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TM 9-2330-398-24
4-1.
ENGINE ASSEMBLY REPAIR (continued).
Table 4-1. Repair and Replacement Standards (continued)
(All values are in inches unless otherwise specified.)
Manufacture’s Dimensions
and Tolerance
Component
Maximum Allowable
Minimum
Maximum
Wear Limit
PISTON PIN:
Length
2.753
2.758
N/A
Diameter
0.9899
0.9901
0.001
Piston clearance
Thumb push fit
Connecting rod bushing clearance
0.0002
0.0007
0.0008
PISTON RING:
Clearance in groove - top
0.0035
0.0075
0.0100
Clearance in groove - 2nd and 3rd - compression
0.0030
0.0050
0.0080
Clearance in groove - 4th - oil control
0.0020
0.0030
0.0050
Gap
0.0100
0.0200
0.0400
VALVE INTAKE:
Stem diameter
0.3415
0.3410
N/A
Stem guide clearance
0.0025
0.0028
N/A
Stem to rocker arm clearance
Cold 0.009
0.0005
Seat diameter in head
1.361
1.362
N/A
Top of valve recessed below cylinder head deck
0.433
0.439
0.500
Seat width
0.0468
0.0625
N/A
Valve seat angle
45°
N/A
N/A
Valve face angle
42°
N/A
N/A
VALVE EXHAUST:
Stem diameter
0.3415
0.3410
N/A
Stem guide clearance
0.0045
0.005
N/A
Stem to rocker arm clearance
0.007
0.0005
Seat diameter in head
1.361
1.362
N/A
Top of valve recessed below cylinder head deck
0.433
0.439
0.500
Seat width
0.0468
0.0625
N/A
Valve seat angle
45°
N/A
N/A
Valve face angle
45°
N/A
N/A
VALVE GUIDE:
Length
1.7812
Outside diameter
0.4690
0.4695
0.4695
Bore diameter - intake - reamed
0.3425
0.3435
0.003
Bore diameter - exhaust - reamed
0.3445
0.3455
0.003
VALVE LIFTER:
Body diameter
0.8725
0.8730
0.003
Overall length
1.510
1.550
1.500
Lifter bore
0.8755
0.8765
0.008
VALVE SPRINGS - INTAKE AND EXHAUST:
Free length
1.875
N/A
Total coils
5.75
N/A
Length, valve dosed
1.528
N/A
Length, valve open
1.214
N/A
Load, valve closed
45 lb
49 lb
40 lb
Load, valve open
83 lb
93 lb
N/A
* Replacement bearing only.
‚ Ship controlled
4-16
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