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-round .........................................................................
.0005"
Taper .................................................................................
.0005"
Inside diameter--piston pin bushing .......................................
1.3775"
1.3780"
Compression rings:
Gap (chrome ring).................................................................
.0200.
.0460"
.0600"
Clearance--ring-to-groove:
Top (No. 1) ....................................................................
.0030"
.0060"
.0120"
No. 2 .............................................................................
.0070"
.0100"
.0140"
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 (v-type engine) ........................................
.0080"
.0160"
Crankshaft
Journal diameter--main bearing (V-engine) .................................
3.4990"
3.5000"
Journal diameter--Conn. rod bearing (V-engine) .........................
2.7490"
2.7500"
Journal out-of-round ....................................................................
.00025"
Journal taper ...............................................................................
.0005"
.0030"
Runout on journals--total indicator reading:
Crankshaft for 6V-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.
1972 General Motors Corp.
February, 1972
SEC. 1.0 Page 5
