Ball Bearing, Needle Bearing, and Oil Seal
Ball and Needle Bearing Replacement
Do not remove the ball or needle bearings unless it
is necessary. Removal may damage them.
Using a press or puller, remove the ball bearing and/or
In the absence of the above mentioned tools, satisfac-
tory results may be obtained by heating the case to ap-
proximately 93°C (200°F) max., and tapping the bearing
in or out.
Do not heat the case with a torch. This will warp the
case. Soak the case in oil and heat the oil.
Using a press and the bearing driver set [A], install the
new ball bearing until it stops at the bottom of its housing.
The new needle bearings must be pressed into the
crankcase so that the end is flush with the end of the
Special Tool - Bearing Driver Set: 57001-1129
Ball and Needle Bearing Wear
Do not remove the bearings for inspection. Re-
moval may damage them.
Check the ball bearings.
Since the ball bearings are made to extremely close toler-
ances, the wear must be judged by feel rather than mea-
surement. Clean each bearing in a high-flash point sol-
vent, dry it (do not spin the bearing while it is dry), and oil
it with engine oil.
Spin [A] the bearing by hand to check its condition.
If the bearing is noisy, does not spin smoothly, or has any
rough spots, replace it.
Check the needle bearings.
The rollers in a needle bearing normally wear very little,
and wear is difficult to measure. Instead of measuring,
inspect the bearing for abrasion, color change, or other
If there is any doubt as to the condition of a needle bear-
ing, replace it.
Oil Seal Inspection
Inspect the oil seals.
Replace it if the lips are misshapen, discolored (indicating
that the rubber has deteriorated), hardened or otherwise