Engine Assembling And Adjustment; Important Information; Crankshaft Installation - Yamaha YT175J 1982 Service Manual

ENGINE ASSEMBLY AND ADJUST-
MENT
Important information
Gaskets and seals
1. All gaskets and seals should be replaced
when an engine is overhauled. All
gasket surfaces and oil seal lips must be
cleaned.
2. Properly oil all mating parts and bearings
during reassembly.
Circlips
1. All circlips should be inspected carefully
before reassembly. Always replace
piston pin clips after one use. Replace
distorted circlips.
When installing a circlip, make sure that
the sharp edged corner is positioned op-
posite to the thrust it receives. See the
sectional view below.
4
1. Thrust 2. Circlip 3. Shaft 4. Sharp edged corner
Lock washers/ plates and cotter pins
1. All lock washers/ plates and cotter pins
must be replaced when they are remov-
ed. Lock tab(s) should be bent along the
bolt or nut flat(s) after the bolt or nut has
been properly tightened.
LOCK WASHER OR
LOCK PLATE
Bearings and oil seals
3-16
1. Install the bearing(s) and oil seal(s) with
their manufacturer's marks or numbers
facing outward. (In other words, the
stamped letters must be on the side ex-
posed to view.) When installing oil
seal(s), apply a light coating of light-
weight lithium base grease to the seal
lip(s). When installing bearings liberally
oil the bearings.
1. Bearing
Crankshaft installation
After all bearings and seals have been in-
stalled in both crankcase halves, install
crankshaft as follows:
1. Set the crankshaft into left case half and
install crankshaft installing tool.
2. Hold the connecting rod at top dead
center with one hand while turning the
handle of the installing tool with the
other. Operate tool until crankshaft bot-
toms against bearing.
1. Crankshaft installer bolt 3. Crank installer bolt adapter
2. Crankshaft installer pot 4. Spacer