Detroit Diesel Series 149 Torque Specifications

June 9, 2023

Detroit Diesel Series 149 Torque Specifications

Thread Size (in.)
Description
Torque Specifications
lb-ft
N-m
1/4-28
Standard Torque Specification
8-10
11-14
Screw-Inj. Rack Control Lever
2-3
3-4
5/16-18
Standard Torque Specification
13-17
18-23
Bolt-Turbocharger Back Plate Assembly to Center Housing
7-10
9-14
5/16-24
Standard Torque Specification
15-19
20-26
Nut-Lock-Push Rod
15-19
20-26
Nut-Lock Valve Bridge Adj. Screw
20-25
27-34
Bolt-Camshaft Drive Coupling
20-25
27-34
3/8-16
Standard Torque Specification
30-35
41-47
3/8-24
Standard Torque Specification
35-39
47-53
Nut-Water Pump to Front Cover
25-30
34-41
Bolt-Camshaft Drive Coupling
45-50
61-68
Bolt-Fuel Pump Drive Coupling Retainer
50-55
68-75
7/16-14
Standard Torque Specification
46-50
62-68
Bolt-Blower Hold Down
50-55
68-75
Bolt-Injector Hold Down Clamp
46-50
62-68
7/16-20
Standard Torque Specification
57-61
77-83
Nut-Fuel Jumper Line to Injector
18-22
24-30
Nut-Water Pump Shaft (Lock)
40-45
54-61
Bolt-Crankshaft Flange Coupling
70-80
95-108
1/2-13
Nut-Exhaust Manifold Standard
32-38
43-52
Nut-Fuel Manifold Connector
35-40
47-54
Bolt-Fan Blade to Pulley Hub
71-75
96-102
Bolt-Cylinder Block
75-85
102-115
Bolt-Crankshaft and Camshaft Idler Hub Center Bolt
80-90
108-122
Bolt-Camshaft Bearing Cap
90-100
122-136
Bolt-Rocker Arm Shaft
90-100
122-136
1/2-20
Standard Torque Specification
83-93
113-126
Nut-Exhaust Manifold Stud
35-40
47-54
Bolt-Cylinder Block
85-95
115-129
Bolt-Crankshaft Flange Coupling
100-110
136-149
9/16-12
Standard Torque Specification
90-100
122-136
Bolt-Blower Hold Down
75-85
102-115
Bolt-Main Bearing Cap
120-130
163-176
9/16-18
Standard Torque Specification
107-117
145-159
Nut-Crankshaft Bearing Cap
130-140
176-190
Bolt-Cylinder Head
90-100*
122-136
5/8-11
Standard Torque Specification
137-147
186-199
5/8-18
Standard Torque Specification
168-178
228-241
Bolt-Crankshaft Adaptor
175-185
237-251
Bolt-Flywheel (Self Locking)
180-190
244-258
Bolt-Vibration Damper
180-190
244-258
Nut-Raw Water Pump Shaft Retaining
25-30
34-41
Nut-Alternator Pulley
70-80
95-108
Nut-Special Self Locking Nut (10SI Alternator)
40-60
54-81
Bolt-Oil Pick-Up Assembly
20-25
27-34
3/4-10
Nut-Flange Mounted Air Compressor Drive Shaft
70-80
95-108
Bolt-Crankshaft Main Bearing
280-290
380-393
3/4-16
Standard Torque Specification
290-300
393-407
Accessory Drive Pulley Nut
120-140
163-190
3/4-18
Nut, Dipstick Tube
30-35
41-47
7/8-14
Standard Torque Specification
475-485
644-658
1 1/4-7
Bolt-Crankshaft Pulley Retainer
450-500
610-678
1 5/16-18
Nut-Blower Timing Gear
200-250
271-339
2.548-18
Nut-Idler Gear Bearing (Lock)
280-300
380-407
3.137-12
Nut-Camshaft Gear Bearing (Lock)
280-300
380-407
* Follow cross-pattern bolt torquing sequence and multiple stage process leading up to the final torque process. After final torque is achieved, turn each bolt 90 degrees (1/4 turn clock-wise) with a single smooth pull of the wrench.

Detroit Diesel Series 149 Pipe Plug Oil Cooler Torque Specifications

Plug Size (in.)
Description
Torque Specifications
lb-ft
N-m
1 1/16-16
Plug-Oil Cooler Bypass Valve
80-90
108-122
1 1/4-16
Plug-Oil Filter Bypass Valve
95-105
129-142
1 1/2-6
Plug-Oil Filter Bypass Valve
110-130
149-176
2-12
Plug-Oil Filter Bypass
130-150
176-203

Detroit Diesel Series 149 Pipe Plug Torque Specifications

Plug Size (in.)
Description
Torque Specifications
lb-ft
N-m
1/8-27
Plug-Pipe (3/4 Taper)
10-12
14-16
1/4-18
Plug-Pipe (3/4 Taper)
14-16
19-22
1/4-18
Plug-Pipe (7/8 Taper)
14-16
19-22
3/8-18
Plug-Pipe (3/4 Taper)
18-22
24-30
3/8-18
Plug-Pipe (7/8 Taper)
18-22
24-30
1/2-14
Plug-Pipe (3/4 Taper)
23-27
31-37
1/2-14
Plug-Pipe (7/8 Taper)
23-27
31-37
3/4-14
Plug-Pipe (3/4 Taper)
33-37
45-50
3/4-14
Plug-Pipe (7/8 Taper)
33-37
45-50
1-11 1/2
Plug-Pipe (3/4 Taper)
75-85
102-115
1-11 1/2
Plug-Pipe (7/8 Taper)
75-85
102-115
1 1/4-11 1/2
Plug-Pipe (3/4 Taper)
95-105
129-142
1 1/2-11 1/2
Plug-Pipe (3/4 Taper)
110-130
149-176
1 1/2-11 1/2
Plug-Pipe (7/8 Taper)
110-130
149-176

Detroit Diesel Series 149 Stud Specifications

Plug Size (in.)
Description
Torque Specifications
lb-ft
N-m
1/2-13
Stud-Exhaust Manifold
35-40
47-54

A Detroit Diesel 12V149 Generator Needing Some Love
A Detroit Diesel 12V149 Generator Needing Some Love

Parts Catalog for Detroit Diesel 8V149 Non – Turbo


Diesel Pro Power supplies a full range of replacement parts for the Detroit Diesel 8V149 non-turbo engine, covering everything from top-end to bottom-end components. Inventory includes pistons, liners, rings, bearings, and complete overhaul kits, along with cylinder heads, valve train parts, and blower components essential to the 149-series two-stroke design. Cooling system parts such as water pumps, thermostats, and heat-exchanger components are available, as well as fuel injectors, pumps, filters, and fuel lines. Additional offerings include exhaust components, gaskets, seals, hoses, and electrical parts like starters and alternators—supporting reliable service and long-term engine performance.


Parts Catalog for Detroit Diesel 8V149 Turbo


Diesel Pro Power carries an extensive selection of parts for the Detroit Diesel 8V149 turbo engine, supporting full overhauls and ongoing maintenance. Available components include pistons, liners, rings, bearings, and complete rebuild kits, along with cylinder heads, valve train parts, and blower assemblies paired with turbocharger-specific components. Cooling system parts such as raw water pumps, thermostats, and heat-exchanger elements are stocked, as well as injectors, fuel pumps, filters, and fuel lines for dependable fuel delivery. Turbo-related exhaust components, gaskets, seals, hoses, and essential electrical parts like alternators and starters are also offered to maintain peak turbocharged performance.


Parts Catalog for Detroit Diesel 12V149 Non – Turbo


Diesel Pro Power offers a complete selection of parts for the Detroit Diesel 12V149 non-turbo engine, supporting full rebuilds and ongoing maintenance. Available components include pistons, liners, rings, bearings, and complete overhaul kits, along with cylinder heads, valve train parts, and essential blower components for the 149-series two-stroke design. The inventory also covers cooling system parts such as water pumps, thermostats, and heat-exchanger elements, plus injectors, fuel pumps, filters, and fuel lines. Additional offerings include exhaust components, gaskets, seals, hoses, and electrical parts like alternators and starters—ensuring long-term reliability for the 12V149 platform.


Parts Catalog for Detroit Diesel 12V149 Turbo


Diesel Pro Power supplies a wide range of parts for the Detroit Diesel 12V149 turbo engine, engineered to support both routine service and full engine overhauls. Stock includes pistons, liners, rings, bearings, cylinder heads, valve train components, and blower assemblies, paired with turbocharger-specific hardware. The cooling system selection features raw water pumps, thermostats, and heat-exchanger components, while the fuel system lineup includes injectors, fuel pumps, filters, and lines. Turbo-related exhaust parts, gaskets, seals, hoses, and electrical items such as starters and alternators are also available—providing complete coverage to maintain maximum turbocharged performance and engine durability.


Parts Catalog for Detroit Diesel 16V149 Non – Turbo


Diesel Pro Power provides a full inventory of replacement parts for the Detroit Diesel 16V149 non-turbo engine, supporting everything from routine service to complete overhauls. Available components include pistons, liners, rings, bearings, and full rebuild kits, along with cylinder heads, valve train parts, and essential blower components for the 149-series two-stroke design. Additional offerings include raw water pumps, thermostats, heat-exchanger components, injectors, fuel pumps, filters, and fuel lines. Exhaust items, gaskets, seals, hoses, and electrical components such as alternators and starters are also stocked—ensuring dependable long-term performance for the large-frame 16V149 platform.


Parts Catalog for Detroit Diesel 16V149 Turbo

Diesel Pro Power carries an extensive parts selection for the Detroit Diesel 16V149 turbo engine, engineered to support high-output turbocharged operation. Inventory includes pistons, liners, rings, bearings, cylinder heads, valve train components, and blower assemblies matched to turbocharger requirements. Cooling system products include raw water pumps, thermostats, and heat-exchanger elements, while the fuel system lineup offers injectors, fuel pumps, filters, and lines for consistent delivery. Turbo-specific exhaust components, gaskets, seals, hoses, and essential electrical parts such as starters and alternators are also available—providing complete support to maintain maximum reliability and performance in demanding applications.


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