1.0 Specifications
DETROIT DIESEL 53
STANDARD BOLT AND NUT TORQUE SPECIFICATIONS
THREAD
TORQUE
THREAD
TORQUE
SIZE
(Ib-ft)
SIZE
(Ib-ft)
1/4 -20 ................................................................ 7-9
9/16-12 ................................................................... 90-100
1/4 -28 .............................................................. 8-10
9/16-18 ..................................................................107-117
5/16-18............................................................ 13-17
5/8 -11...................................................................137-147
5/16-24............................................................ 15-19
5/8 -18...................................................................168-178
3/8 -16 ............................................................ 30-35
3/4 -10...................................................................240-250
3/8 *-24 ........................................................... 35-39
3/4 -16...................................................................290-300
7/16-14............................................................ 46-50
7/8 - 9....................................................................410-420
7/16-20............................................................ 57-61
7/8 -14...................................................................475-485
1/2 -13 ............................................................ 71-75
1- 8........................................................................580-590
1/2 -20 ............................................................ 83-93
1-14.......................................................................685-695
EXCEPTIONS TO STANDARD BOLT AND NUT TORQUE SPECIFICATIONS
APPLICATION
THREAD
TORQUE
SIZE
(Ib-ft)
Injector control shaft bracket bolts ...................................................................... 1/4 -20
................................... 10-12
Cam follower guide bolts .................................................................................... 1/4 -20
................................... 12-15
Governor to flywheel housing bolts.................................................................... 5/16-18
................................... 10-12
Idler gear hub and spacer bolts ......................................................................... 5/16-18
................................... 19-23
Idler gear hub and spacer bolts .......................................................................... 3/8 -16
................................... 40-45
Injector clamp bolt.............................................................................................. 3/8 -16
................................... 20-25
Air box cover bolts (6V engine - 3/8" thick clamp) .............................................. 3/8 -16
................................... 10-15
Flywheel housing bolts ....................................................................................... 3/8 -16
................................... 25-30
Flywheel housing bolts ....................................................................................... 3/8 -24
................................... 25-30
Connecting rod nuts (, V-engine) ....................................................................... 3/8 -24
.....................................4045
Fuel line nuts ..................................................................................................... 3/8 -24
................................... 12-15
Fuel connector ................................................................................................... 3/8 -24
................................... 20-28
Rocker arm bracket bolts .................................................................................. 7/16-14
................................... 50-55
*Flywheel bolts ................................................................................................... 1/2 -20
................................110-120
*Main bearing cap bolts ..................................................................................1/9/16-1 2
................................120-130
*Cylinder head bolts ..............................................................................................5/811
................................170-180
Flange mounted air compressor drive shaft nut ................................................... 3/4-10
..........................................
Crankshaft end bolt ( 6V engine) ........................................................................ 3/4-16
................................290-300
.....................................................................................
Camshaft
nut .................................................. 1-1/8 -18
................................300-325
*Lubricate at assembly with International Compound No. 2, or equivalent.
100 Ib-ft plus increase torque to line-up cotter pin.
1972 General Motors Corp.
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