TM 5-4310-276-14
Table 1-1. Engine Repair and Replacement Standards (Cont'd)
Mfr's
Desired
Maximum
Maximum
dimensions
clearance
allowable
allowable
wear in
and tolerance
in inches
clearance
(cm)
inches (cm)
in
in inches
(cm)
inches (cm)
ZDenotes replacement
Components
necessary if Mfr's
toleances are
Minimum Maximum
Minimum Maximum
exceeded
PISTON (Cont'd)
Skirt o.d. (Cont'd)
2.2500 2.2505
0.0005
D-Bottom
0.0015
2.2495
0.0030
(5.7150) (5.7162)
(0.0038)
(5.7137)
(0.0076)
(0.0127)
Piston ring groove dia
1.9980
2.0080
Top
(5.0749)
(5.1003)
1.9500
1.9600
Second
(4.9530)
(4.9784)
1.9500
19600
Third
(4.9530)
(4.9784)
Piston ring groove width
0.1205
0.1215
Top
0.0020
0.0050
(0.3060)
(0.3086)
(0.0050)
(0.0127)
0.0955
0.0965
0.0015
Second
0.0035
(0.2425)
(0.2451)
(0.0038)
(0.0088)
Third
00010
0.1880
0.1890
0.0030
(0.4775)
(0.4800)
(0.0025)
(0.0076)
Piston rings
Width: spacer
0.0245
0.0235
(0.0596)
(0.0622)
Top
0.0930
0.0940
(0.2362)
(0.2387)
0.0930
0.0940
Second
(0.2362)
(0.2387)
Third
0.1860
0.1870
(0.4724)
(0.4749)
Thickness: Spacer
0.1110
0.1150
(0.2819)
(0.2921)
0.0940
0.1040
Top
(0.2387)
(0.2641)
0.0940
0.1040
Second
(0.2387)
(0.2641)
0.0940
0.1040
Third
(0.2387)
(0.2641)
0.0005
0.0350
Gap clearance spacer
Dia.
Over
1.9820
Plug
(0.0012)
(0.0889)
(5.0342)
0.0070
0.0170
In bore
Top
(0.0177)
(0.0451)
0.0070
0.0170
In bore
Second
(0.0177)
(0.0431)
0.0070
0.0170
In bore
Third
(0.0177)
).0431)
Side clearance
First
00020
0.0050
(0.0050)
(0.0127)
0.0015
0.0035
Second
(0.0038)
(0.0088)
0.0010
0.0030
Third
(0.0025)
(0.0076)
VALVES
Exhaust and intake
Length to gage point
2.7885
2.7935
2.7850
(7.0827)
(7.0954)
(7.0739)
Stem diameter
0.3100
0.3105
0.3095
0.0020
0.0045
0.0030
(0.7874)
(0.7886)
(0.0050)
(0.7861)
(0.0114)
(0.0076)
Head diameter
0.8390
0.8490
(2.1310)
(2.1564)
1-7
