SERVICE MANUAL NUMBER 30
496 CID (8.1L)
IMPORTANT: Excessive valve stem to bore clearance will cause excessive oil con-
sumption and possible valve breakage. Insufficient clearance will result in noisy and
sticky valves.
5.
Measure valve stem clearance as follows:
a. Attach a dial indicator to cylinder head, positioning it against the valve stem and
close to the valve guide.
b. Holding valve head off seat about 1/16 in. (2 mm), move valve stem back and forth
in direction shown. Compare stem clearance with specifications.
a
c
b
72563
a - Dial Indicator
b - Valve Stem
c - Valve Guide
c. If clearance exceeds specifications, it will be necessary to ream valve guides for
oversized valves.
Valve Springs - Checking Tension
IMPORTANT: Springs should be replaced if not within 10 lb. (44 N) of specified
tension.
b
a
76778
a - Valve Spring Tester (J-9666)
b - Torque Wrench
90-863161 SEPTEMBER 2000
INDEX
Page 3A-33
| 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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Great down load . it was all there an more