When troubleshooting Mercury Outboards with
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1. SERVICE BULLETIN A Thunderbolt Ignition Spark When Switch On or Off B Battery Lead and External Harness Installation Merc 650 C Water Pump Impeller Installation D Emergency Cowl Removal 1974 Merc 110 75 E Bottom Cowl Drain 1974 Mere 110 75 A THUNDERBOLT IGNITION SPARK WHEN SWITCH ON or OFF Attach Service Bulletin Sticker on Pages 3C 9 12 13 14 16 of Your Service Manual When troubleshooting Mercury Outboards with Thunderbolt Ignition a spark may occur across the spark gap tester when turning the ignition key On or Off The presence of this spark is normal and does not indicate a faulty ignition component B BATTERY LEAD and EXTERNAL HARNESS INSTALLATION Merc 650 Attach Service Bulletin Sticker on Page 2A 1 of Your Service Manual Mechanics and boat riggers are cautioned to properly install external harness and battery leads on Merc 650 Outboards as shown in Figures land 2 Install a sta strap around the harness battery leads and control cables as shown in Figure 3 Ge m anmiana omy m mp Figure 2 External Hamess Connector over Battery Leads al 08460 Figure 1 Internal Hamess Connector and Bat tery Leads in Position eS z5 Figure 3 Sta Strap Installed around Harness Battery Leads and Cables OVER C WATER PUMP IMPELLER INSTALLATION Attach Service Bulletin Sticker on Pages 6A 7 6B 7and 6C Sof Your Service Manual When completing ge2. ar housing repairs that require removal of the water pump impeller it is recommended that the impeller be replaced If it is necessary however to re use the impeller DO NOT install in reverse to the original rotation or premature impeller failure will occur D EMERGENCY COWL REMOVAL 1974 Merc 110 75 Attach Service Bulletin Sticker on Page IA 4 of Your Service Manual If the top cowl latch fails to function on a 1974 Merc 110 75 proceed as follows 1 Insert a 11 64 4 4mm maximum di ameter rod through the hole in the right rear of the bottom cowl as shown in Figure 4 2 Push the rod against the cowl release lever and remove the cowl by lifting off up and forward Figure4 Inserting Rod in Hole E BOTTOM COWL DRAIN 1974 Merc 110 75 Attach Service Bulletin Sticker on Page 1A 4 of Your Service Manual Model 1974 Mere 110 75 Outboards require 6 additional drain holes in the bottom cowl assembly Drill the six 3 16 4 8mm diameter holes as shown in Figure 5 aes i Figure 5 Six 3 16 Diameter Holes in 1974 Merc 110 75 Models
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