Yanmar 3JH4E Service Manual page 34

2. Inspection and Adjustment
3) Moisten the new oil filter gasket with the engine oil and install the new engine oil filter manually
turning it clockwise until it comes into contact with the mounting surface, and tighten it further to 3/4
of a turn with the filter wrench.
Tightening torque: 20-24N•m (177-212 lb-in)
Applicable oil filter Part No.
119305-35150
4) Fill with new lubricating oil.
5) Perform a trial run of the engine and check the oil leakage.
6) Approximately 10 minutes after stopping the engine, check the oil level by using the oil dipstick. Add
oil if the level is too low.
[Notice]
When checking the oil level right after the engine running, the oil level in the dipstick guide decreases
drastically, and the accurate oil measurement can't be performed because the pressure in the cylinder
block decreases with the function of the diaphragm in the rocker arm cover. Therefore, measure the
lube oil level after removing the oil filler cap or about 10 minutes later after stopping the engine.
(3) Replace the marine gear lube oil.
During initial operation, the oil is quickly contaminated due to the initial wear of internal parts. The
lubricating oil must therefore be replaced early.
1) Remove the cap from the filler port and attach the oil drain pump. Drain off the oil.
2) Fill with new lubricating oil.
3) Perform a trial run of the engine and check the oil leakage.
(4) Adjust the tension of the alternator drive belt
When there is not enough tension in the V-belt, it will
slip and the cooling water pump will fail to supply
cooling water. Engine over-heating and the seizure will
occur.
When there is too much tension in the V-belt, the belt
will become damaged more quickly and the bearing of
the cooling water pump may be damaged.
Check and adjust the V-belt tension (deflection) in the
following manner.
[Notice]
Be especially careful not to splash engine oil on the
V-belt, because it will cause slipping, stretching and
aging of the belt.
1) Remove the belt cover. Check the tension of the V-
belt by pressing down on the middle of the belt
with your finger [approx. 98N(10kgf)].
The specified deflection should be as follows.
For used V-belt
For new V-belt
• "New V-belt" refers to a V-belt which has been used less than 5 minutes on a running engine.
• "Used V-belt" refers to a V-belt which has been used on a running engine for 5 minutes or more.
8-10mm (0.315-0.393 inches)
6-8mm (0.236-0.315 inches)
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