SERVICE MANUAL NUMBER 26
CLOSED COOLED MODELS
Cleaning System
Closed Cooling Section
Closed cooling section of the cooling system should be cleaned at least once every two
years or whenever decreased cooling efficiency is experienced.
A good grade automotive cooling system cleaning solution may be used to remove rust,
scale or other foreign material. Always follow manufacturer’s instructions for the cleaner.
If closed cooling section is extremely dirty, a pressure flushing device may be used to flush
out remaining deposits. Flushing should be done in direction opposite normal coolant flow
to allow water to get behind deposits and force them out. Refer to instructions which accom-
pany flushing device for proper hookup and flushing procedure.
NOTICE
For information and procedures on “Draining And Flushing The Seawater Cooling
System,” and “Cold Weather Or Extended Storage,” refer to SECTION 1B.
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:
IMPORTANT: It may be necessary to remove heat exchanger on some models. If heat
exchanger is removed, be sure to refill closed cooling section with coolant.
1.
Remove seawater drain plug from bottom of heat exchanger and allow water to drain.
After water has drained completely, coat threads of drain plug with Quicksilver Perfect
Seal and reinstall.
Index
90-861329--1
MARCH 1999
Page 6B-15
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 181 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 |
(6 votes, average: 5 out of 5)
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