PERIODIC MAINTENANCE
JH Series Operation Manual
131
Figure 7
4JH80, 4JH110
Figure 23
1 – Turbocharger
2 – Coolant drain cock
(Cylinderblock)
3 – Marine gear oil cooler (KMH4A)
4 – Seawater drain cock
(Marine gear oil cooler)
Figure 8
Figure 24
5 – Coolant pump
6 – Coolant tank (Heat exchanger)
7 – Coolant drain cock
(Coolant tank /Heat exchanger)
8 – Seawater drain cock (Air cooler)
9 – Air cooler
10 – Seawater pump
(Drain from pump cover)
Note: The drain cocks are opened before
shipping from the factory.
Marine gear ZF25A does not have a
drain cock on the marine gear
cooler.
1. Open all coolant drain cocks.
2. Allow to drain completely. Dispose of
waste properly.
3. Close all the drain cocks.
4. Fill coolant tank and reservoir with
appropriate coolant.
See Engine Coolant Specifications on
page 55 and Checking and Adding
Coolant on page 56
.
Cleaning the Intake Silencer (Air
Cleaner) Element
1. Disassemble the intake silencer (air
cleaner).
2. Remove element. Clean element and
housing with a neutral detergent.
3. Dry completely and reassemble.
Cleaning the Exhaust/Water Mixing
Elbow
The mixing elbow is attached to the
turbocharger. The exhaust gas is mixed
with seawater in the mixing elbow.
1. Remove the mixing elbow.
2. Clean dirt and scale out of the exhaust
and seawater passages.
3. If the mixing elbow is damaged, repair
or replace. Consult authorized
YANMAR Marine dealer or distributor.
4. Inspect the gasket and replace if
necessary.
1
2
3
4
056988-02X00
5
6
7
8
10
9
056989-03X00
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