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Cummins ISB and QSB Essential Diesel Engine Bolt Tightening Torques

 
Cummins ISB QSB 
Main Bearing capscrew torques

Used bolts
Step 1 = 50 Nm, 37 lb.ft
Step 2 = 80 Nm, 60 lb.ft
Step 3 = + 90 degrees

Cummins ISB QSB 
Main Bearing capscrew torques

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 degrees


Cummins ISB QSB 
Connecting Rod Bolt torques
 

step 1 = 30 Nm, 22 lb.ft
step 2 = 60 Nm, 44 lb.ft
step 3 = + 60 degrees

Cummins ISB QSB 
Cylinder Head capscrew torques
 

step 1 = 90 Nm, 66 lb.ft
step 2 = repeat above
step 3 = + 90 degrees


Cummins ISB and QSB Diesel Engine Specs

 
Cummins ISB and QSB 
Displacement, bore and stroke
 

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

Cummins ISB and QSB 
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

Cummins ISB and QSB 
Dimensions and weight
 

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


manuals and spec sheets for Cummins ISB and QSB engines
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