Mercury MerCruiser 496 CID 8.1L Gasoline Marine Engines Service Manual Number 30

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.
75747
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
Product Specification
CategoriesMercury MerCruiser Manuals
Tags
Model Year1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Download File
Please Enter the Security Characters Shown Below. Letters are Case Sensitive. Your download link will appear upon completing this step.
- 355 pages
Document File TypePDF
CopyrightAttribution Non-commercial
(2 votes, average: 4 out of 4)
Marine readers have rated Mercury MerCruiser 496 CID 8.1L Gasoline Marine Engines Service Manual Number 30 4.0 out of 4.0 based on 2 product reviews.
Submit your review (optional)
(will not be displayed)
* Required Field

Mercury MerCruiser 496 CID 8.1L Gasoline Marine Engines Service Manual Number 30 SKU UPC Model
Sven-Erik Walin on Jun 10, 2018. crankcase ventilation

How many openings for crankcaseventilation is there on
Merc 496 HO ?


John fox on Apr 11, 2018. Manual

Great down load . it was all there an more


Leave a Reply

Your email address will not be published. Required fields are marked *

*
*
Website