ENGINE PARTS (Standard Size, New)
MINIMUM
MAXIMUM
LIMITS
Cross-Head Pistons and Rings
Piston crown:
Saddle-to-crown distance: ..............................................
2.6730 "
2.6800 "
Diameter:
At top ...........................................................................
4.2226
"
4.2256
"
Below both compression rings ...................................
4.2391
"
4.2421
"
Above and below seal ring groove ............................
3.8850
"
3.8950
"
Above and below bearing saddle ...............................
3.2360
"
3.2370
"
Compression rings:
Gap (top-fire ring) ............................................................
.0230 "
.0380 "
.0600 "
Gap (No. 2 and 3) ..............................................
.0180 "
0430 "
.0600 "
Clearance--ring-to-groove:
*Top (Keystone fire ring) ............................................
.0010 "
.0070 "
.0050 "
No. 2 (rectangular section) ................................
.0100 "
.0130 "
.0220 "
No. 3 (rectangular section) .......................................
.0040 "
.0070 "
.0130 "
Seal ring:
Gap (in skirt counterbore) ..............................................
.0020 "
.0210 "
.0270 "
Clearance .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
.0005 "
.0030 "
.0040 "
Piston skirt:
†Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2428
"
4.2450
"
Clearance--skirt-to-liner ....................................................
.0083
"
.0045
"
.0120 "
Seal ring bore ..................................................................
3.9200
"
3.9240
"
3.9260 "
Piston pin bore .....................................................
1.5000
"
1.5030
"
1.5040 "
Oil control rings:
Gap (two rings in lower groove) .....................................
.0080
"
.0230
"
.0430
"
Gap (one ring in upper groove) ....................................
.0050
"
.0140
"
.0340
"
Gap (two rings in upper groove) ...................................
.0080
"
.0230
"
.0430
"
Clearance (lower groove) ...............................................
.0015
"
.0055
"
.0080
"
Clearance (upper groove) ................................................
.0010
"
.0035
"
.0060
"
Piston Pins
Length. . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6150 "
3.6250 "
Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4996 "
1.5000 "
1.4980 "
Slipper bearing (bushing):
Thickness at center .......................................................
.0870 "
.0880 "
.0860 "
Clearance (edge of bushing to groove in piston) ..............
.0005 "
.0105 "
.0120 "
Crankshaft
3.5000 "
Journal diameter--main bearing ...........................................
3.4990 "
Journal diameter..conn. rod bearing ....................................
2.7490 "
2.7500 "
Journal out-of-round ...................................................
.0010 "
.00025 "
Journal taper
............................................................
.0015 "
.0005 "
Runout on journals--total indicator reading:
4 cylinder (mounted on No. 1 and No. 5 journals):
.0020
"
At No. 2 and No. 4 journals ........................................
.0040
"
At No. 3 journal ............................................................
Thrust washer thickness .......................................................
.1190 "
.1220
"
End play (end thrust clearance) ...........................................
.0110
"
.0180 "
.0040 "
*Measured with Keystone fire ring flush with outside diameter of piston crown.
† Diameter above and below the piston pin may be 4.2414".
Runout tolerance given for guidance when regrinding crankshaft. When the runout on adjacent journals is in the opposite
direction, the sum must not exceed .003" total indicator reading. When the runout on adjacent journals is in the same
direction, the difference must not exceed .003" total indicator reading. When high spots of the runout on adjacent
journals are at right angles to each other, the sum must not exceed .004" total indicator reading or .002" on each
journal.
11B-125
