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Matthias, Technician
Category: Heavy Equipment
Satisfied Customers: 114
Experience:  10+ Yrs experience in Heavy Duty / Automotive / John Deere,New Holland and Case IH, Cummins and Cat
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What are the torque specs for a Cummins 3.9 engine? Model # XXXXX 3.

Resolved Question:

What are the torque specs for a Cummins 3.9 engine? Model # XXXXX 3.9p. This is for a wood chipper.
Submitted: 8 years ago.
Category: Heavy Equipment
Expert:  Matthias replied 8 years ago.

Hello there


Assuming these are specs you want.


Start the headbolts in the middle and work your way out in a circle


Head bolts 66 ft/lbs

Headbolts through the rocker shaft post 89 ft/lbs

then all another 90 degrees


Main bearings 129 ft/lbs

Rods 74 ft/lbs



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