General Service Recommendations - Mercury 225 EFI Service Manual

LEFT HAND NON-RATCHETING

General Service Recommendations

There may be more than one way to "disassemble" or "reassemble" a particular part(s),
therefore, it is recommended that the entire procedure be read prior to repair.
IMPORTANT: Read the following before attempting any repairs.
In many cases, disassembly of a sub-assembly may not be necessary until cleaning and
inspection reveals that disassembly is required for replacement of one or more compo-
nents.
Service procedure order in this section is a normal disassembly-reassembly sequence.
It is suggested that the sequence be followed without deviation to assure proper repairs.
When performing partial repairs, follow the instructions to the point where the desired
component can be replaced, then proceed to "reassembly and installation" of that compo-
nent in the reassembly part of this section. Use the "Table of Contents" (on back of section
divider) to find correct page number.
Threaded parts are right hand (RH), unless otherwise indicated.
When holding, pressing or driving is required, use soft metal vise jaw protectors or wood
for protection of parts. Use a suitable mandrel (one that will contact only the bearing race)
when pressing or driving bearings.
Whenever compressed air is used to dry a part, verify that no water is present in air line.
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 Pre-
mium 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 Marine Lubricant with Teflon on all O-rings. To
prevent wear, apply 2-4-C Marine Lubricant with Teflon on l.D. of oil seals. To prevent cor-
rosion damage after reassembly, apply 2-4-C Marine Lubricant with Teflon to external sur-
faces of bearing carrier and cover nut threads prior to installation.
Page 6B-12 90-884294 OCTOBER 2001