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TM 10-3930-669-34
3-2. WEAR LIMITS, FITS, AND TOLERANCES.
Refer to Table 3-1 for wear limits, fits, and tolerances for use throughout this chapter.
Table 3-1. Wear Limits, Fits, and Tolerances
Component
Minimum
Maximum
Intake Valves:
Head Diameter
1.689 in.
1.697 in.
(42.900 mm)
(43.100 mm)
Stem Diameter
0.3128 in.
0.3134 in.
(7.9450 mm)
(7.9600 mm)
Stem-to-guide normal clearance
0.0016 in.
0.0028 in.
(0.0400 mm)
(0.0700 mm)
Stem-to-guide maximum clearance
0.0059 in.
(0.1500 mm)
Seat bore diameter in head nominal
1.7913 in.
1.7923 in.
(45.5000 mm)
(45.5250 mm)
Seat outside diameter
1.7969 in.
1.7976 in.
(45.6400 mm)
(45.6600 mm)
Valve seat width
0.0591 in.
0.0787 in.
(1.5000 mm)
(2.0000 mm)
Seat angle
45°
Valve rim thickness
0.0197 in.
0.0394 in.
(0.7000 mm)
(1.0000 mm)
Valve recessed below cylinder head seating surface
0.2000 in.
0.2205 in.
(5.0800 mm)
(5.6000 mm)
Exhaust Valves:
Head diameter
1.4527 in.
1.4606 in.
(36.9000 mm)
(37.1000 mm)
Stem diameter
0.3118 in.
0.3125 in.
(7.9200 mm)
(7.9400 mm)
Stem-to-guide normal clearance
0.0023 in.
0.0037 in.
(0.0600 mm)
(0.0950 mm)
Stem-to-guide maximum clearance
0.0079 in.
(0.2000 mm)
3-2
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