Detroit Diesel 4-71engine specs,
bolt torques and assembly clearances at Barrington Diesel Club

 
 

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    Specs for diesel engines and technical data provided courtesy of Barrington Diesel Club	
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Detroit Diesel 4-71 engine specs

Image - Barrington Diesel Club logo Detroit Diesel 4-71 Power ratings 
Detroit Diesel 4-71 Power at sea level (Industrial Engines)
rpm 1200 1400 1600 1800 2000 2100
Horse Power SAE 91 110 124 136 149 155
Power Kw 68 82 92 101 111 116
. . . . . . .
Torque Ft lbs 398 413 407 397 391 388
Torque Nm 540 560 552 438 531 526
. . . . . . .
Fuel Consumption liters/hour 15 17 19 20 22 23
Fuel Consumption US gal/hour 4.0 4.5 5.0 5.3 5.8 6.0
lbs/hp.hour 0.380 0.380 0.370 0.370 0.370 0.380
. . . . . . .
Max Toque Ft lbs 413 @ 1400 rpm
Max Torque Nm 560 @ 1400 rpm

Image - Barrington Diesel Club logo Physical Characteristics Detroit Diesel 4-71N 
Weight 1776 lbs 807 kgs
Length 42" 1067 mm
Width 29" 737 mm
Height 41" 1041 mm
Compression Ratio 18.7:1
Displacement 284Cu Inches 4,654 ml
Bore 4.250 inches 107.95 mm
Stroke 5.00 inches 127.00 mm

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Additional 4-71 Detroit Diesel Specs for Members

Thumbnail Image - Cross head Pistons - Torque, Method and Procedures Thumbnail image - IN71 Gear Train

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Spec Sheets

Thumbnail 6-71 Pleasure Craft Spec Sheet Thumbnail 6-71 Pleasure Craft Spec Sheet Thumbnail 6-71TA industrial engine spec sheet p1 Thumbnail 6-71TA industrial engine spec sheet p2

Thumbnail of 3,4 & 6-71 power unit spec sheet p1 Thumbnail of 3,4 & 6-71 power unit spec sheet p2 Thumbnail of 3,4,6 & 8-71 power unit spec sheet p1 Thumbnail of 3,4,6 & 8v-71 power unit spec sheet p2

In-line 3, 4, and 6-71 Fire Pump engine spec sheet

Thumbnail of 3,4 & 6-71 fire pump spec sheet p1 Thumbnail of 3,4 & 6-71 fire pump spec sheet p2 Thumbnail of 3,4 & 6-71 fire pump spec sheet p3 Thumbnail of 3,4 & 6-71 fire pump spec sheet p4

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Image - Barrington Diesel Club logo Selected torque specifications Detroit Diesel 4-71N Engine 
Torques (Non standard) Bolt Size Ft Lbs Nm
Air box cover 3/8 NC 15 20
Con Rod bolts / Big Ends 7/16 UNF 67 90
Cam and Balance-shaft nuts 1 1/8 UNF 300 407
Cam follower guide bolts ¼NC 15 20
* Crank end bolt 1" UNF 290 393
* Cylinder head 5/8 NC 184 250
Flywheel Housing Bolts 1/2 NC 95 130
Fuel Connectors 7/16 UNF 35 45
Fuel Line Nuts 3/8 UNF 15 20
Idler gear hub bolts 3/8 NC 40 54
Injector clamp bolts 3/8 NC 25 34
* Mains 5/8 NC 184 250
Rocker shaft bolts 1/2 NC 96 130
Sump bolts 5/16 NC 10 14
* Flywheel bolts 9/16 UNF 184 250
. . . .
* Lubricate with 'International Compound No 2, or Copper-Slip' or equivalent.

Image - Barrington Diesel Club logo Selected Settings Detroit Diesel 4-71N 
Set Inches mm
Injectors(N60) 1.460 37.10
Injectors (N65 brown tag) 1.484 37.69
Valves (4v head -cold) 0.016 0.41
Valves (2v head -cold) 0.012 0.30

Image - Barrington Diesel Club logo Selected Tune up & useful information 4-71N Detroit Diesel engines 
Item Condition
Altitude deration 2.5% for every 300 m or 1000 ft
Cooling System - engine capacity 4.40 liters
Cooling System - radiator capacity 8.80 liters
Firing Order 1-3-4-2
Oil consumption normal 60 to 120 ml per hour
Oil pan capacity average 14 liters, full mark 50 mm below sump top
Speed full load max Most common at 2100 rpm
Speed no load max Most common at 2275 rpm
Speed at idle commonly at 680 rpm

Image - Barrington Diesel Club logo Selected Standard Sizes and useful clearances Detroit Diesel 4-71N 
Part Min inches Max inches Limits ins Min mm Max mm Limits mm
Con Rod - ID Small End Bush 1.5025 1.5030 1.5080 38.1635 38.1762 38.3032
Con Rod - Length center to center 10.1240 10.1260 . 257.1496 257.2004 .
Crankshaft end float 0.0040 0.0160 . 0.10 0.41 .
Crankshaft Big end Std Diameter 2.7490 2.7500 . 69.8246 69.8500 .
Crankshaft Mains Std Diameter 3.4990 3.5000 . 88.8746 88.9000 .
Cyl liner - flange below block 0.0450 0.0500 0.0500 1.1430 1.2700 .
Cyl Liner - flange below block variation 0.0000 0.0020 . 0.00 0.05 .
Cyl Liner - ID 4.2495 4.2511 . 107.9373 107.9779 .
Cyl Liner - OD Std 4.6250 4.6260 . 117.4750 117.5004 .
Piston skirt diameter 4.2428 4.2450 . 107.7671 107.8230 .
Ring gap - compression rings 0.0180 0.0430 0.0600 0.4572 1.0922 1.5200
Ring gap - oil rings 0.0050 0.0140 0.0340 0.1270 0.3556 0.8636

Image - Barrington Diesel Club logo Operating Conditions 4-71N series engines 
Item Condition
Compression (sea level) New parts - average 39 bar
Compression (sea level) New parts - min 35 bar @ 600 rpm
Fuel Pressure @ 1500 rpm 3 bar
Oil Pressure - normal operation 3.5 bar
Oil Pressure - idle 0.8 bar
Oil Temperature - sump 90-113°C
Water Temperature 77-91°C