SERVICE MANUAL NUMBER 26
SEAWATER COOLED MODELS
Thermostat
Removal
1.
2.
3.
4.
Drain water from cylinder block and exhaust manifold.
Disconnect hoses from thermostat cover.
Remove thermostat cover attaching bolts and lockwashers.
Remove thermostat from thermostat housing or cover.
b
a
73572
140
° Thermostat Housing Shown
a - Thermostat Cover
b - Attaching Bolts
Testing
1.
2.
3.
Clean thermostat in soap and water to remove any deposits or debris.
Inspect for corrosion or other visible damage.
If thermostat is suspected of producing insufficient engine temperature, check
thermostat for leakage by holding it up to a lighted background. Light leakage around
the thermostat valve indicates that thermostat is not closing completely and should be
replaced. (A small amount of leakage one or two locations around the valve perimeter
is acceptable.)
4.
Check opening and closing temperature of the thermostat (using a tester similar to one
shown below), as follows:
a. Fill tester to within 1 inch (25 mm) of top with tap water. DO NOT use distilled water.
b. Open thermostat valve and insert nylon string. Position thermostat on string so that
it will be just below water level when suspended, then allow valve to close. Suspend
thermostat in water.
Index
90-861329--1
MARCH 1999
Page 6A-5
| 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)
Marine readers have rated Mercury MerCruiser GM 4 Cylinder 181 cid 3.0L Marine Engines Service Manual Number 26 5.0 out of 5.0 based on 6 product reviews. Thanks for sharing this material. Helps a lot after suffering with bad mechanics. spend too much money and nothing very good
great manual, makes impossible jobs possible. without a manual you can not do the job, a must have.
Great resource. Excellent information provided.
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