TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Specifications
Section E - Engine Identification
Page E-5
General 4B Engine Data (nonautomotive)
4B3.9
4BT3.9
4BTA3.9
Bore
102 mm [4.02 in]
102 mm [4.02 in]
102 mm [4.02 in]
Stroke
120 mm [4.72 in]
120 mm [4.72 in]
120 mm [4.72 in]
3.9 liters [238 in3]
3.9 liters [238 in3]
3.9 liters [238 in3]
Displacement
Engine Weight (dry) Less Flywheel
308 kg [679 lb]
320 kg [705 lb]
329 kg [725 lb]
and Electric Components
Firing Order
1, 3, 4, 2
1, 3, 4, 2
1, 3, 4, 2
Valve Clearances:
- Intake
0.25 mm [0.010 in]
0.25 mm [0.010 in]
0.25 mm [0.010 in]
- Exhaust
0.51 mm [0.020 in]
0.51 mm [0.020 in]
0.51 mm [0.020 in]
Compression Ratio
18.5:1
17.5:1
16.5:1
Rotation, Viewed from the
Clockwise
Clockwise
Clockwise
Front of the Engine
Aspiration:
- Naturally Aspirated
X
- Turbocharged
X
X
- Aftercooled
X
General 6B Engine Data (nonautomotive)
6B5.9
6BT5.9
6BTA5.9
Bore
102 mm [4.02 in]
102 mm [4.02 in]
102 mm [4.02 in]
Stroke
120 mm [4.72 in]
120 mm [4.72 in]
120 mm [4.72 in]
5.88 liters [359 in3]
5.88 liters [359 in3]
5.88 liters [359 in3]
Displacement
Engine Weight (dry) Less
388 kg [855 lb]
399 kg [880 lb]
411 kg [906 lb]
Flywheel and Electric Components
Firing Order
1, 5, 3, 6, 2, 4
1, 5, 3, 6, 2, 4
1, 5, 3, 6, 2, 4
Valve Clearances:
- Intake
0.25 mm [0.010 in]
0.25 mm [0.010 in]
0.25 mm [0.010 in]
- Exhaust
0.51 mm [0.020 in]
0.51 mm [0.020 in]
0.51 mm [0.020 in]
Compression Ratio
18.5:1
17.5:1
16.5:1
Rotation, Viewed from the
Clockwise
Clockwise
Clockwise
Front of the Engine
Aspiration:
- Naturally Aspirated
X
- Turbocharged
X
X
- Aftercooled
X
L-557
