Detroit Diesel 8V-71 engine specs at Barrington Diesel Club.

Barrington Diesel club is your source of Detroit Diesel engine specs and technical data.

Detroit Diesel 8V-71 engine specs are to be found at Barrington Diesel Club, whose aim it is to provide technical data, specs and bolt torques relevant to Cummins, Detroit Diesel, EMD and ADE engines.
At Barrington diesel club bolt tightening torques and fuel consumption rates are provided for many engines beginning with Detroit Diesel,Cummins, and ADE. Our Web Log provides a forum for discussing diesel engine features and problems. We also provide general technical data such as Standard Torques for bolts and nuts, Properties of materials like the melting and boiling points of metals, metric to imperial cross references, SAE Flywheel housing sizes, as well as providing articles of general interest like discussions on fuel consumption and Detroit Diesel Air Box Pressures.

View Terms & Conditions

Detroit Diesel 8v-71 Power at sea level (Industrial Engines)
description	8V-71N - N65 Injectors	description	8V-71T - N70 Injectors
rpm	1200	1400	1600	1800	2000	2100	rpm	1200	1400	1600	1800	2000	2100
Horse Power SAE	195	230	258	275	300	318	Horse Power SAE	220	258	290	325	340	362
Power Kw	145	172	192	205	224	237	Power Kw	164	192	216	242	254	270
.	.	.	.	.	.	.	.	.	.	.	.	.	.
Torque Ft lbs	853	863	847	802	788	795	Torque Ft lbs	963	968	952	948	893	905
Torque Nm	1157	1170	1148	1088	1068	1078	Torque Nm	1306	1312	1291	1286	1211	1228
.	.	.	.	.	.	.	.	.	.	.	.	.	.
Fuel Consumption l/hour	45.7	51.5	57.7	60.1	63.9	67.8	Fuel Consumption l/hour	48.7	55.0	60.3	66.7	68.8	74.3
.	.	.	.	.	.	.	.	.	.	.	.	.	.
Max Toque Ft lbs	863 @ 1400 rpm	Max Toque Ft lbs	968 @ 1400 rpm
Max Torque Nm	1170 @ 1400 rpm	Max Torque Nm	1312 @ 1400 rpm

Detroit Diesel 8v-71 Power at sea level (Industrial Engines)

description

8V-71N - N65 Injectors

description

8V-71T - N70 Injectors

rpm

1200

1400

1600

1800

2000

2100

rpm

1200

1400

1600

1800

2000

2100

Horse Power SAE

195

230

258

275

300

318

Horse Power SAE

220

258

290

325

340

362

Power Kw

145

172

192

205

224

237

Power Kw

164

192

216

242

254

270

Torque Ft lbs

853

863

847

802

788

795

Torque Ft lbs

963

968

952

948

893

905

Torque Nm

1157

1170

1148

1088

1068

1078

Torque Nm

1306

1312

1291

1286

1211

1228

Fuel Consumption l/hour

45.7

51.5

57.7

60.1

63.9

67.8

Fuel Consumption l/hour

48.7

55.0

60.3

66.7

68.8

74.3

Max Toque Ft lbs

863 @ 1400 rpm

Max Toque Ft lbs

968 @ 1400 rpm

Max Torque Nm

1170 @ 1400 rpm

Max Torque Nm

1312 @ 1400 rpm

Physical Characteristics Detroit Diesel 8V-71N
Weight	2310 lbs	1048 kgs
Length	47"	1194 mm
Width	39"	991 mm
Height	51"	1295 mm
Compression Ratio	18.7:1
Displacement	568 Cu Inches	9308 ml
Bore	4.250 inches	107.95 mm
Stroke	5.00 inches	127.00 mm

Physical Characteristics Detroit Diesel 8V-71N

Weight

2310 lbs

1048 kgs

Length

47"

1194 mm

Width

39"

991 mm

Height

51"

1295 mm

Compression Ratio

18.7:1

Displacement

568 Cu Inches

9308 ml

Bore

4.250 inches

107.95 mm

Stroke

5.00 inches

127.00 mm

Torque specifications Detroit Diesel 8V-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 NF	67	90
Cam and Balance-shaft nuts	1 1/8 NF	300	407
Cam follower guide bolts	¼NC	15	20
* Crank end bolt	1" NF	290	393
* Cylinder head	5/8 NC	184	250
Flywheel Housing Bolts	1/2 NC	95	130
Fuel Connectors	7/16 NF	35	45
Fuel Line Nuts	3/8 NF	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 NF	184	250
.	.	.	.
*	Lubricate with 'International Compound No 2, or Copper-Slip' or equivalent.

Torque specifications Detroit Diesel 8V-71N Engine

Torques (Non standard)

Bolt Size

Ft Lbs

Air box cover

3/8 NC

Con Rod bolts / Big Ends

7/16 NF

Cam and Balance-shaft nuts

1 1/8 NF

300

407

Cam follower guide bolts

¼NC

* Crank end bolt

1" NF

290

393

* Cylinder head

5/8 NC

184

250

Flywheel Housing Bolts

1/2 NC

130

Fuel Connectors

7/16 NF

Fuel Line Nuts

3/8 NF

Idler gear hub bolts

3/8 NC

Injector clamp bolts

3/8 NC

* Mains

5/8 NC

184

250

Rocker shaft bolts

1/2 NC

130

Sump bolts

5/16 NC

* Flywheel bolts

9/16 NF

184

250

Lubricate with 'International Compound No 2, or Copper-Slip' or equivalent.

71 Series Pistons

On Cross-Head pistons - Torquing con rod to piston/gudgeon pin

Caution - Failure of piston pin retainer bolts is always catastrophic, often a hole in the block - it happened on two occasions to me while dyna-testing engines
Suggestion - Apply locktite (or equivalent thread lock compound) to the 7/16 NF bolts
torque to 60 lb-ft, 80 Nm; do not exceed torque

Installing piston/gudgeon pin retainer plates

Caution - Leaking retainer plates are only remedied by extensive rework, i.e. head and sump at least must be removed again.
Suggestion - Apply shellac (or equivalent compound) to rim of retainer plates
Rap retainer plate into place with a domed/rounded object of similar size to the plate. (small machined nylon rod is ideal)
Allow shellac to dry (overnight)
Test piston plate seal by pouring power-paraffin or diesel into the inverted piston, the outside of the plate must remain completely dry, let it stand for a few minutes before using it to make sure.

Common Settings Detroit Diesel 8V-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

Common Settings Detroit Diesel 8V-71N

Set

Inches

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

Standard Sizes and useful clearances Detroit Diesel 8V-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 centre to centre	10.1240	10.1260	.	257.1496	257.2004	.
Crankshaft end float	0.0040	0.0160	.	0.10	0.41	.
Crankshaft Big end Std Diameter	2.9990	3.0000	.	76.1746	76.2000	.
Crankshaft Mains Std Diameter	4.4990	4.5000	.	114.2746	114.3000	.
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

Standard Sizes and useful clearances Detroit Diesel 8V-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 centre to centre

10.1240

10.1260

257.1496

257.2004

Crankshaft end float

0.0040

0.0160

0.10

0.41

Crankshaft Big end Std Diameter

2.9990

3.0000

76.1746

76.2000

Crankshaft Mains Std Diameter

4.4990

4.5000

114.2746

114.3000

Cyl liner - flange below block

0.0450

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

Tune up & useful information 8V-71N Detroit Diesel engines
Item	Condition
Altitude deration - Natural aspiration	2.5% for every 300 m or 1000 ft
Altitude deration - Turbo engines	1% for every 300 m or 1000 ft
Cooling System - engine capacity	7.0 US gallons, 26.5 litres
Firing Order RH Rotation Engine	1L-3R-3L-4R-4L-2R-2L-1R
Oil consumption	normal 100 to 240 ml per hour
Oil pan capacity	average 26 litres, 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

Tune up & useful information 8V-71N Detroit Diesel engines

Item

Condition

Altitude deration - Natural aspiration

2.5% for every 300 m or 1000 ft

Altitude deration - Turbo engines

1% for every 300 m or 1000 ft

Cooling System - engine capacity

7.0 US gallons, 26.5 litres

Firing Order RH Rotation Engine

1L-3R-3L-4R-4L-2R-2L-1R

Oil consumption

normal 100 to 240 ml per hour

Oil pan capacity

average 26 litres, 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

Operating Conditions 8v-71N series engines
Item	Average	Minimum
Compression - Naturally Aspirated Engines(sea level)	New parts - average 565 psi/ 39 bar @ 600 rpm	New parts - average 475 psi/ 32.7 bar @ 600 rpm
Compression - Turbo Engines (sea level)	New parts - average 500 psi/ 34.5 bar @ 600 rpm	New parts - average 425 psi/29.3 bar @ 600 rpm
Fuel Pressure @ 1500 rpm	50-70 psi, 3.5-4.8 bar	30 psi, 2.0 bar
Oil Pressure - normal operation	50-70 psi, 3.5-4.8 bar	30 psi, 2.0 bar
Oil Pressure - idle operation	8-14 psi, 0.5-1.0 bar	7 psi, 0.5 bar
Oil Temperature - sump	90-113°C	.
Water Temperature	77-91°C	.

Operating Conditions 8v-71N series engines

Item

Average

Minimum

Compression - Naturally Aspirated Engines(sea level)

New parts - average 565 psi/ 39 bar @ 600 rpm

New parts - average 475 psi/ 32.7 bar @ 600 rpm

Compression - Turbo Engines (sea level)

New parts - average 500 psi/ 34.5 bar @ 600 rpm

New parts - average 425 psi/29.3 bar @ 600 rpm

Fuel Pressure @ 1500 rpm

50-70 psi, 3.5-4.8 bar

30 psi, 2.0 bar

Oil Pressure - normal operation

50-70 psi, 3.5-4.8 bar

30 psi, 2.0 bar

Oil Pressure - idle operation

8-14 psi, 0.5-1.0 bar

7 psi, 0.5 bar

Oil Temperature - sump

90-113°C

Water Temperature

77-91°C

Full Load expected Air Box Pressures for Detroit Diesel engines
Indicated in inches and mm of mercury
rpm	1800	2000	2100
Naturally aspirated N engines	1", 25 mm	4", 100 mm	5", 125 mm
Turbo engines	22", 594 mm	28", 756 mm	30", 810 mm
TI engines	27", 686 mm	32", 864 mm	35", 945 mm
Notes: Measuring Air Box Pressure Connect a manometer to one air box drain. Measure pressure at fixed RPM's The above table gives an indication of what to expect, but air box pressures vary with altitude and from engine to engine, injector to injector, turbo to turbo; so take nothing as definitive. If your air box pressures are close to the values listed in the table there is normally no problem in this area. If you're at all concerned, contact the local agents with your model and serial number for further advice.

Full Load expected Air Box Pressures for Detroit Diesel engines

Indicated in inches and mm of mercury

rpm

1800

2000

2100

Naturally aspirated N engines

1", 25 mm

4", 100 mm

5", 125 mm

Turbo engines

22", 594 mm

28", 756 mm

30", 810 mm

TI engines

27", 686 mm

32", 864 mm

35", 945 mm

Notes: Measuring Air Box Pressure

Connect a manometer to one air box drain. Measure pressure at fixed RPM's
The above table gives an indication of what to expect, but air box pressures vary with altitude and from engine to engine, injector to injector, turbo to turbo; so take nothing as definitive.
If your air box pressures are close to the values listed in the table there is normally no problem in this area.
If you're at all concerned, contact the local agents with your model and serial number for further advice.

Detroit Diesel 8V-71 engine specs at Barrington Diesel Club.

Barrington Diesel club is your source of Detroit Diesel engine specs and technical data.

Specs for 8V-71 Detroit Diesel engines and technical data provided courtesy of Barrington Diesel Club

71 Series Pistons

On Cross-Head pistons - Torquing con rod to piston/gudgeon pin

Installing piston/gudgeon pin retainer plates