DETROIT DIESEL 53
SPECIFICATIONS 1.0
ENGINE PARTS (Standard size, New )
MINIMUM
MAXIMUM
LIMITS
Pistons and Rings
Piston:
Diameter (at skirt):
Non-turbocharged engines ............................................. 3.8699"
3.8721"
Clearance--piston skirt-to-liner:
Non-turbocharged engines ............................................. .0031"
.0068:"
.0100"
Out-of- ..................................................................................
.0005"
Taper....................................................................................
.0005"
Inside diameter--piston pin bushing....................................... 1.3775"
1.3780"
Compression rings:
Gap (chrome ring) .......................................................... .0200"
.0460"
.0600"
Gap (cast iron ring)............................................................... .200"
..0360"
.0600"
Clearance-- ring-to-groove:
Top (No 1) .................................................................... .0030"
.0060"
.0120"
No ................................................................................ .0070"
.0100"
.0140"
No 3 and ...................................................................... .0050"
.0080"
.0130"
No 3 and 4 (21:1 ratio piston) ....................................... .0045"
.0070"
.0120"
Oil control rings:
Gap ................................................................................ .0100"
.0250"
.0440"
Clearance--ring-to-groove............................................... 0015"
.0055"
.0080"
Piston Pins
Diameter .............................................................................. 1.3746"
1.3750"
Clearance--pin-to-piston bushing ......................................... .0025"
.0034"
.0100"
Clearance--pin-to-conn rod bushing .................................... .0010"
.0019"
.0100"
Connecting Rod
Length--center-to-center ...................................................... 8.7990"
8.8010"
Inside diameter (upper bushing)............................................ 1.3760"
1.3765"
Normal side clearance (in-line engine ................................... .0060"
.0120"
Crankshaft
Journal diameter--main bearing (in-line engine) .................... 2.9990"
3.0000"
Journal diameter--conn rod bearing (in-line engine .............. 2.4990"
2.5000"
Journal out-of-round ........................................................... .00025"
Journal taper ....................................................................... .0005"
.0030"
Runout on journals--total indicator reading:
3
cyl in-line engine ................................................... .0020"
Runout tolerance given for guidance when regrinding crankshaft
Crankshaft for 3-53 supported on No 1 and No 4 journals; runout measured at No 2 and No 3 journals
When the runout on adjacent journals is in the opposite direction, the sum must not exceed .003" total indicator reading
When in the same direction, the difference must not exceed .003" total indicator reading. When high spots of 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.
April, 1974
SEC. 1.0
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