Cummins N14 STC, Celect, Celect Plus – Service Manual 001-028   Cylinder Liner

NOTE: Make sure the cylinder block and all parts are clean before assembly. If used liners are being installed again, any sealing rings removed must be installed with the same liner in the same cylinder.

Use vegetable oil to lubricate the new liner o-rings and the crevice seals.

Use vegetable oil to lubricate the o-rings.

NOTE: Do not use lubricating oil on the o-rings. The o-rings will increase in size after they have been lubricated with oil.

Install the crevice seal (1) into the top groove.

Install the black o-rings (2 and 3) into the center and the bottom grooves.

Do not apply sealant to the counterbore.

Place a sealing ring into position on the counterbore ledge.

Do not get excessive oil on the counterbore or the liner flange. Excessive oil can result in a hydraulic lock condition and generate inaccurate liner protrusion. Make sure that the o-rings do not move from the grooves.

Lubricate the crevice seal and the o-rings with vegetable oil. Install the liner in the bore with a quick push.

Use liner installation tool, Part Number 3823615, to press the cylinder liner into the cylinder block. Protrusion can be checked while the liner is held down by the installation tool.

Place the force plate (3) across the top of the liner with the step in the liner bore. Tap the top of the force plate with a soft hammer to square up and start the liner into the press fit bore.

Place the installation tool bridge (1) across the liner and install the two cylinder head capscrews finger tight to hold the bridge down. Rotate the force plate until the areas where the protrusion measurements will be taken are exposed.

CAUTION  Do not use an impact wrench to tighten the liner force plate screw.

Tighten the forcing screw (2).

Check for correct protrusion.

Use a depth gauge, Part Number 3823495, to measure the liner protrusion at four points 90 degrees apart.

The protrusion must be from 0.10 to 0.18 mm [0.004 to 0.007 in].

If correct liner protrusion is not attained, remove the liner from the cylinder block.

The desired counterbore depth is the total sum of the thickness of the liner flange and the seal rings minus the cylinder liner protrusion.

Cylinder Liner Protrusion

Check for twisted liner o-rings.

Clean the liner flange and the cylinder block liner counterbore.

Inspect the liner flange for burrs.

Inspect the cylinder block liner counterbore for burrs.

Remove the burrs, or replace the damaged parts.

Install the cylinder liner.