Yanmar 4LHA-HTP Operation Manual page 53

(2) Replacing Engine Lube Oil and Lube Oil filter. (See 5.2.1(1))
^3) Replacing Cooling Fresh Water
Cooling performance drops when the cooling water is contaminated with rust and scale.
Even if LLC is added, the cooiing water must be periodically replaced because the properties of
the agent will degenerate. Replace the cooling water periodically.
• Draining the Cooling Fresh Water
• Supplying Cooling Fresh Water
(4) Inspecting and Replacing Anti-
Inspect and replace the anti-corrosive zinc
periodically.
©Close the kingston cock.
©Drain the cooling seawater.
After draining, close the cocks.
©Remove the plug labeled ZINC and indicat-
ed in the diagram.
. Anti-corrosive zinc is on the following parts.
Part
Parts No.
Intercooler
119574-18790
Engine oil cooler
119574-44150
* Fresh water cooler 119574-44150
* : For 4LHA-DTP/-DTZP/-STP/-STZP
©Check the zinc on the inside of the plug to
determine ihe amount of wear to ihe anti-corrosive zinc.
• Replace the anti-corrosive zinc when it has been reduced to less than 1/2 of its original size.
• If there is only a little bit of wear, clean the surface by sanding off any corroded areas.
'©Replace plug.
©Open the kingston cock and check water leakage.
Intercooler Lube oil cooler
— See 4.9.1.
— See 3.5.
Corrosive Zinc
-* See 4.9.1
Quantity Dimensions DXL
1 V2"XV
2 U2'XV
2 1/2"X2"
Zinc
- 4 9 -
[NOTICE]-
If replacement of zinc is neglected
and operation is continued with a
small volume of anti-corrosive zinc,
corrosion of the seawater cooling
system will occur and water leak-
age, parts breakage, or accidents
will result.
Anti-corrosive zinc label
Fresh water cooler
i
Zinc
Anti-corrosion plug
^ ^
i