Torque Specifications For Detroit Diesel 71 Series Inline (Not Including 2 Cylinder)

June 9, 2023

Torque Specifications for Detroit Diesel 71 Inline Engines (Excluding 271): A Complete Guide

Detroit Diesel’s 71 series inline engines have been a staple in various industries, known for their rugged performance and reliability. Whether used in marine, industrial, or commercial applications, ensuring proper torque specifications during maintenance and repairs is essential for optimal engine performance and longevity. In this guide, we provide the crucial torque specs for Detroit Diesel 71 inline engines (excluding the 271), helping you keep these workhorse engines running efficiently.

Torque Specifications For Detroit Diesel Series 71 (Inline Except 2 Cylinder)
Thread Size (in.)
Description
 Torque Specifications
lb-ft N-m
1/4-20
 Standard Torque Specification 7-9 9-12
Bolt-Injector Control Shaft Bracket 10-12 14-16
Bolt-Cam Follower Guide 12-16 16-22
1/4-28
 Standard Torque Specification 96-120 130-163
Screw-Inj. Rack Control Lever 24-36 33-49
5/16-18
 Standard Torque Specification 156-204 212-277
Bolt-Oil Pan (Cast) – Hard Gasket 13-21 18-28
Bolt-Oil Pan (Low Pan or In Aluminum F/W Hsg. & Front Cover) 10-12 14-16
5/16-24
 Standard Torque Specification 15-19 20-26
Nut-Lock-Push Rod 15-19 20-26
Bolt-Blower Drive Coupling Rotor Gear 20-25 27-34
Bolt-Blower Rotor Gear Hub 25-30 34-41
Nut-Lock Valve Bridge Adj. Screw 20-25 27-34
7/16-14
 Standard Torque Specification 46-50 62-68
Bolt-Tach. Drive 30-35 41-47
Bolt-Lifter Bracket 55-60 75-81
Bolt-Valve Bridge Guide (Nylon-Insert) 46-50 62-68
Bolt-Flywheel Housing Large Hole Cover 30-35 41-47
Bolt-Blower to Block 55-60 75-81
7/16-20
 Standard Torque Specification 57-61 77-83
Connector-Fuel (Steel Washer) 40-45 54-61
Nut-Exhaust Manifold 30-35 41-47
Nut-Connecting Rod 60-70 81-95
Connector- Fuel (Nylon Insert) 30-35 41-47
Nut-Connecting Rod 60-70 81-95
Bolt-Connecting Rod to Pin 55-60 75-81
3/8-16
 Standard Torque Specification 30-35 41-47
Bolt-Camshaft & Seal End Bearing 35-40 47-54
Bolt-Flywheel Hsg to Idler Gear & Dummy 40-45 54-61
Bolt-Air Box Cover 10-15 14-20
Bolt-Rocker Cover Hold-Down Special 12-Point 15-20 20-27
Bolt-Injector Clamp 20-25 27-34
Bolt-Oil Pan 10-20 14-27
3/8-24
 Standard Torque Specification 35-39 47-53
Bolt-Accessory Drive to Balance Gear (Steel Disc) 45-50 61-68
Bolt-Lower Front Cover 25-30 34-41
Nut-Water Manifold 20-25 27-34
Bolt-Balance Weight to Hub 25-30 34-41
Bolt-Balance Weight to Timing Gear 25-30 34-41
Bolt & Nut-Blower Drive Gear 25-30 34-41
Nut-Exhaust Outlet Manifold Flange 20-25 27-34
Nut-Fuel Jumper Line O Ring 13-17 18-23
Nut-Fuel Jumper Line Flared 11-13 15-18
Nut-Injector Clamp 20-25 27-34
1/2-13
 Standard Torque Specification 71-75 96-102
Bolt-Flywheel Housing 90-100 122-136
Bolt-Idler Gear Hub and Dummy Hub 80-90 108-122
Bolt-Tach. Drive Cover 30-35 41-47
Bolt-Engine Mtg Brkt to Frt Cover 90-100 122-136
Bolt-Front Cover (Crankshaft) 80-90 108-122
Bolt-Flywheel Housing Large Hole Cover 30-35 41-47
Bolt-Rocker Shaft Bracket to Cyl Head 90-100 122-136
1/2-20
 Standard Torque Specification 83-93 113-126
Bolt-Blower Rotor Gear Retainer 55-65 75-88
Nut-Oil Pump Drive Idler Gear Shaft 60-70 81-95
9/16-12 Standard Torque Specification 90-100 122-136
9/16-18
 Standard Torque Specification 107-117 145-159
Nut-Crankshaft Bearing Cap 140-150 190-203
Bolt-Flywheel 180-190 244-258
Bolt-Flywheel (V-53) 12-16 16-22
Bolt-Cylinder Head 140-150 190-203
5/8-11
 Standard Torque Specification 137-147 186-199
Bolt-Starter to Aluminum Flywheel Housing 95-105 129-142
Bolt-Main Bearing (Boring) 165-175 224-237
Bolt-Main Bearing (Assembly) 180-190 244-258
Bolt-Cylinder Head 190-200 258-271
5/8-18
 Standard Torque Specification 168-178 228-241
Bolt-Lube Oil Filter Center 50-60 68-81
Nut-Alternator Pulley 70-80 95-108
Nut-Special Self Locking Nut (10SI Alternator) 40-60 54-81
Bolt-Main Bearing (Boring) 140-155 190-210
Bolt-Main Bearing (Assembly) 155-185 210-251
Nut-Cylinder Head 190-200 258-271
3/4-10 Bolt-Crankshaft Main Bearing 280-290 380-393
3/4-16
 Standard Torque Specification 290-300 393-407
Nut-Accessory Drive Pulley 120-140 163-190
3/4-18 Nut Standard, Dipstick Tube 30-35 41-47
3/4-24 Bolt-Balance Weight Cover 25-30 34-41
7/8-14 Standard Torque Specification 475-485 644-658
7/8-18 Bolt-Oil Pump Relief Valve Cover 25-35 34-47
1-14 Bolt Crankshaft End 440-460 597-624
1 1/8-18 Nut-Cam and Balance Shaft 300-325 407-441
1 3/4-16 Nut-Transfer Drive Gear (Marsden) 375-400 508-542

Torque Specs For Detroit Diesel Series 71 (Inline Except 2 Cylinder) Pipe Plug
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 (3/4 Taper) 38-42 52-57
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 1/4-11 1/2 Plug-Pipe (7/8 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
1/2-20 Plug-Fuel Pump Relief Valve 18-22 24-30
1 1/4-16 Plug-Oil Filter Bypass valve 95-105 129-142

Torque Specs For Detroit Diesel Series 71 (Inline Except 2 Cylinder) Stud
Thread Size (in.)
Description
 Torque Specifications
lb-ft N-m
7/16-20 Stud Standard 30-35 41-47
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