TOHATSU NB-1000 Service Manual page 174

SECTION 6
Cleaning and Inspection
All worn, damaged, and missing paIls must be replaced.
1. Discard the clutch pin snap spring and all seals and o-rings that
have been removed.
2. Clean all gearcase components with solvent and dry with low pressure
compressed air. After cleaning, apply specified gear oil to aII internal
components to prevent rusting.
3. Perform the following inspections:
Gearcase Housing
• Inspect internal and external surfaces of housing for cracks and
other damage. AIl threaded holes must be undamaged and free
of corrosion and sealing agents.
• Checkthe sacrificial trim tab ford amage and erosion. See
Anodes - Inspection and Testing in Section 2.
• Inspect the water intake screens for damage and blockage. lf
screens cannot be fully cleaned, replace them.
Propeller and Shaft
• Verify the propeller is true and free of nicks, chips, and other
damage that will affect performance. Inspect the thrust washer
and mounting hardware for damage.
• Check the propeller shaft threads and splines for wear and damage.
Propeller Shaft Housing
Examine propeller shaft housing and components for wear,
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damage, and deterioration. lf necessary, disassemble and
repair as needed. See Gearcase Repair Procedures, this section.
Driveshaft
• Check driveshaft threads and splines for wear, chips, and cracks.
Severe spline wear or the appearance of spline "twisting"
indicates the gearcase or exhaust housing has been distorted,
possibly by impact damage.
• Bearing(s) must be free of damage, corrosion, and discoloration.
Replace bearing(s)
Procedures, this section.
All Internal Components
Inspect aIl internal components for signs of wear, chipping, pitting,
distortion, and discoloration due to improper lubrication. Special
attention to the following:
• Check the bevel gear A tapered roller bearing outer race. lf
damaged or corroded, replace both the race and the bearing.
See Gearcase Repair Procedures in this section.
• Inspect clutch and gear teeth and the clutch cam for chips and
signs of metal transfer. Replace parts as needed.
6-22
NOTE
as required. See Gearcase
18
Repair
1-/ 2-Cylinder