90-824052R3 JUNE 2002 LOWER UNIT - 6C-17
Forward Gear and Bearings
REMOVAL AND DISASSEMBLY
NOTE: Forward gear can only be removed from gear
housing after driveshaft and pinion gear have been
removed.
1. Reach into gear housing and lift out forward gear.
IMPORTANT: DO NOT remove tapered bearing or
needle bearing from forward gear, unless
replacement of bearings is required. (Bearings
cannot be reused after they have been removed.)
2. If inspection determines that replacement of
forward gear tapered bearing is required (Refer
to “Cleaning and Inspection”, following),
remove bearing from gear housing (tapered
bearing MUST BE replaced as a set), as follows:
a. Install Universal Puller Plate (91-37241)
between forward gear and tapered bearing.
b. Place forward gear, bearing and puller plate
on a press and press gear out of bearing with
a suitable mandrel.
a
51870
b
a - Universal Puller Plate
b - Mandrel
c. Use Slide Hammer (91-34569A1) to remove
forward gear tapered bearing race.
d. After forward gear tapered bearing race is
removed from gear housing, lift out and retain
shim(s) which were behind bearing race.
a
b
51865
a - Slide Hammer
b - Tapered Bearing Race
3. If inspection determines that replacement of
propeller shaft needle bearing in forward gear is
required (refer to “Cleaning and Inspection”,
following), remove bearing from gear, as follows:
a. Clamp forward gear securely in soft jaw vise.
b. From tooth-side of gear, drive propeller shaft
needle bearing out of gear with a punch-and-
hammer.
CLEANING AND INSPECTION
1. Clean driveshaft, tapered bearing and race, and
pinion gear with solvent. Dry with compressed
air.
CAUTION
DO NOT spin bearings dry with compressed air,
as this could cause bearings to score.
2. Inspect gear teeth for pitting, grooves, scoring,
uneven wear and discoloration from overheating.
Replace gear, if any of these conditions are
found.
3. Check clutch jaws on forward gear for damage.
Replace forward gear, if damage is found.
4. Inspect tapered bearing race for pitting, grooves,
scoring, uneven wear and discoloration from
overheating. Replace tapered bearing (on
forward gear) and race, if any of these conditions
are found. (Always replace tapered bearings as
a set.)
5. To determine condition of propeller shaft needle
bearing (in forward gear), inspect propeller shaft
forward gear needle bearing surface, as outlined
in “Propeller Shaft Inspection”, preceding.