SERVICE MANUAL NUMBER 30
CLOSED COOLING
Thermostat
Removal
NOTE: If coolant flow is restricted or fails to occur, a wire should be repeatedly inserted into
drain holes to ensure that there are no obstructions in passages.
1.
2.
3.
4.
5.
6.
7.
Drain seawater portion of cooling system.
Drain closed cooling system.
Loosen thermostat retainer screws.
Remove heat exchanger.
Remove 2 screws, washers and thermostat retainer.
Remove thermostat.
Remove rubber O-ring from thermostat.
Cleaning And Inspection
1.
2.
3.
Clean thermostat with soapy water.
Inspect O-ring for cuts, scrapes and wear. Replace if necessary.
Inspect thermostat retainer for cuts, grooves and wear that would hinder sealing.
Replace if necessary.
Testing
1.
2.
Clean thermostat in soap and water to remove any deposits or debris.
Inspect thermostat for corrosion or other visible damage.
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3.
4.
If thermostat is suspected of producing insufficient engine temperature, check thermo-
stat for leaks by holding it up to a lighted background. Light leaking around the thermo-
stat valve indicates that thermostat is not closing completely and should be replaced.
(A few leaks at one or two points around the valve perimeter is acceptable.)
Check opening and closing temperature of thermostat (using a tester similar to the one
shown), as follows:
a. Fill tester to within 1 in. (25 mm) of top with tap water. Do not use distilled water.
INDEX
90-863161
SEPTEMBER 2000
Page 6A-11
| 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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