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 Wear limits
Sizes and fits
Field
Fig.
Depot
Ref.
maint
maint
Point of measurement
of new parts
No.
letter
Ss
0.0050
0.0250 to O. Q350
0.0450
Gap clearance of two top compression
rings when fitted in gage.
(2) Piston ring (groove 3).
0.0905
0.0925 to 0.0935
0.0920
FF
Width of No. 3 compression ring -----
0.1010
0.0970 to 0.0980
0.0990
NN
Width of No. 3 compression ring
groove in piston.
0.0065L 0.0065L
FF-NN
0.0035L to 0.0055L
Clearance between No. 3 ring and ring
land of piston.
0.0250 to 0.0350
0.0500
RR
0.0450
Gap clearance of No. 3 compression
ring when fitted in gage.
(3) Oil control ring.
0.1855 to 0.1865
0.1850
GG
0.1850
Width of oil control ring ------------
0.1910
0.1880 to 0.1890
MM
0.1900
Width of oil control ring groove in
piston.
0.0015L to 0.0035L
0.0050L 0.0045L
GO-MM Fit of oil control ring in piston ------
0.0130 to 0.0280
0.0430
0.0380
Gap clearance of oil control ring when
QQ
fitted in gage.
e. Connecting Rods.
(1) Piston pin end.
1.6265 to 1.6267
1.6277
BB
1.6272
Inside diameter of bushing-type bear-
ing.
1.6247 to 1.6249
1.6243
1.6245
JJ
Outside diameter of piston pin -------
0. 0016L to 0.0020L
BB-JJ
Fit of pin in bushing-type bearing ----
0.0030L 0.0025L
CC
Outside diameter of piston pin bush-
ing-type bearing. (Press fit in bore
dimension DD below).
1.7490 to 1.7500
DD
Inside diameter of bearing bore in
connecting rod.
(2) Connecting rod journals and sleeve bearings (standard),
WW
3.2510 to 3.2520
Inside diameter of sleeve bearing bore
in rod.
xx
Thickness of connecting rod sleeve
0.1249 to 0.1254
0.1239
0.1245
bearing.
3.0020 to 3.0022
3.0042
3.0032
YY
Inside diameter of sleeve bearing at
proper torque tightness.
2.9960 to 2.9970
2.9945
2.9950
AD
Outside diameter of connecting rod
journal.
YY-AD
Theoretical oil clearance between
0.0050L to 0.0062L
0.0082L 0.0070L
connecting rod sleeve bearing and
crankshaft connecting rod journal.
335
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