head bolt torque spec

[speedfreak]

Just wondering what the torque spec is on a 1990 B series cummins enigen with the rotary pump,, Just looking fot the head bolt torque specs, Thanks Jeremy

 

[speedfreak]

any body

 

[oldestof11]

Same as a 94-98 12v. Some people put new ones in and torque them slowly to 125ft lbs...

 

[1stgenjake]

sounds right to me...i have ARP at 110 or 125 cant remember for sure

 

[JQmile]

Factory uses torque-angle methods, but most people just wrench em down to 125 lb ft. Torque em to about 90 lb-ft and then mark em. Go c.5-10 lb-ft at a time. If a few turn way further than the others, replace them with another bolt.

 

[Apacheglen]

Great advice, this is the same practice in the aircraft industry. Especially where you bring the torque up 10lbs at a time, and check for consistant number of turn angles on each bolt... Replace any bolt that appears to stretch...