Detroit Diesel 6-71 engine specs,
bolt torques and assembly clearances at Barrington Diesel Club
Specs for diesel engines and technical data provided courtesy of Barrington Diesel Club's Advertisers and Members
| Detroit Diesel 6-71 Power ratings |
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|---|---|---|---|---|---|---|
| Naturally Aspirated Industrial engines at sea level | ||||||
| rpm | 1200 | 1400 | 1600 | 1800 | 2000 | 2100 |
| Horse Power SAE | 136 | 160 | 186 | 205 | 220 | 230 |
| Power kW | 101 | 119 | 138 | 153 | 164 | 172 |
| . | . | . | . | . | . | . |
| Torque Ft lbs | 595 | 600 | 609 | 598 | 578 | 575 |
| Torque Nm | 807 | 814 | 826 | 811 | 783 | 780 |
| . | . | . | . | . | . | . |
| Fuel Consumption US gallons/hour | 5.8 | 6.6 | 7.4 | 8.1 | 8.5 | 9.0 |
| Fuel Consumption liters/hour | 22 | 25 | 28 | 31 | 32 | 34 |
| Notes on fuel consumption | ||||||
| . | . | . | . | . | . | . |
| Max Toque Ft lbs | 609 @ 1600 rpm | |||||
| Max Torque Nm | 826 @ 1600 rpm | |||||
| Physical Characteristics Detroit Diesel 6-71N |
||
|---|---|---|
| Weight | 2185 lbs | 993 kgs |
| Length | 54" | 1372 mm |
| Width | 29" | 737 mm |
| Height | 41" | 1041 mm |
| Compression Ratio | 18.7:1 | |
| Displacement | 426 cu Inches | 6981 ml |
| Bore | 4.250 inches | 107.95 mm |
| Stroke | 5.00 inches | 127.00 mm |
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Spec Sheets:
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| Selected torque specifications Detroit Diesel 6-71N Engine |
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|---|---|---|---|
| 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. | ||
| Selected Settings Detroit Diesel 6-71N |
||
|---|---|---|
| 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 |
| Selected Tune up & useful information 6-71N Detroit Diesel engines |
|
|---|---|
| Item | Condition |
| Altitude deration | 2.5% for every 300 m or 1000 ft |
| Cooling System - engine capacity | 6.90 liters |
| Cooling System - radiator capacity | 13.90 liters |
| Firing Order | 1-5-3-6-2-4 |
| Oil consumption | normal 100 to 200 ml per hour |
| Oil pan capacity | average 26 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 |
| Selected Standard Sizes and useful clearances Detroit Diesel 6-71N |
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|---|---|---|---|---|---|---|
| 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 |
| Operating Conditions 6-71N 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 |