Yanmar 3JH4E - Page 68

6. Turn filter an additional 3/4 turn with a
box wrench. Tighten to 20 - 24 N·m
(177 - 212 in.-lb).
7. Fill with new engine oil. See Adding
Engine Oil on page 33. NOTICE:
NEVER mix different types of engine
oil. This may adversely affect the
lubricating properties of the engine oil.
NEVER overfill. Overfilling may result in
white exhaust smoke, engine
overspeed or internal damage.
8. Perform a trial run and check for oil
leaks.
9. Approximately 10 minutes after
stopping the engine, remove the oil
dipstick and check the oil level. Add oil
if the level is too low.
Replace the Marine Gear Oil Filter (If
Equipped) and Change the Marine
Gear Oil
(2)
(3)
(4)
(5)
(1)
0004495
Figure 3
Note: 4JH4-TE / 4JH4-HTE engines with
KMH4A marine gear shown. Refer to the
operation manual of marine gear or sail drive
for procedure.
1. Remove cap from the filler port and
attach an oil drain pump. Drain marine
gear oil.
2. KMH4A Marine Gear: Wash the
marine gear oil filter:
a. Remove side cover
(Figure 3, (5)) and remove the
filter (Figure 3, (2)).
b. Clean the filter thoroughly with
kerosene or clean diesel fuel.
c. Hold the filter in place with the coil
spring (Figure 3, (3)) and insert
into the case. Install a new O-ring
(Figure 3, (4)) in the side cover.
d. Install side cover (Figure 3, (5))
and tighten side cover bolts.
3. Fill marine gear with clean marine gear
oil. See Marine Gear Oil
Specifications on page 34.
4. Perform a trial run and check for oil
leaks.
5. Approximately 10 minutes after
stopping the engine, remove the oil
dipstick and check the oil level. Add oil
if the level is too low.
Checking and Adjusting the
Alternator V-Belt Tension
NOTICE: NEVER get any oil on the belt(s).
Oil on the belt causes slipping and
stretching. Replace the belt if it is damaged.
0004509
(1)
Figure 4
Note: 4JH4-TE shown.
1. Remove the belt cover.
2. Check the belt by pushing on the middle
of the belt (Figure 4, (1)) with your
finger.
With proper tension, the belt should
deflect 8 - 10 mm (approximately
3/8 in.).
3. Loosen the alternator bolt and move the
alternator to adjust the V-belt tension.
PERIODIC MAINTENANCE
62 JH4 Series Operation Manual