Cummins N14 STC, Celect, Celect Plus – Service Manual 001-009   Camshaft Bearing Support

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Disconnect the batteries. Refer to the OEM service manual.
• Remove the alternator drive belt. Refer to Procedure 013-001 in Section 13.
• Remove the vibration damper. Refer to Procedure 001-052 in Section 1.
• Remove the crankshaft pulley. Refer to Procedure 001-022 in Section 1.

Remove the three capscrews from the support.

Use a rubber or plastic mallet to rotate the bearing support approximately 60 degrees.

NOTE: Be careful not to damage the bearing support surfaces when removing the bearing support.

Use a suitable pry bar to remove the bearing support from the gear cover.

Remove the o-ring and the shims from the bearing support.

NOTE: Do not dispose of the shims.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Clean the bearing support and shims with solvent.

Dry with compressed air.

Inspect the bearing support for cracks or other damage on the thrust surface.

Install the support bearing into the bore of the gear cover. Do not install the o-ring onto the support at this time.

Push the support against the camshaft so the camshaft gear rests against the camshaft thrust washer.

Hold the support against the camshaft, and use a feeler gauge to measure the space between the gear cover flange and the support bearing.

The clearance between the bearing support thrust face and the camshaft gear must be 0.20 to 0.33 mm [0.008 to 0.013 in].

After measuring the space between the bearing support and the gear cover flange, add an additional 0.20 to 0.33 mm [0.008 to 0.013 in] to that number to determine the thickness of the shims required. Example: Space of 1.52 mm [0.060 in], measured with a feeler gauge, plus 0.25 mm [0.010 in] for clearance will require 1.77 mm [0.070 in] shims.

Use a micrometer to measure the shims removed from the support at the time of disassembly. Add or remove shims as required to obtain the correct clearance between the bearing support and the camshaft gear. Shims are available in the following thicknesses:

Install the required number of shims and a new o-ring on the support bearing.

CAUTION  Do not use lubricating oil on the o-ring. The o-ring will increase in size when in contact with lubricating oil. Use vegetable oil to lubricate the o-ring.

Lubricate the o-ring and install the support bearing into the gear cover.

Tighten the capscrews.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Install the crankshaft pulley. Refer to Procedure 001-022 in Section 1.
• Install the vibration damper. Refer to Procedure 001-052 in Section 1.
• Install the alternator drive belt. Refer to Procedure 013-001 in Section 13.
• Connect the batteries. Refer to the OEM service manual.