6C-18 - LOWER UNIT 90-824052R3 JUNE 2002
Shift Shaft, Bushing and Cam
SHIFT SHAFT REMOVAL
NOTE: The propeller shaft, driveshaft and forward
gear assembly must be removed before removal of
shift shaft and shift cam.
1. Use Shift Shaft Bushing Tool (91-31107) to
unthread shift shaft bushing, then lift shift shaft
bushing off shift shaft.
a
51800
a - Shift Shaft Bushing Tool (91-31107)
2. After bushing is removed, lift shift shaft out of
gear housing.
3. Once shift shaft is removed, the shift cam is free
and can be removed from propeller shaft cavity.
SHIFT SHAFT, BUSHING, CAM CLEANING AND
INSPECTION
1. Clean all parts (shift shaft, bushing and cam) with
solvent and dry with compressed air.
2. Inspect shift cam for wear on shift ramps.
3. Inspect shift shaft for grooves at shift shaft
bushing seal surface. Also check for wear and/or
corrosion damage on upper and lower splines.
4. Inspect shift shaft bushing for corrosion damage.
5. Inspect shift shaft bushing oil seal for wear or
cuts.
NOTE: If shift shaft bushing is equipped with 2 oil
seals, and seals need to be replaced, order a new
shift shaft bushing assembly. Seals in a 2 seal shift
shaft bushing assembly are not replaceable.
6. Check “E” clip (if equipped) for damage. Replace
clip if damaged.
SHIFT SHAFT AND BUSHING DISASSEMBLY
1. Remove (and discard) O-ring from shift shaft
bushing.
2. Remove (and discard) oil seal by prying out or
driving it out with a punch and hammer.
3. Remove (and discard) “E” ring, (if equipped) if
inspection determines that replacement is
required.
Gear Housing
CLEANING AND INSPECTION
1. Clean gear housing with solvent and dry with
compressed air.
2. Check gear housing carefully for impact damage.
3. Check for loose fitting bearing cups and needle
bearings.
4. Inspect bearing carrier cover nut retainer threads
in gear housing for corrosion damage and/or
stripped threads.
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