SERVICE MANUAL NUMBER 23
CLOSED COOLED (FRESH WATER) MODELS
Seawater Section
Cooling efficiency of an engine with closed cooling is greatly dependent upon heat transfer
through the tubes within the heat exchanger. During engine operation, contaminants within
the seawater (such as salt, silt, lime, etc.) collect on the inside of the tubes, thus reducing
heat transfer and greatly decreasing heat exchanger efficiency. It is, therefore, recom-
mended that the seawater section of the heat exchanger be cleaned at least once every two
years or whenever decreased cooling efficiency is suspected, as follows:
1.
Remove bolts which secure end plates to each end of heat exchanger, then remove end
plates, seal washers and gaskets. Discard seal washers and gaskets. Clean gasket
material from end plates and heat exchanger.
a
b
c
d
71515
a - Heat Exchanger
b - Sealing Washer
c - End Cap
d - Gasket
2.
3.
Clean water passages in heat exchanger by inserting a suitable size wire brush into
each passage. Use compressed air to blow loose particles out of water passages.
Apply Quicksilver Perfect Seal to both sides of new end plate gaskets, then reinstall end
plates, using new gaskets and seal washers. (Be sure to install seal washers between
end plates and gaskets.) Torque end plate bolts to specifications.
CAUTION
Avoid seawater pickup pump impeller damage. DO NOT operate engine without
water being supplied to seawater pickup pump.
4.
With boat in the water and/or cooling water properly supplied to seawater pickup pump,
start engine and inspect for leaks.
90-861326--1
MARCH 1999
Page 6B-15
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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