Piston Pin Bushing Replacement; Oil Seal Replacement (Flywheel Housing Side) - Yanmar 3TNV Series Service Manual

3) Apply the honing fluid to the Flex-Hone and turn
the electric drill at 300 to 1200 rpm. Then insert
the Flex-Hone into the cylinder bore while turning
it, and move it up and down for about 30 sec. to
obtain a honing mark with a cross hatch angle of
30 to 40 .
[NOTICE]
1) Avoid faster revolution than 1200 rpm since it
may cause breakdown.
2) Do not insert or extract the Flex-Hone in
stopped state because the cylinder will be
damaged.

4.4.7 Piston pin bushing replacement

Replace bushing by using the special service tool (see 4.1.2 No.3 in Chapter 4).

4.4.8 Oil seal replacement (Flywheel housing side)

1) Replace oil seal, when a flywheel housing is removed. Extract the used oil seal.
2) Insert a new oil seal with the oil seal insertion tool.
3) Apply lithium grease.
4. Disassembly, Inspection and Reassembly of Engines
107