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1981 4.2L Engine Torque Specifications

Torque Specifications

Service set-to torques should be used when assembling components. In-use recheck torques should be used for checking a pre-torqued item.

USA (ft-lbs)
Metric (N· m)
Description
Service Set-To Torque
Service In-Use Torque
Service Set-To Torque
Service In-Use Recheck Torque
Air Injection Tube-to-Manifold
20
15-20
27
20-27
Air Pump Adjusting Strap-to-Pump
20
15-22
27
20-30
Air Pump Brackets-to-Engine (A/C Compressor or Pedestals)
25
18-28
34
24-38
Air Pump-to-Bracket
20
15-22
27
20-30
Alternator Adjusting Bolt
18
15-20
24
20-27
Alternator Mounting Bracket-to-Engine
28
23-30
38
31-41
Alternator Pivot Bolt or Nut
28
20-35
38
27-47
Alternator Pivot Mounting Bolt-to-Head
33
30-35
45
41-47
Block Heater Nut
20 in-lbs
17-25 in-lbs
2
2-3
Camshaft Sprocket Screw
50
45-55
68
61-75
Carburetor Hold-Down Nuts
14
12-20
19
16-27
Clutch Housing Spacer-to-Block Screws
12
9-15
16
12-20
Clutch Housing-to-Block Screws (bottom)
43
37-47
58
50-64
Clutch Housing-to-Block Screws (top)
27
22-30
37
30-41
Coil Bracket-to-Cylinder Head
14
10-18
19
14-24
Connecting Rod Bolt Nuts
33
30-35
45
41-47
Crankshaft Pulley-to-Damper Bolts
20
15-25
27
20-34
Cylinder Head Capscrews
85
80-90
115
108-122
Cylinder Head Cover Nuts
28 in-lbs
25-31 in-lbs
3.2
2.8-3.5
Distributor Clamp Bracket Screw
13
10-18
18
14-24
EGR Valve
13
9-18
18
12-24
Exhaust Manifold Bolts
23
18-28
31
24-38
Exhaust Pipe-to-Manifold
20
15-25
27
20-34
Fan and Hub Assembly Bolts
18
12-25
24
16-34
Drive Plate-to-Converter Screw
22
20-25
30
27-34
EGR Tube Nuts
30
25-35
41
34-47
Flywheel or Drive Plate-to-Crankshaft
105
95-115
142
129-156
Front Support Bracket-to-Block Screw
35
25-40
47
34-54
Front Support Cushion-to-Bracket
33
27-38
45
36-52
Front Support Cushion-to-Bracket-to-Frame
37
30-45
50
41-61
Fuel Pump Screws
16
13-19
22
18-26
Idler Arm Bracket-to-Sill
50
35-60
68
47-81
Idler Pulley Bracket-to-Front Cover Nut
7
4-9
9
5-12
Idler Pulley Bearing Shaft-to-Bracket Nut
33
28-38
45
38-52
Intake Manifold Coolant Fittings
20
15-25
27
20-34
Intake Manifold Heater Screws
7
5-9
9
7-12
Intake Manifold Screws
23
18-28
31
24-38
Main Bearing Capscrews
80
75-85
108
101-115
Oil Filter Adapter
48
42-55
65
57-75
Oil Pan Drain Plug
30
25-35
41
34-47
Oil Pan Screws - ¼ inch-20
7
5-9
9
7-12
Oil Pan Screws - 5/16 inch-18
11
9-13
15
12-18
Oil Pump Attaching Screws (long)
17
12-20
23
16-27
Oil Pump Attaching Screws (short)
10
8-13
14
11-18
Oil Pump Cover Screws
70 in-lbs
60-80 in-lbs
8
7-9
Oxygen Sensor
35
32-38
48
43-52
Power Steering Pump Adapter Screw
23
18-28
31
24-38
Power Steering Pump Bracket Screw
43
37-47
58
50-64
Power Steering Pump Mounting Screw
28
25-35
38
34-47
Power Steering Pump Pressure Line Nut
38
30-45
52
41-61
Power Steering Pump Pulley Nut
58
40-65
79
54-88
Rear Crossmember-to-Side Sill Nut
30
20-35
41
27-47
Rear Support Bracket-to-Transmission
33
27-38
45
37-52
Rear Support Cushion-to-Bracket
48
40-55
65
54-75
Rear Support Cushion-to-Crossmember
18
12-25
24
16-34
Rocker Arm Assembly-to-Cylinder Head
19
16-26
26
22-35
Spark Plug
11
7-15
15
10-20
Starter to Converter Housing Bolt
18
13-25
24
18-34
Thermostat Housing Screw
13
10-18
18
14-24
Timing Case Cover-to-Block Screws
5
4-8
7
5-11
Timing Case Cover-to-Block Studs
16
13-19
22
18-26
Vibration Damper Screw, Lubricated
80
70-90
108
95-122
Water Pump Screws
13
9-18
18
12-24
All torque values given in foot pounds and newton-meters with dry fits unless otherwise specified.
Source: 1981 Jeep Service Manual

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