SERVICE MANUAL NUMBER 25
262 CID (4.3L) ENGINES
IMPORTANT: Excessive valve stem to bore clearance will cause excessive oil
consumption and possible valve breakage. Insufficient clearance will result in noisy
and sticky valves.
4.
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.
c. If clearance exceeds specifications, it will be necessary to ream valve guides for
oversized valves, as outlined under “Valve Guide Bore Repair.”
b
c
a
72336
a - Valve Stem
b - Dial Indicator
c - Valve Guide
Valve Guide Bore Repair
IMPORTANT: Be sure to measure valve stem diameter of both the intake and exhaust
valve, as valve stem diameter may or may not be the same for both valves.
If .015 in. oversize valves are required, ream valve guide bores for oversize valves, as
follows:
1.
2.
Measure valve stem diameter of old valve being replaced and select proper size valve
guide reamer from chart below.
Standard Valve Stem Diameter
Reamer Required for .015 in. Oversize Valve
.341
in.
J-5830-2
Ream valve guide bores, as shown.
72886
3.
Remove the sharp corner created by reamer at top of valve guide.
Index
90-861328--1
NOVEMBER 1999
Page 3A-49
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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