Yanmar 3JH5E Operation Manual page 94

PERIODIC MAINTENANCE
Note: The drain cocks are opened
before shipping from the factory.
Marine gear ZF25A does not
have a drain cock on the clutch
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 42 and Checking and Adding
Coolant on page 43 .
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. See your authorized Yanmar
Marine dealer or distributor.
4. Inspect the gasket and replace if
necessary.
86
Cleaning the Turbocharger (If
Equipped)
Contamination of the turbocharger causes
revolutions to drop and engine output to
fall.
If a significant drop in engine output is
noted (10% or more), clean the
turbocharger.
This should be done only by a trained and
qualified technician. See your authorized
Yanmar Marine dealer or distributor.
Adjusting the Alternator V-Belt
Tension
See Checking and Adjusting the Alternator
V-Belt Tension on page 73.
Checking the Wiring Connectors
See your authorized Yanmar Marine dealer
or distributor.
Tightening All Major Nuts and Bolts
See Tightening Fasteners on page 62 or
see your authorized Yanmar Marine dealer
or distributor.
JH Series Operation Manual