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TM 10-4320-324-14
6-6. Wear Limits, Fits, and Tolerances.
Refer to Table 6-1 for wear limits, fits, and tolerances for use throughout Section II.
Table 6-1. Wear Limits, Fits, and Tolerances
Component
Minimum
Maximum
Intake Valves:
Head Diameter
1.6890 in.
1.6969 in.
(42.90 mm)
43.10 mm)
Stem Diameter
0.3128 in.
0.3134 in.
(7.945 mm)
(7.960 mm)
Stem-to-guide normal clearance
0.0016 in.
0.0028 in.
(0.04 mm)
(0.07 mm)
Stem-to-guide maximum clearance
0.0059 in.
(0.15 mm)
Seat bore diameter in head-nominal
1.7913 in.
1.7923 in.
(45.50 mm)
(45.525 mm)
Seat outside diameter
1.7969 in.
1.7976 in.
(45.64 mm)
(45.66 mm)
Valve seat width
0.0591 in.
0.0787 in.
(1.50 mm)
(2.0 mm)
Seat angle
45
Valve rim thickness
0.0197 in.
0.0394 in.
(0.50 mm)
(1.00 mm)
Valve recessed below cylinder head deck
0.1999 in.
0.2205 in.
(5.080 mm)
(5.600 mm)
Exhaust Valves:
Head diameter
1.4527 in.
1.4606 in.
(36.90 mm)
(37.10 mm)
Stem diameter
0.3118 in.
0.3125 in.
(7.920 mm)
(7.940 mm)
Stem-to-guide normal clearance
0.0023 in.
0.0037 in.
(0.06 mm)
(0.095 mm)
Stem-to-guide maximum clearance
0.0079 in.
(0.20 mm)
6-2
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