Yanmar 6LPA-STP2 Service Manual page 76

PERIODIC MAINTENANCE
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
(1)
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.
Location Part Number
Fuel Cooler
Engine Oil
Cooler 119574-44150
Freshwater
Cooler
Intercooler 119574-18790
Note: Some marine drives have additional zinc
anodes. Check the manufacturer's
documentation for location and other
information.
4-14
0004896_s1
Qty. Dimensions D X L
1
2
12.7 x 25.4 mm
(0.5 x 1.0 in.)
2
1
© 2007 Yanmar Marine International
Periodic Maintenance Procedures
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
( 1 )
Figure 4-8
Figure 4-9
( 3 )
Figure 4-9
6LPA Service Manual
0004918_s1
( 3 )
0004919_s1