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How to Torque a Cummins Marine C-Series Cylinder Head

How to Torque a C-Series Cylinder Head
How to Torque a C-Series Cylinder Head

 

Post 1991 – Used Cylinder Block and Used Cap Screws

The top of the cylinder head capscrew is identified with an angle marking. The cylinder head capscrews must be tightened by the five-step “torque plus angle” method, as described here.

  1. Follow the numbered sequence and tighten all 26 capscrews. Torque Value: 70 n.m [52 ft-lb]
  2. Follow the numbered sequence and tighten only the 14 long capscrews. (Number 1, 2, 7, 8, 9, 10, 15, 16, 17, 18, 23, 24, 25, and 26.) Torque Value: 145 n.m [105 ft-lb]
  3. Retighten the short capscrews: Number 3, 4, 5, 6, 11, 12, 13, 14, 19, 20, 21, and 22 because of cylinder head relaxation and to obtain proper cylinder head torque requirements. Torque Value: 70 n.m [52 ft-lb]
  4. Follow the numbered sequence and retighten only the 14 long capscrews. (Number 1, 2, 7, 8, 9, 10, 15, 16, 17, 18, 23, 24, 25, and 26.) Torque Value: 145 n.m [105 ft-lb] NOTE: To turn the capscrew accurately to the desired angle, orientate according to the small “dot” and “window” marked on the capscrew head, or use the torque angle gauge for ½-inch drive, Part Number 3823878, or torque angle gauge for ¾-inch drive, Part Number 3823879. Mark the cylinder head adjacent to the dot on the capscrew head. This mark will serve as an indexing aid.
  5. Rotate the capscrew until the mark that has been made on the cylinder head

You are now done w/ the FIVE Steps!