TM 5-4310-276-14
Table 1-1. Engine Repair and Replacement Standards (Cont'd)
Mfr's
Desired
Maximum
Maximum
allowable
clearance
allowable
dimensions
wear in
in inches
clearance
and tolerance
(cm)
in
in inches
inches (cm)
inches (cm)
(cm)
Denotes replacement
Components
necessary if Mfr's
tolerances are
Minmum Maximum
Minimum Maximum
exceeded
VALVES (Cont'd)
Exhaust and intake (Cont'd)
0.9010
0.9110
Head diameter
(2.2885) (2.3139)
4545'
460'
Seal angle
0.0045
0.0020
0.0030
Stem to guide clearance
(0.0114)
(0.0050) (0.0076)
0.0040
0.0070
Cold
Clearance valve to lift
(0.0101) (0.0177)
Minimum edge thickness of valve head relative to
0.0310
seat surface
(0.0787)
VALVE SPRINGS
40
0.8800
0.8800
Length (valve open)
(2.2352) (2.2352)
(18144.)
42
40
46
Pounds load (valve open)
(19051.2)
(18144.)
(20865.5)
1.0950
1.0950
Length (valve closed)
(2.7813) (2.7813)
19
21
18
Pounds load (valve closed)
(8618.4) (9525.6)
(8164.8)
VALVE GUIDE
Exhaust and intake
0.0030
0.0045
0.3125
0.0020
0.3145
0.3125
Inside diameter
(0.0050)
(0.0076)
(0.0114)
(0.7988)
(0.7937) (0.7937)
VALVE SEAT INSERTS
Exhaust and intake
0.005T
0.003T
0.8670
0.8770
Outside diameter
(0.0076)
(0.0127)
(2.2021) (2.2275)
0.7450
0.7500
Inside diameter
(1.8923) (1.9050)
4445'
450'
Seat angle
VALVE TAPPETS
0.0018
0.0025
0.0006
0.4970
0.4974
0.4979
Outside diameter
(0.0063)
(0.0015)
(0.0045)
(1.2623)
(1.2633) (1.2646)
0.0025
0.0006
0.0018
Clearance in guide
(0.0063)
(0.0015) (0.0045)
0.0018
0.4995
0.0025
0.0006
0.4987
0.4992
Tappet guide i.d.
(0.0063)
(0.0015)
(0.0045)
(1.2687)
(1.2666) (1.2679)
Rocker arms
0.6245
0.6255
Rocker arm i.d.
(1.5862) (1.5887)
0.0000
0.0008
0.0013
0.4370
0.4375
0.4380
Rocker shaft o.d.
(0.0000)
(0.0020)
(0.0033)
(1.1099)
(1.1112) (1.1125)
(See
Rocker arm bearing i.d. in rocker arm
below)
CYLINDERS
Bore
Out of round
Taper
N/A
Gear to end cover tolerance
N/A
Gear tooth tolerance o.d.
0.0060
0.0020
0.0040
Timing gear tooth tolerance backlash
(0.0050) (0.0101)
**Used on engine with latest Intake Valve configuration, on earlier models the intake valve in the same as the exhaust valve
dimensions.
1-8
