Removal, Disassembly, Cleaning And Inspection Of - Mercury 150 EFI Service Manual

LEFT HAND NON-RATCHETING
BEARINGS
Upon disassembly of gear housing, all bearings must be cleaned and inspected. Clean
bearings with solvent and dry with compressed air. Air should be directed at the bearing
so that it passes thru the bearing. DO NOT spin bearing with compressed air, as this may
cause bearing to score from lack of lubrication. After cleaning, lubricate bearings with
Quicksilver Gear Lubricant. DO NOT lubricate tapered bearing cups until after inspection.
Inspect all bearings for roughness, catches and bearing race side wear. Work inner bear-
ing race in-and-out, while holding outer race, to check for side wear. When inspecting ta-
pered bearings, determine condition of rollers and inner bearing race by inspecting bear-
ing cup for pitting, scoring, grooves, uneven wear, imbedded particles and/or
discoloration from over-heating. Always replace tapered bearing and race as a set.
Roller bearing condition is determined by inspecting the bearing surface of the shaft that
the roller bearing supports. Check shaft surface for pitting, scoring, grooving, imbedded
particles, uneven wear and/or discoloration from overheating. The shaft and bearing must
be replaced, if the conditions described are found.
SHIMS
Keep a record of all shim amounts and location during disassembly to aid in reassembly.
Be sure to follow shimming instructions during reassembly, as gears must be installed to
correct depth and have the correct amount of backlash to avoid noisy operation and pre-
mature gear failure.
SEALS
As a normal procedure, all O-rings and oil seals SHOULD BE REPLACED without regard
to appearance. To prevent leakage around oil seals, apply Loctite 271 to outer diameter
of all metal case oil seals. When using Loctite on seals or threads, surfaces must be clean
and dry. To ease installation, apply 2-4-C with Teflon Marine Lubricant on all O-rings. To
prevent wear, apply 2-4-C with Teflon Marine Lubricant on l.D. of oil seals. To prevent cor-
rosion damage after reassembly, apply Quicksilver 2-4-C with Teflon to external surfaces
of bearing carrier and cover nut threads prior to installation.
Removal, Disassembly, Cleaning and Inspection of Counter
Rotation (Left Hand) Gear Housing
REMOVAL
Disconnect high tension leads from spark plugs and remove spark plugs from
engine before removing gear housing from driveshaft housing.
1. Disconnect high tension leads from spark plugs and remove spark plugs from engine.
Gear housing MUST BE in NEUTRAL position and shift shaft MUST BE removed
from gear housing BEFORE propeller shaft can be removed from gear housing.
2. Shift engine into NEUTRAL position.
3. Tilt engine to full up position and engage tilt lock lever.
4. Bend tabs of propeller tab washer away from thrust hub (rear), then remove propeller
locknut, tab washer, thrust hub (rear), propeller and thrust hub (forward) from propel-
ler shaft.
Page 6B-12
WARNING
CAUTION
90-883728 JULY 2001