Cummins N14 – Cylinder Heads – Installation

Use a non-petroleum-based cleaner such as Part No. 3823717.
Clean the cylinder head and the cylinder block head gasket contact surface.

Install new gaskets on the dowel pins in the cylinder block.

NOTE: Make sure the side of the gasket marked ‘‘TOP’’ is up.

Install the cylinder heads over the dowel pins. If reusing original cylinder heads, install them in their original position.

Use clean 15W-40 oil to lubricate the cylinder head capscrews and both sides of the flat washers.
Allow the excess oil to drain from the threads.
Install 12 capscrews and washers in each cylinder head.

Complete the following steps to tighten the capscrews to the specified torque values in the sequence shown:
• Tighten to 136 N•m [100 ft-lb].
• Tighten to 298 N•m [220 ft-lb].
• Rotate 90 degrees, not less than one flat, and not more than two flats.
Repeat the tightening sequence to install each cylinder head.

The markings on the head of the flange head capscrews serve as an aid during installation. After torquing the capscrew 298 N•m [220 ft-lb], mark the cylinder head adjacent to one of the two single marks ‘‘A’’ or ‘‘B’’ on the capscrew head.

After all 12 capscrews on one head have been torqued to 298 N•m [220 ft-lb], they must be rotated in the tightening direction an additional 90 degrees. Rotate the capscrew until the mark on the cylinder head is between the next two marks joined by an arc (more than one flat and less than two flats).

NOTE: When using torque plus angle, the tolerance on the 90 degree angle of rotation is one to two flats (90° plus or minus 30° ). If the capscrew is rotated beyond two flats, do not loosen the capscrew. The clamp load is still acceptable; however, rotating the capscrew beyond two flats causes additional stretch and reduces the number of reuses. With proper torquing, the capscrew can typically be reused for the life of the engine.

15. October 2020 by samuel
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