Yanmar 6BY2 - Check and Replace Anodes

COOLING SYSTEM
Repair
12/05
BY Service Manual
7-9
© 2009 Yanmar Marine International
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
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.
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
Figure 7-6
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.
0006640
(1)
(2)
0006622
(1)
(2)
(3)