Yanmar 3JH4E Service Manual page 96

4. Disassembly and Reassembly
(31) Removing the gear case flange
1) Remove the gear case flange from the cylinder
block.
2) Remove the O-rings from the lube oil passage.
NOTE
1) When mounting the gear case flange, match up
the two knock pins for cylinder block.
2) Be sure to coat the O-rings for the cylinder block
lube oil passage with grease when assembling,
so that it does not get out of place.
(32) Loosening the main bearing bolts.
Loosen the main bearing bolts. Don't remove them.
(33) Turning the engine over
Turn the engine over, with the cylinder head mounting surface facing down.
NOTE:
Make sure that the cylinder head positioning pins on the cylinder block do not come in contact with the
wood block.
(34) Removing the flywheel housing and oil seal case
Remove the flywheel housing and oil seal case from the cylinder black.
Liquid gasket
O-ring
Knock pin
(Removing gear case flange)
80
Gear case flange