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Cummins ISB-QSB specifications and manuals




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Your Diesel Engine Specs

Basic specs are open to everyone and include images, displacement, dimensions and weight, essential bolt tightening torques, the characteristics of the engine like its power and torque.
Essential bolt tightening torques are the main bearing cap bolt torque, the connecting rod cap bolt torque and the cylinder head bolt torques.


Some Popular Engine Specs


Cummins ISB and QSB bolt torques, specifications and manuals

Cummins ISB and QSB Essential Diesel Engine Bolt Tightening Torques

Main Bearing capscrews
Used bolts
Step 1 = 50 Nm, 37 lb.ft
Step 2 = 80 Nm, 60 lb.ft
Step 3 = + 90°

Main Bearing capscrews
New bolts
Step 1 = 120 Nm, 90 lb.ft
Step 2 = loosen all
Step 3 = 60 Nm, 45 lb.ft
Step 4 = 85 Nm, 63 lb.ft
Step 5 = + 120°

Connecting Rod Bolts
step 1 = 30 Nm, 22 lb.ft
step 2 = 60 Nm, 44 lb.ft
step 3 = + 60°

Cylinder head capscrews
step 1 = 90 Nm, 66 lb.ft
step 2 = repeat above
step 3 = + 90°


Cummins ISB and QSB Diesel Engine Specs

Cummins ISB and QSB engines
4-cylinder engines
Displacement 3.9 liter, 238 CID 
Bore 102 mm, 4.02 in
Stroke 120 mm, 4.72 in

Displacement 4.5 liter, 275 CID
Bore 107 mm, 4.21 in
Stroke 124 mm, 4.88 in

6-cylinder engines
Displacement 5.9 liter, 360 CID
Bore 102 mm, 4.02 in
Stroke 120 mm, 4.72 in

Displacement 6.7 liter, 409 CID
Bore 107 mm, 4.21 in
Stroke 124 mm, 4.88 in
Power Ratings
4 CYL
Power from:
 140 to 185 hp
 104 to 138 kW @ 2500 rpm

Torque from:
 550 to 750 Nm 
 406 to 553 lb.ft
 @ 1200 to 1600 rpm

6 CYL
Power from:
 205 to 300 hp
 153 to 224 kW @ 2500 rpm

Torque from:
 750 to 1150 Nm 
 553 to 848 lb.ft
 @ 1200 to 1700 rpm
5.9 liter approx Dimensions:
length 1036 mm, 41 in
width 836 mm, 33 in
height 880 mm, 35 in

5.9 liter approx Weight:
612 kg, 1350 lb

6.7 liter approx Dimensions:
length 1097 mm, 43 in
width 910 mm, 36 in
height 857 mm, 34 in

6.7 liter approx Weight:
659 kg, 1450 lb


Cummins ISB and QSB Diesel Engine Spec Sheets


Cummins ISB and QSB Diesel Engine workshop repair Manuals




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Phone: +27 72 754 4660
email: steve@barringtondieselclub.co.za
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