Yanmar BY Series Service Manual page 58

PERIODIC MAINTENANCE
Replacing the Anodes
There are anodes in the seawater cooling system
and they should be inspected and replaced
periodically.
Anodes are located in the heat exchanger
(Figure 4-8, (1)) and the charge air cooler
(Figure 4-8, (2)). An additional anode may also be
located in the exhaust / water mixing elbow.
Figure 4-8
(2)
(1)
Figure 4-8
1. Disconnect battery negative (-) cable.
2. Remove each anode and inspect for corrosion.
Any anode having less than half its original size
remaining should be replaced. NOTICE:
NEVER use thread sealer or thread sealing
tape when installing anodes. Anodes must
make good metal-to-metal contact to perform
properly.
3. Install each anode using a new copper gasket
and tighten to 25 N·m (18 ft-lb).
4. Start engine and check for water leaks.
Checking or Replacing the Seawater Pump
Impeller
See Seawater Pump on page 7-18.
4-14
Replacing the Turbocharger Heat Shield
Remove bolts and replace the turbocharger heat
shield.
Figure 4-9
Cleaning the Exhaust / Water Mixing Elbow
The mixing elbow is attached to the turbocharger.
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The exhaust gas is mixed with seawater in the
mixing elbow.
1. Clean dirt and scale out of the exhaust gas
2. Repair any cracks or damage to the mixing
3. Inspect the gasket and replace if necessary.
© 2009 Yanmar Marine International
Periodic Maintenance Procedures
Figure 4-9
passage. Clean and clear the seawater
passage in the mixing elbow.
elbow by welding or replacement.
BY Service Manual
( 1 )
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