Gaskets, Oil Seals And O-Rings; Lock Washers/Plates And Cotter Pins; Bearings And Oil Seals; Circlips - Yamaha YZ 2019 Series Owner's Service Manual

EAM30011

GASKETS, OIL SEALS AND O-RINGS

1. When overhauling the engine, replace all
gaskets and O-rings. All gasket surfaces, oil
seal lips, and O-rings must be cleaned so that
there may be no dust on them.
2. During assembly, always apply proper oil to
bearings and proper grease to oil seal lips be-
fore installation.
1. Oil
2. Lip
3. Spring
4. Grease
EAM30012
LOCK WASHERS/PLATES AND COTTER
PINS
After removal, replace lock washers/plates "1"
and cotter pins with new ones. After the bolt or
nut has been tightened to specification, firmly
bend the lock tabs along a flat of the bolt or nut.
EAM30013

BEARINGS AND OIL SEALS

Install bearings "1" and oil seals "2" with their
manufacturer's marks or size symbols facing
outward. During installation of an oil seal, make
sure that its main lip faces the oil chamber (the
target to be sealed). Before installation, always
apply a light coat of grease to the oil seal lip.
ECA13300
NOTICE
Do not spin the bearing with compressed air
because this will damage the bearing surfac-
es.
IMPORTANT INFORMATION
EAM30014

CIRCLIPS

When assembling parts, always use new cir-
clips. During installation of a circlip, make sure
that the edge "2" of the circlip "1" is positioned
opposite to the force "3" that the circlip receives.
Install the circlip with its end aligned with the
center of the spline, without opening the circlip
more than necessary.
1-6