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Cummins QST30 Diesel Engine Bolt Tightening Torques


Cummins QST30 Main Bearing Bolt torque
Step1 = 290 Nm
Step2 = 570 Nm
Step3 = +90 degrees

Cummins QST30 Connecting Rod Bolt torque
Step1 = 70 Nm
Step2 = recheck 70 Nm
Step3 = + 90 degrees

Cummins QST30 Cylinder Head Bolt torque
for bolts 1-6:
Step1 = 150 Nm
Step2 = 220 Nm
Step3 = + 90 degrees

bolt No. 7:
Step1 = 70 Nm

Komatsu 12v40 Diesel Engine Specs


Cummins QST30 Arrangement, displacement, bore and stroke
12v engine,

30.5 liter

140.0 mm

165.0 mm

Cummins QST30 Power and torque
574-603 kW @ 2000 rpm

3350-3730 Nm @ 1400 rpm

Cummins QST30 Dimensions and weight
approx dimensions
varies according to machine:

length = 1715-2000 mm
width = 1450-1515 mm
height = 1592 mm

3200 kg

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