Yanmar 4LHA-HTP Operation Manual page 512

Chapter 5 Lubrication System
3. Lube Oil Filter
3-2 Lube oil filter replacement
(1) Period
The paper element will get clogged up with dirt after
long hours of usage, and eventually unfiltered oil will
be fed to the engine through the bypass circuit.
Replace the filter according to the following standard,
as the dirt in unfiltered oil will of course have a
detrimental affect on the engine.
Oil filter replacement period
(2) Replacement
1) Remove the lube oil filter with the special tool.
2) Clean the filter mounting surface on the cylinder block
and mounting screws.
3) Coat the filter rubber packing with lube oil.
4) Screw in the filter until the rubber packing comes in
contact with the mounting surface, and then 2 ~
3 turns more.
5) Run the engine after mounting the filter, and make sure
that there is no oil leakage.
Every 300 hours of
engine operation
5-7
4LHA Se