Yanmar 3JH4E Service Manual page 99

(5) Mounting the main bearing cap
Coat the lower main bearing metal with engine oil, and
mount it to the main bearing cap.
NOTE:
1) The lower main bearing metal does not have an
oil hole.
2) The base bearing thrust metal is fitted with the oil
groove facing outwards.
1) Coat the flange and the thread of the main bearing
bolts with engine oil, put them on the crankshaft
journal, and tighten the main bearing bolts to the
specified torque.
Tightening torque
Main bearing bolt
NOTE:
1) The main bearing cap should be mounted with
the arrow on the cap pointing towards the
flywheel.
2) Make sure to have the correct cylinder alignment
number.
2) Measure the crankshaft side clearance.
Crankshaft side
clearance
0.140-0.220
3) Make sure that the crankshaft rotates smoothly
and easily.
(6) Mounting the oil seal case and the flywheel
housing
1) Replace the used oil seal with new one. Press fit
the oil seal in the oil seal case, and coat the lip of
the oil seal with engine oil
2) Apply the liquid gasket on the mounting surface of
the oil seal case and mount the oil seal case to the
cylinder block, while matching up with the cylinder
block positioning pins.
NOTE:
Be careful that the liquid gasket does not protrude
onto the oil pan mounting surface.
3) Mount the flywheel housing to the cylinder block,
while matching up with the cylinder block
positioning pins.
(7) Turning the engine over
Stand up the engine on the flywheel housing.
N•m(kgf•m)
96-100 (9.8-10.2)
Standard Limit
0.28
4. Disassembly and Reassembly
Oil hole
Lower
Main bearing cap
F W
mm
(Main bearing cap)
83
Upper main bearing metal
Thrust metal
Groove
Mark
Position number
of reassembling
Flywheel housing
Parallel pin
Oil seal
Oil seal case
Cylinder block