual mounting of the radiator unit itself is very similar between the stan dard installation and that of the swing out radiator option The components which differ are e Longer coolant hoses to allow the necessary flexibility at the radiator A special set of bumper brackets which allow the bumper to pivot downward without complete removal Radiator Removal 1 Completely secure the bus against accidental movement Remove the igni tion key Chock all wheels Disconnect the positive battery terminals or turn off the master power switch if so equipped 2 Pivot or remove the front bumper see Bumpers in the Chassis Frame sec tion of this manual COOLING 3 Open the front grille panel 4 Inside the bus remove the engine cover see Engine Access in the Power Drivetrain section of this manual 4 1 Remove the cup holder and PA system mic 4 2 Pull and release the rubber handle latch anchor located at the lower front wall of the engine hood assembly 4 3 Open the hood and locate four latches on the inner wall perimeter of the hood assembly Releasing these latches will then allow entire hood assembly to be removed for mechanics access 5 Loosen all charge air cooler tubes 6 Drain the coolant 6 1 Position a clean receptacle under the petcock drain at the bottom of the radiator Remove the filler pressure cap Open the petcoc
16. in flush refill Blue Bird recommends that an authorized Cummins dealer distributor perform this flush and fill If there are differences between the information in this procedure and the engine manufacturer s Operator s or Maintenance Manuals follow the engine manufacturer s instruction 1 Drain the cooling system 1 1 Park bus on a level surface apply parking brake turn off engine re move ignition key and chock wheels 1 2 Allow the engine to cool Then remove the radiator cap Locate and open both heater hose cut off valves Open all heater control valves fully Removal of the thermostat may assist in draining flushing rins ing and refilling process Follow engine manufacturers recommenda tions on thermostat removal and installation 568 CEN Coolant released under pressure can cause serious burns Re move filler cap only when cool enough to touch with bare hands Slowly loosen cap to first stop to vent pressure before fully removing Engine coolant is toxic and is an eye and skin irritant Protective gear should be worn when working with coolant Allow the system to cool before draining and flushing Engine coolant is a threat to the environment Use suitable containers for disposal All applicable federal state and local laws must be observed when disposing of engine coolant 1 3 Placea drain pan under the radiator drain and open the drain petcock Drain and discard the coolant from the cooling system following all
17. k drain Tip After draining at the petcock stops it is often helpful to also loos en the lower radiator hose clamp and insert a screwdriver between the hose and the radiator This allows additional coolant to drain from the dip in the lower hose 6 2 Disconnect the radiator hoses Loosen the deaeration vent hose clamp at the top of the radiator and push the vent hose end off the radiator Loosen the upper and lower radiator hose clamps and push the hoses back enough to ensure they are unstuck and will slip off when the radiator is removed 12 The radiator assembly is mounted on four rubber cushioned mounts two on each side Completely remove all four mounting bolts eight washers and four nuts With an assistant lift the radiator forward and away from the bus Reassembly Having the radiator removed or hinged provides access to engine front components After the service procedures are complete reinstall the radiator bumper rock guard CAC tubes and grille in reverse order of the removal proceure outline If the coolant has been drained into a clean recepticle and if it is still within its service life it may be reinstalled After refilling bleed the heater system to remove trapped air and ensure that the coolant level is topped off to the proper level 567 0 BLUE BIRD EE r SERVICE MANUAL VIA py Ji Cooling System Drain Flush amp Refill Thefollowing is a general procedure for complete coolant change dra
18. lutch Motor Shutters an alternate parallel path for IS controlled by open and close coolant to flow Shut off valves the engine ECM according to temperature measured at both the water jacket and the intake air On A3FE electromagnetic Fan Clutch cycles on and off On A3RE hydraulic motor varies in speed provided to isolate the filter for element change AR KEKEKKKKKKEREEK Ky Vy 4 ee j 222222222222 2202420 2720 2202020202 4 122 2 2 2 4 A ty D x Peepy CEEEKEEKEKEREEKEKEREKEEEKEEKEEKEK UEEEER A Addn trm SS AEEEEEEEE Transmission Cooler Aa coil through which transmission fluid circulates is bathed in engine coolant to carry away heat Also serves as the return point of coolant circulating through heaters Heater Cut Off Valves e BLUE BIRD SERVICE MANUAL 558 Engine Vent To 3 4 port f on water inlet To Air ntake elbow on left side of engine e To Engine water outlet To Turbo Compressor outlet Cooling System Diagram Torque Specifications 16 Capscrews 20 25 Ibs ft 27 Nuts 80 I
19. mission fluid may be very hot possibly above the boiling point at atmospheric pressure Allow the system to cool completely before working on it Engine coolant use and disposal is gov erned by environmental regulations Read carefully and abide by the warnings and guidelines on the coolant label COOLING 555 0 BLUE BIRD D3 FE SERVICE MANUAL Driver Side Heater a Remote Heater Valve CHYSNEWWNYYVOYVNYWYYCSTWSYNYW VY NY 0 TIITII Passenger Compartment Heaters Auxiliary Pump Optional pump helps circulate engine coolant through heaters May be installed at various locations depending upon heater configuration lt a Right Front Heater COOOL OOOO OG TIT IT IIIT TITS Sn CEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEREEEER KK CS A 2 e BLUE BIRD COOLING Coolant Filter Optional filter unit mounted in Fan C
20. ne All American s the radiator must be removed to gain access to certain service components on the front of the engine To facilitate this an option popularly installed on Forward Engine buses is a swing out radiator which provides limited access without requiring draining of the coolant The three main symptoms of trouble in the cooling system are overheating overcooling and loss of coolant A cooling system should first be diagnosed by a thorough visual inspection Debris accumulation in the radiator fins or bent fins re stricting airflow can cause overheating If visual inspection reveals no cause tools and test equipment will be needed to proceed 0 BLUE BIRD When excessively high operating temperature is observed first check for proper fluid level at the sight glass of the deaeration tank If the fluid level is low and cannot be maintained without constant refill inspect for leaks at pipe and hose connections Also look for damaged hoses due to heat or chaffing from incorrect routing Remem ber that the heater system is a potential area for leaks The heating system can be isolated by closing the gate valves at the engine s heater outlet and the transmission coolers inlet In the case of overheating the next step is to verify the proper operation of the thermostats Refer to the appropriate engine manufacturer s service publication for instructions on the removal and testing of the thermostats CAN The engine coolant and trans
21. ong life coolants therefore long life or extended life coolants must be sample tested at qualified cooant laboratories Because specification recommenda 560 tion and terminologies differ among engine manufacturers Blue Bird advises stictly adhering to the coolant maintenance specifications of the engine manufacturer Carefully following the engine manufacturer s recommendations is the surest way to maintain compliance with engine warranties Beginning in January of 2007 Blue Bird implemented a program to simplify the coolant types installed at the factory Standard Equipment Coolant Cummins Fleetguard ES Compleat 50 50 premix blue in color is installed as stan Note If you wish to convert from stan dard equipment with Cummins dard life coolant to Fleetguard ES Op This coolant meets all specifications and requirements for extended life coolant timax extended life coolant follow the and is to be considered standard life coolant when installed in Cummins engines guidelines set forth in the Fleetguard Maintenance Bulletin MB1 04 1 at Optional Extended Life Coolant www cumminsfiltration com pdfs prod Cummins Fleetguard ES Optimax 60 40 premix red in color is installed in bus prod uct lit americas brochures MB1 04 1 ucts equipped with Cummins engines when purchased with an option for extended pdf life coolant Coolant Decals On all of the above listed bus models Blue Bird installs a decal stating The type of coolant installed
22. r 5 2 In the Driver s area open all heater temperature controls to their full on position and turn on all heater pumps The number of heater controls and the presence of heater pumps depends upon optional equipment purchased on the bus 5 3 With the engine stopped and a cool engine remove the radiator cap 5 4 On All American buses locate the 1 4 bleeder tube which is located near the deaeration tank The bleeder tube originates from a low point of the cooling system where the return heater hose returns coolant to the transmission cooler and runs to a location near the deaeration tank On All American Forward Engine buses Open the front grille panel The bleeder tube is tucked horizontally along the top of the radiator Pull out the bleeder hose and insert its free end into the open filler neck of the deaeration tank Then open the in line bleed valve fully During bleeding overflow coolant will be returned directly to the de aeration tank 0 BLUE BIRD 5 5 5 6 9 5 8 5 9 5 10 5 11 5 12 Start engine and operate at 1800 to 2000 rpm Watching the coolant temperature gauge ensure the engine reaches 180 190 degrees the temperature at which the engine s thermostat normally fully opens Operate the engine with the bleeder valve open until all air has been purged from the system During this time monitor the level of coolant in the deaeration tank As air trapped in the system escapes the cool
23. r the water circulates around a coil through which transmission fluid circulates At normal operating temperatures the engine coolant is significantly cooler than the the transmission fluid and thereby serves to cool the transmission fluid In extremely cold climates during engine warm up the warming engine coolant helps bring the transmission fluid up to sufficient temperature for the transmission to operate 553 0 BLUE BIRD Fy ALL SERVICE MANUAL nj 3 i 6 c Heated engine coolant also provides the heat for the bus s interior heating units The heater plumbing circuit is a parallel circuit which begins at the high pressure side of the engine water jacket cycles through the various heater elements and re turns by way of an inlet to the transmission cooler There it rejoins the coolant bath circulating through the transmission cooler and thereby finds its way back to the engine inlet A cut off valve is provided at engine heater outlet pipe and at the trans mission cooler s heater circuit inlet This allows the heating circuit to be blocked at both ends when servicing the cooling system or when it is desireable to prevent heaters from warming up during summer months The heater supply tubing from the engine leads to the Driver s remote heater valve an electrically controlled valve which enables the Driver to control the ef Z i OX 3 eA ae Forward Engine heater supply cutoff valve Accessible from int
24. t in Cummins engines Concentrate version may be mixed with the pre mix version to lower freezing point AVAILABILITY 50 50 Premix 1 Gallon Container 2 1 2 Gallon Container 55 Gallon Drum 330 Gallon Tote Concentrate 1 Gallon Container 562 Cummins Fleetguard ES Optimax Red in color Optional coolant in D3FE D3RE BBCV with Cummins engines Qualifies as extended life coolant in Cummins engines Blue Bird installs 60 40 premix which is not available in one gallon containers but is available in larger containers listed The 50 50 premix may be mixed with the concentrate version per Fleetguard s instructions to achieve 60 40 ratio Concentrate version may be mixed with the pre mix version to lower freezing point AVAILABILITY 50 50 Premix 1 Gallon Container 60 40 Premix 55 Gallon Drum 275 Gallon Tote Concentrate 1 Gallon Container 0 BLUE BIRD Radiator Shutters Your bus may be equipped with Radiator Shutters a popular option on both Forward Engine and Rear Engine All American buses operated in colder climates Shutters restrict ambient air passing through the radiator and over the engine and thereby shorten warm up time for the engine and passenger compartment heaters The Kysor Radiator Shutters unit is a window blind like assembly of adjustable louvers mounted on the fan side of the radiator The shutters are spring loaded in a normally open position On buses equipped with air brakes the shutter mecha nism is
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