PERIODIC MAINTENANCE
72 YM Series Operation Manual
Replacing the Seawater Pump
Impeller
The seawater impeller must be replaced
every 1000 hours or every 4 years even if
it is not damaged.
See Checking or Replacing the Seawater
Pump Impeller on page 69.
Cleaning and Checking the
Seawater Passages
After prolonged use, clean the seawater
passages to remove dirt, scale, rust and
other contaminants that collect in the
coolant passages. This can cause poor
engine cooling. Inspect these items:
• Heat Exchanger
• Pressure Cap
Consult authorized Yanmar Marine dealer
or distributor.
Checking the Diaphragm Assembly
Inspect the diaphragm assembly on the
rocker arm cover.
1. Loosen screws and remove diaphragm
assembly.
2. Check for oil and contaminants
between the diaphragm and cover.
If oil and contaminants enter the
diaphragm assembly, the diaphragm will
not operate properly.
3. Inspect the diaphragm rubber and
spring for damage. If necessary,
replace with new ones.
Figure 10
Breather System Components
Figure 11
1 – Diaphragm Cover
2–Spring
3 – Center Plate
4 – Diaphragm
5 – Rocker Arm Cover
6 – Breather Baffle
7 – Baffle Plate
8 – Intake Silencer (air cleaner)
Replacing the Alternator V-ribbed
belt
1. Remove the V-ribbed belt cover.
2. Loosen the V-ribbed belt tension
adjusting bolt of the alternator.
3. Remove the alternator V-ribbed belt.
4. Install a new alternator V-ribbed belt.
5. Adjust the alternator V-ribbed belt
tension. See Checking and Adjusting
the Alternator V-ribbed belt Tension on
page 62.
6. Replace the V-ribbed belt cover.
Adjusting Intake / Exhaust Valve
Clearance
Consult authorized Yanmar Marine dealer
or distributor.
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YM OPM_EN.book 72 ページ ２０１３年６月７日 金曜日 午前１１時１１分
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