General Service Recommendations; Bearings; Seals - Mercury 40 Service Manual

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 attempt-
ing any repairs.
In many cases, disassembly of a sub-assembly may
not be necessary until cleaning and inspection re-
veals 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 other-
wise 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 bear-
ings.
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 compressed air.
Air should be directed at the bearing so that it passes
through the bearing. DO NOT spin bearing with com-
pressed 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 bear-
ing race side wear. Work inner bearing race in-and-
out, while holding outer race, to check for side wear.
When inspecting tapered bearings, determine condi-
tion 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.
6A-8 - LOWER UNIT
Roller bearing condition is determined by inspecting
the surface of the shaft that the roller bearing sup-
ports. Check shaft surface for pitting scoring, groov-
ing, imbedded particles, uneven wear and/or discol-
oration 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 appearance. 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.
90-852572R1 JANUARY 1998