Yanmar 3JH4E Service Manual page 100

4. Disassembly and Reassembly
(8) Mounting the gear case flange
Apply the liquid gasket to the gear case flange and mount the gear case flange and lube oil line O-ring
onto the cylinder block.
NOTE:
1) When mounting the gear case flange, match up the two knock pins of the cylinder block.
2) Be sure to coat the O-ring for the cylinder block lube oil line with grease when assembling, so that
it does not get out of place.
(9) Mounting the piston and connecting rod
1) Reassemble the piston and connecting rod.
NOTE:
1) When reassembling the piston and connecting
rod, make sure that the parts are assembled with
the correct orientation.
2) Install each piston ring on the piston, with the
punched manufacturer's mark facing upward.
3) The piston ring joints shall be staggered at by
120° intervals. Do not position the top ring joint
vertical to the piston pin. The coil expander joint
shall be opposite to the oil ring joint.
Make the punched manufacturer's
mark face upward.
Second
ring joint
Expander joint
84
(Piston ring)
Oil ring joint
Top ring joint
(Ring joints)