- 22 -
5-4-4 TAPPET AND CAMSHAFT
Insert the tappets into the crankcase holes first,
and then mount the camshaft.
NOTE : Align the timing mark on the root of the
cam gear with the one on the crank gear. If the
valve timing is wrong, the engine cannot operate
properly or at all.
NOTE : If the intake tappet and exhaust tappet
were assembled opposite each other, the tappet
clearance cannot be kept correctly.
5-4-5 MAIN BEARING COVER
Install the main bearing cover to the crankcase.
NOTE: As the governor gear is mounted on the main bearing cover side, install the main bearing cover
with checking that the governor gear meshes with the cam gear. (See Fig.5-21&22.) If the oil seal needs
to be replaced, press-fit a new oil seal before installing the main bearing cover.
NOTE: When installing the main bearing cover,
apply oil to the bearing and oil seal lip. Wrap the
keyway of crankshaft with polyvinyl tape to avoid
damage to the oil seal lip. Then place the main
bearing cover on.
Check that the crankshaft side clearance is 0
〜
0.2mm; and if not, adjust it with the adjusting
shims.
Fig. 5-22
Fig. 5-20
Fig. 5-21
Fig. 5-23
Timing Mark
Timing Mark
Governor Gear
Pay attention to the engagement of
the governor gear and cam gear
Main Bearing Cover
Adjusting Shim
Polyvinyl tape
Packing
Main Bearing Cover Tightening torque
8-10N
・
m
(80-100kg
・
cm)
(5.8-7.2ft
・
lb)