PERIODIC MAINTENANCE
4-14
6LPA Service Manual
Periodic Maintenance Procedures
© 2007 Yanmar Marine International
Checking or Replacing Zinc Anodes
Inspect and replace the zinc anodes periodically.
NOTICE: If zinc anodes are not replaced
periodically, corrosion and engine damage will
result.
1. Close the seacock.
2. Drain the seawater cooling system. See
Draining Seawater Cooling System on
page 3-26.
Figure 4-7
Figure 4-7
3. Remove all the plugs labeled ZINC
(Figure 4-7, (1)).
• Fuel Cooler (Figure 4-8, (1))
• Freshwater Cooler (Figure 4-9, (4))
• Intercooler (Figure 4-11, (2)) and
(Figure 4-12, (2))
• Engine Oil Cooler (Figure 4-11, (3))
4. Measure the remaining zinc in the plug.
Replace the zinc anode when it is less than
one-half its original size. See chart for sizes.
Note: Some marine drives have additional zinc
anodes. Check the manufacturer's
documentation for location and other
information.
5. Install a new zinc in a new plug. NOTICE:
NEVER use sealing tape to install the zinc
anode. The anode must make metal-to-metal
contact.
6. Install plug.
7. Open the seacock and check for leaks.
Figure 4-8
Figure 4-8
Figure 4-9
Figure 4-9
Location
Part Number
Qty.
Dimensions D X L
Fuel Cooler
119574-44150
1
12.7 x 25.4 mm
(0.5 x 1.0 in.)
Engine Oil
Cooler
2
Freshwater
Cooler
2
Intercooler
119574-18790
1
(1)
0004
8
96_
s
1
(1)
000491
8
_
s
1
(
3
)
(
3
)
0004919_
s
1