Mercury 40 Service Manual page 465

NON-BIGFOOT GEAR HOUSING
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 components.
Service procedure order in this section is a normal disassembly-reassembly sequence.
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
All bearings must be cleaned and inspected. Clean bearings with solvent and dry with com-
pressed air. Air should be directed at the bearing so that it passes through the bearing. DO
NOT spin bearing with compressed air, as this may cause bearing to score from lack of lu-
brication. After cleaning, lubricate bearings with Quicksilver Gear Lubricant. DO NOT lubri-
cate tapered bearing cups until after inspection.
Inspect all bearings for roughness, binding and bearing race side wear. Work inner bearing
race in-and-out, while holding outer race, to check for side wear. When inspecting tapered
bearings, determine condition of rollers and inner bearing race by inspecting bearing cup
for pitting, scoring, grooves, uneven wear, imbedded particles and/or discoloration from
over-heating. Always replace tapered bearing and race as a set.
Inspect gear housing for bearing races that have spun in their respective bores. If race(s)
have spun, gear housing must be replaced.
Roller bearing condition is determined by inspecting the surface of the shaft that the roller
bearing supports. Check shaft surface for pitting scoring, grooving, imbedded particles, un-
even wear and/or discoloration from overheating. The shaft and bearing must be replaced
if such a condition exists.
Seals
As a normal procedure, all O-rings and oil seals should be replaced without regard to ap-
pearance. To prevent leakage around seals, apply Loctite 271 to outer diameter of all metal
case seals. When using Loctite on seals or threads, surfaces must be clean and dry. Apply
2-4-C w/Teflon on all O-rings and on I.D. of oil seals. Apply 2-4-C w/Teflon to external sur-
faces of bearing carrier.
Page 6A-10 90-828631R3 MARCH 1999