1983 Yamaha 30EN Outboards Service Manual, Page 106Get this manual
Maximum propeller shaft runout: 0.02 mm (0.0008 in) Check the contact surface of the drive shaft with the oil seal for grooved wear3Check the drive shaft splines, both engine and pinion side4Check the ball bearing and needle bearing for grooved wear5If pinion nut corners are worn or damaged, replace the pinion nut
Shift cam 1Check the shift plunger contact surface for wear2Check the O-ring and shift rod boot for wear and scratches1Dial gauge Propeller shaft
3V block
2Check the contact surfaces of propeller
shaft with oil seals for grooved wear
Gear case 1Check the painted surfaces for flaking
3Check the propeller shaft splines for 4wearCheck the clutch dog and splines for wearCheck the compression spring for fatigue, and check the plunger for wearCheck the propeller blades and splines for wear and scratchesCheck the propeller nut (castle type) for damage on threads