1.0 Specifications
DETROIT DIESEL 53
STANDARD BOLT AND NUT TORQUE SPECIFICATIONS
THREAD
THREAD
TORQUE
TORQUE
SIZE
(Ib.ft)
SIZE
(lb-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
137-147
5/8 -11
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
TORQUE
THREAD
SIZE
(lb-ft)
Injector control shaft bracket bolts
1/4 -20
10-12
Cam follower guide bolts
12-15
1/4 -20
Governor to flywheel housing bolts
10-12
5/16-18
Idler gear hub and spacer bolts
19-23
5/16-18
Oil pan bolts
10-12
5/16-18
Idler gear hub and spacer bolts
40-45
3/8 -16
Injector clamp bolts
20-25
3/8 -16
Air box cover bolts (in-line engine)
12-16
3/8 -16
Flywheel housing bolts
25-30
3/8 -16
Flywheel housing bolts
25-30
3/8 -24
Connecting rod nuts (in-line
engine)
40-45
3/8 -24
Fuel line nuts
12-15
3/8 -24
Fuel connector
20-28
3/8 -24
Rocker arm bracket bolts
50-55
7/16.14
*Flywheel bolts
110-120
1/2 -20
*Main bearing cap bolts
9/16-12
120-130
*Cylinder head bolts
170-180
5/8
-11
Flange mounted air compressor drive shaft nut
3/4
-10
Crankshaft end bolt (in-line
.290-300
engine)
3/4
-16
Air compressor drive pulley nut
80-100
3/4
-16
Crankshaft end bolt (engines with cone mounted pulley
stamped with letter "A"
200-220
-14
Camshaft and balance shaft nut
.300-325
1.1/8 -18
*Lubricate at assembly with international Compound No. 2. or equivalent (refer to Parts Catalog or Microfiche. Section 12.8000A)
100 Ib.ft plus increase torque to line-up cotter pin.
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