2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 215Get this manual
ILOWRIChecking the pinion and forward gear Check the teeth of the pinion, and the teeth and dogs of the forward gear for cracks or wearReplace the pinion or gear if necessary
Lower unit
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Checking the lower case
1Check the skeg and torpedo for cracks or damageReplace if necessary
Checking the bearings
1Check the bearings for pitting or rumblingReplace if necessary
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