6A – 12 GENERAL ENGINE MECHANICAL
1. Valve Guide Clearance
• Measure the valve stem diameter with a micrometer.
If the valve stem diameter is less than the specified
limit, the valve and the valve guide must be replaced
as a set.
mm (in)
Standard Limit
Inlet
7.946 - 7.961
(0.3128 - 0.3134)
7.880
(0.310.2)
Diameter of
Valve stem
Exhaust
7.921 - 7.936
(0.3118 - 0.3124)
7.850
(0.3091)
• Measure the inside diameter of the valve guide with a
micrometer.
• Subtract the measured outer diameter of the valve
stem from the measured inner diameter of the valve
guide. If the valve exceeds of the valve guide.
If the valve exceeds the specified limit, the valve and
the valve guide must be replaced as a set.
Valve Guide Clearance mm (in)
Standard Limit
Inlet clearance
0.039 - 0.069
(0.0015 - 0.0027)
0.200
(0.0079)
Exhaust clearance
0.064 - 0.096
(0.0025 - 0.0038)
0.250
(0.0098)
6A-12-1.tif
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