Yanmar 3JH4E, Service Manual

Page: 82 / 350

2. Inspection and adjustment
62
(3) Replace the marine gear lube oil and the
lube oil filter.
During initial operation, the oil is quickly
contaminated due to the initial wear of internal
parts. The lube 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) Remove the marine gear lube oil filter (only
for KMH4A) and wash the lube oil filter.
a) Remove the side cover and then remove
the filter inside the cover.
b) Clean the filter thoroughly with kerosene.
c) Hold the filter in place with the coil spring
and insert them into the case. Fit an O-ring
to the side cover and reattach the side
cover. Tighten the side cover bolts.
3) Fill with new lube oil. Refer to 2.2.1(3) for the
standard of the marine gear lube oil capacity.
4) 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.
• "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.
For used V-belt 8-10 mm (0.315-0.393 inches)
For new V-belt 6-8 mm (0.236-0.315 inches)
Filter
Coil spring
O-ring
Side
cover
Lube oil filter
KMH4A
008416-02E
Push
008436-01E