1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 134Get this manual
General Information Spark Plug The spark plugs should be removed and examinedIf the electrodes are worn, or plug has cracked insulator or shows other signs of damage, spark plug should be replacedSee Specifications, Section 1Before installing the high tension lead cover on the spark plug, fill the cover with approximately 1cc of OMC Triple-Guard GreaseThis will help prevent corrosion of the spring terminal onto the spark plug and high tension arcingSpark Test 1Remove the high tension lead from each spark plugTo prevent damage to the spring terminal on the high tension lead, twist and pull on the cover 824037
2Adjust the air gap of the spark tester to specificationssee Table and connect the tester leads to the high tension leadsSecure the other end of the spark tester to clean engine ground
Table Model 65 and 100 155 Ignition System C.DC.DSpark Tester Gap 12 mm (12 in,) 11 mm (716 in
INotel To prevent at least 51 mm of high voltage,metal surfacepossible arcing position the tester leads (2") from any