SERVICE MANUAL NUMBER 30
CLOSED COOLING
Removal
1.
2.
3.
4.
5.
6.
Drain closed cooling system.
Disconnect hose from reservoir at the heat exchanger.
Remove hoses connected to the heat exchanger.
Remove heat exchanger bracket.
Loosen thermostat retainer screws.
Carefully lift heat exchanger from crossover.
Disassembly
1.
2.
Remove bolts which secure end plates to each end of the heat exchanger.
Remove end plates, seal washers and gaskets. Discard seal washers and gaskets.
a
b
c
d
71515
a - Heat Exchanger
b - Sealing Washer
c - End Cap
d - Gasket
Cleaning
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 or lime) collect on the inside of the tubes, thus reducing heat
transfer and greatly decreasing heat exchanger efficiency. It is recommended that the sea-
water section of the heat exchanger be cleaned at least once every two years or whenever
decreased cooling efficiency is suspected.
1.
2.
Clean gasket material from end plates and heat exchanger.
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.
INDEX
90-863161
SEPTEMBER 2000
Page 6A-9
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 496 CID |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(2 votes, average: 4 out of 4)
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