Home

Actron CP7827 Operating Instructions

1. CP7827 INSTRUCTIONS FOR COMPRESSION TESTER Test Procedure 1 Runthe engine for about ten min utes or until it reaches normal operating temperature before per forming the compression test 2 Stop the engine Disconnect all the spark plug wires and number them in the order in which they were removed this makes them easy to identify for reconnection 3 Loosen all spark plugs about one turn but do not remove them Use an air hose or stiff brush to remove all the dirt from the spark plug wells Remove the spark plugs and place them on aclean flat surface in the order in which they were removed This proce dure will help to correlate any compression or cylinder problems with the condition of the plug from the particular cylinder involved 4 Remove the air filter and set the carburetor throttle plates to the wide open throttle position using a string or wire See Figure 1 CAUTION Failure to return the carbure tor throttle plates to the closed throttle position before start ing the engine can cause seri ous engine damage Fig 1 Hold Open Throttle Plates CARBURETOR STRING OR WIRE Fig 2 Grounded High Tension Lead JUMPER 5 Remove the high tension lead from the center of the distributor and connect to ground as shown in Figure 2 To disable electronic ignition systems disconnect the electronic ignition module or re move the primary battery termi nal f
2. avel up scale on each compression stroke until it Fig 6 Compression Gauge Repair Parts reaches a peak value All cylinders should indicate a pressure that is within the vehicle manufacturer s specifications and the reading should not vary more than 10 from cylinder to cylinder If the needle fails to travel up scale as described in Step 1 or if it re mains at the same value for sev eral strokes and then starts to climb the cylinder has a sticking valve Ifthe compression reading is con siderably higher than the vehicle manufacturer s specification itin dicates carbon buildup in the cyl inder If a reading on two adjacent cylin ders is 20 pounds or more lower than the other cylinders a defec tive head gasket is indicated Water coolant and or oil may be found in the two cylinders under these conditions If the readings are low or vary widely between cylinders pour a teaspoon of clear S A E grade 30 oil into each cylinder and retest If the readings increase consider ably the fault may be due to poorly seated or worn piston rings If the readings remain about the same the valves and or associated com ponents are likely the cause Clean regap and reinstall the spark plugs in the same order in which they were removed or install new spark plugs Reconnect all spark plug wires in the proper order Remove the string or wire from the carburetor throttle plates and make certai
3. n it returns to closed throttle position Reconnect the ignition system Key No Part No Description 1 0031 000 0246 Compression Gauge 2 0180 000 0772 Quick Disconnect Coupling amp Valve Assembly 3 0032 000 0109 Spark Plug Hose Assembly 4 0180 000 0775 2 ea Air Valve High Pressure 5 0400 000 1350 O ring 6 0400 000 1349 2 ea O ring 7 0180 000 0895 Deep Reach Adapter 0002 004 2018 Instruction Manual Not illustrated NOTE Do not use automotive tire air valve as a replacement part
4. rom the ignition coil On GM HEI V 8 and V 6 disconnect the primary lead from the distributor cap Figure 3 Fig 3 Disabled GM HEI Ignition System r PRIMARY WIRE 6 Disconnect the hose from the gauge Screw the spark plug adapter hose Item 3 Figure 6 into a spark plug well Hand tighten only DO NOT USE A WRENCH See Figure 4 NOTE On engines with 14mm long reach plugs use the long reach adapter Item 7 Figure 6 Do not use the adapter in short reach holes it may hit the top of the piston and damage the engine Fig 4 Installation of Compression Gauge 7 Insert the spark plug hose into the gauge by pulling up on the outer sleeve of the gauge s quick disconnect coupling and allow it to snap back as the fitting en gages the adapter 8 Crank the engine for at least four compression strokes or until the pressure reading stops rising on the gauge 9 Record the compression read ing then push the side release valve to relieve the pressure as shown in Figure 5 Repeat the test Record the reading relieve the pressure remove the gauge from the hose and remove the hose from the spark plug well Fig 5 Push Release Valve to Relieve Pressure 10 Reconnect the hose to the next spark plug well to be tested and repeat steps 6 through 10 for the remainder of the cylinders to be tested Test Results 1 On a normal cylinder the gauge needle should tr

Actron CP7827 Operating Instructions

Contents

Download Pdf Manuals

Related Search

Related Contents