Suzuki outboard motors 1988 2003 repair manual., Page 256Get this manual
7-44 POWERHEAD strokesIt also provides sealing surfaces for the upper and lower seals and provides surface for the labyrinth seal to hold oil against and groove in which sealing rings are installed to seal pressures into each crankcaseMounted main bearings control the axial movement of the crankshaft as it accomplishes these functionsThe crankshaft bearing journals are case hardened to be able to withstand the stresses applied by the floating needle bearings used for connecting rod and main bearingsIn essence, the crankshaft journals are the inner bearing races for the needle bearingsThe crankshaft cannot be repaired because of the case hardening and the possibility of changing the metallurgical properties of the material during the welding and machine operation Also, there are no oversized bearings availableRepairs are limited to cleaning up the journal surface with 320 emery paper when loose needle bearings are run on the journalWhere caged roller bearings are run, the journal may be polished with crocus clothThe tapered end of the crankshaft has spline or keyway and key which times the flywheel to the crankshaftInspect the spline or key and keyway for damageThe crankshaft taper should be clean and free of scoring, rust and lubricationThe taper must match the flywheel hubIf someone has hit the flywheel with heavy hammer or has used an improper puller to remove the flywheel, the flywheel and hub may be warpedPlace the flywheel on the tapered end of the crankshaft and check the fitIf there is any rocking indication distorted hub, replace the flywheelAlways use puller which pulls from the bolt pattern or threaded inner hub of the flywheelNever use puller on the outside of the flywheelThe taper is used to lock the flywheel hub to the crankshaftWhen mounting the flywheel to the crankshaft the taper on the crankshaft an in the flywheel hub must be cleaned with fast evaporating solventNo lubrication on the crankshaft taper or flywheel hub should be doneThe flywheel nut must be torqued to specification to obtain press fit between the flywheel hub and the crankshaft taperIf the nut is not brought to specifications, the flywheel may spin on the crankshaft causing major damageThe flywheel key is for alignment purposes and sets the flywheel's relative position to the crankshaftCheck the key for partial shearing on the sideIf there is any indication of shearing, replace the keyAlso check the keyway in the flywheel and crankshaft for damageIf there is damage which will allow incorrect positioning of the flywheel, the powerhead timing will be offINSPECTION