Returning The Engine To Service - Yanmar 4JH45 Operation Manual

12/05
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.
If seawater is left inside, it may freeze and
damage parts of the cooling system (heat
exchanger, seawater pump, etc.) when
ambient temperature is below 32°F (0°C).
1. Open the seawater drain cock on the
marine gear cooler (if equipped). Allow
to drain. Open the seawater drain cock
on the air cooler (4JH80, 4JH110 only)
and drain. If no water drains, use a stiff
brush to remove any debris.
2. Remove four bolts attaching the side
cover of the seawater pump. Remove
the cover and drain the seawater.
3. Install cover and tighten bolts.
4. Close all the drain cocks.
JH Series Operation Manual
LONG-TERM STORAGE
RETURNING THE ENGINE
TO SERVICE
1. Replace the oil and the oil filter before
running the engine.
2. Supply fuel if the fuel in the fuel tank
was removed, and prime the fuel
system.
3. Confirm that there is engine coolant in
the engine.
4. Operate the engine at idle speed for 1
minute.
5. Check fluid levels and check engine for
leaks.
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