Check And Replace Anodes - Yanmar BY Series Service Manual

Repair
12/05
6. Engines having the optional high-rise
exhaust elbow: Open drain cock
(Figure 7-5, (1)) and allow water to drain.
Remove and inspect anode
(Figure 7-5, (2)). NOTICE: NEVER use thread
sealer or thread sealing tape when installing
anodes. Anodes must make good
metal-to-metal contact to perform properly.
Figure 7-5
(2)
(1)
Figure 7-5
7. Inspect condition of anodes and replace as
necessary. See Check and Replace Anodes on
page 7-9.
8. Close all drain cocks.
BY Service Manual

Check and Replace Anodes

There are anodes in the seawater cooling system
and they should be inspected and replaced
periodically. See Periodic Maintenance Schedule
on page 4-5 for the recommended frequency.
Anodes are located in the heat exchanger (Figure
7-6, (2)) and the charge air cooler
(Figure 7-6, (1)).
Figure 7-6
0006640
An anode is also located in the optional high-rise
elbow (Figure 7-6, (3)).
1. Drain cooling system. See Drain and Refill
Seawater Cooling System on page 7-8.
2. Remove each anode and inspect for corrosion.
Any anode having less than half its original size
remaining should be replaced.
3. Install each anode using a new copper gasket.
Tighten to 25 N·m (18 ft-lb). NOTICE: NEVER
use thread sealer or thread sealing tape when
installing anodes. Anodes must make good
metal-to-metal contact to perform properly.
4. Start engine and check for water leaks.
© 2009 Yanmar Marine International
COOLING SYSTEM
(3)
(2)
(1)
Figure 7-6
0006622
7-9