Yanmar 1GM User Manual page 131

MULTICYLINDER ENGINES
125
11. Carefu lly lift the cran kshaft out of the engine (Figure
65).
12. Proceed as follows to replace the crankshaft seal in
the main bear ing housing:
a. Pry the old seal from the mai n bearing hous ing with
a large screwdriver. Work ca refully to prevent dam -
age to the main bearing housing seal surface.
b. Clean the seal recess in the housing with solvent
and blow it dry with compressed air.
c. Apply gasket sealer to the periphery of the seal.
d. Posi tion the new sea l in the housing recess with its
open end facin g the inside of the bea ring housing.
Drive the seal into place with a suitably sized seal
driver.
13. Refer to the Main Bearings section for information
concerning service to the main bearings and thrust bear-
ings.
14. Reinstall the crankshaft by reversing the removal
procedure whi le noting the followi ng:
a. Thoroughly lubricate the main bearings and thrust
bearings.
b. Be sure to install a new O -ring on the main bearing
housing .
c . Tighten the main bearing and inte rmediate hous ing
bo lts to the tigh tening torque specified in Ta ble 4.
After tigh tening, rotate the crankshaft to be sure it
rotates freely .
If not, loosen, then
retig hten the inter-
mediate ma in bearing housing bolts.
-
6
•
•
•
•
•
•
@
Sis;,>
•
(,,,
•
r>.