1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 75Get this manual
Trouble Check Chart (Cont TROUBLE POSSI BLE CAUSE MOTOR ADJUSTMENTS Incorrect Prope II er Mounts looseloss of rubber bond Incorrect trim angle Remote controls incorrec tly adjusted BVENTILATION Protruding hull attachments Keel too long Bent propeller (vibration) Transom too high CBOAT Improper load distribution Marine growth on bottom Added weight (water absorption) Hook in bottom Catamaran (single engine)venturi effect DCARBURETORSee Section High speed je ts plugged Idle pick-up tube not touching front edge of high speed nozzle In venturi ACONTROL BO AND CABLE CONNECTIONSSee Section Control box andor DOwer head connections BGEARCASE See Section Incorrect lubricant (OMC HI-VIS Gearcase Lube only) Faulty adjustment Shi ft rod connector misad justed Low oil level Shi fter dog or spri ng damaged AALTERNATOR SYSTEMSee Section Faulty wiring Recti fier diodes damaged Shorted or open stator windings Regu Iator damaged ASTARTING CIRCUITSee Section Weak or shorted battery Loose or corroded battery connections Throttl advanced too far Gear sh ft not in neutral Defective neutral start switch Defective key switch Jammed starter drive Damaged starter drive parts Wrong rotation (Bosch) brushes in wrong Worn brushes (stuck brush) Broken brush spri ngs Open circuit in solenoid Burned commutator Broken field terminal Shorted or open windingsormoture or field 20 AMPFuse blown BEXCESSI VE STARTER CURRE NT DRAWSee Section Worn or dry armature shaft bearings Excessive fri ction in engine Brushes not seating Dirty or corroded commutator Loose pole pieces Beari ng heads buckl ed