Komatsu 155-4 series engines - specifications and manuals

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Workshop manual, specs and bolt torques for Komatsu 155-4 engines

Komatsu 155-4 series Main Bearing Bolts
step 1 = 310 Nm
step 2 = 610 Nm
step 3 = loosen all
step 4 = 155 Nm
step 5 = 290 Nm
step 6 = 520 Nm
step 7 = 740 Nm

Komatsu 155-4 series Connecting Rod Bolts
step 1 = 210 Nm
step 2 = 415 Nm
step 3 = loosen all
step 4 = 80 Nm
step 5 = 210 Nm
step 6 = 285 Nm
step 7 = 420 Nm

Komatsu 155-4 series Cylinder Head Bolts
step 1 = 290 Nm
step 2 = 440 Nm
step 3 = 550 Nm

N.B. Specifications for more variants of the 155-4 and 155-4A engines are in the workshop repair manual

Komatsu 155-4 series Arrangement, displacement, bore and stroke

Arrangement
4 cylinder in line engine,
turbocharged

Displacement
155-4 series - 12.840 liter

Bore
155.0 mm
Stroke
170.0 mm

Komatsu 155-4 series Power

210-240 hp, 156-178 kW
@ 1850 rpm

Komatsu 155-4 series Dimensions and weight

Dimensions
length 1456 mm
width 1125 mm
height 1910 mm
(excluding exhaust pipe)

Weight
approx
2050 kg

N.B. Specifications for more variants of the 155-4 and 155-4A engines are in the workshop repair manual

Komatsu 155-4 series Arrangement, displacement, bore and stroke

Arrangement
6 cylinder in line engine,
turbocharged

Displacement
155-4 series - 19.260 liter

Bore
155.0 mm

Stroke
170.0 mm

Komatsu 155-4 series Power

270-350 hp, 220-238 kW
@ 2000 rpm

Komatsu 155-4 series Dimensions and weight

Dimensions
length 1890 mm
width 1190 mm
height 1930 mm
(excluding exhaust pipe)

Weight
approx
2575 kg