Specifications

PERIODIC MAINTENANCE
70 YM Series Operation Manual
Replacing the Coolant
CAUTION
Coolant Hazard.
Wear eye protection and rubber gloves
when you handle engine coolant. If
contact with the eyes or skin should
occur, flush eyes and wash immediately
with clean water.
Replace coolant every year.
Note: If Long Life Coolant (LLC) is
used, replace coolant every 2
years.
Note: The drain cocks are opened
before shipping from the factory.
Close all drain cocks before
filling the system with coolant.
1. Put a pan under the coolant drain
cocks.
2. Open all coolant drain cocks.
3. Allow to drain completely. Dispose of
waste properly.
4. Close all the drain cocks.
5. Fill coolant tank and reservooir with
appropriate coolant. See Engine Oil
Specifications on page 31 and see
Checking and Adding Coolant on page
35 .
Cleaning the Intake Silencer (Air
Cleaner) Element
1. Disassemble the intake silencer (air
cleaner).
2. Remove element (Figure 10, (1)).
Clean element and housing with a
neutral detergent.
3. Dry completely and reassemble.
Figure 9
Figure 10
Cleaning or Replacing the
Exhaust / Water Mixing Elbow
There are two types of mixing elbows, the
L-type and the U-type. The mixing elbow is
attached to the exhaust manifold. 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 it. Consult authorized
Yanmar Marine dealer or distributor.
4. Inspect the gasket and replace if
necessary.
Replace the mixing elbow with a new one
every 500 hours or 2 years, whichever
comes first, even if no damage is found.
Consult authorized Yanmar Marine dealer
or distributor.
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