Saturday, January 19, 2008

Cummins Engine Repair - Torquing Cylinder Head Bolts

Cummins Engine Repair - Torquing Head Bolts on a Cummins 24 valve turbo diesel. The torque pattern is circular starting from the middle and working both ways to each end of the cylinder head.

Torque Specs Are As Follows:

  • 59 ft. lbs.
  • 77 ft. lbs.
  • Check again at 77 ft. lbs.
  • Finally advance each head bolt an additional 90 degrees
  • Since each flat side of the "hexagonal" bolt head is 60 degrees [60 X 6 sides=360 degrees]
  • One flat and 1/2 = 90 degrees.

This is the most important step when replacing any engine cylinder head gasket. If the proper torque specs are not followed bolt stretch [over torqued] or coolant leaks [under torqued] will occur and you'll have to start all over again with your Cummins Engine Repair.

Recommended: Diesel Engine Repair Manuals

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