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Cummins 4BT – Camshaft Installation

Apply a coat of Lubriplate 105 to the front camshaft bore.

Lubricate the camshaft lobes, journals and thrust washer with LubriplateTM 105.

Install the camshaft. While pushing in slightly, rotate the camshaft and carefully work the camshaft through the
camshaft bushings. As each camshaft journal passes through a bushing, the camshaft will drop slightly and the
camshaft lobes will catch on the bushings. Rotating the camshaft will free the lobe from the bushing and allow the
camshaft to be installed.

Before the camshaft gear engages the crankshaft gear, check the camshaft for ease of rotation. When installed
properly, the camshaft should rotate freely.

Install the thrust washer, Align the timing marks as illus­trated and finish installing the camshaft.

Install the thrust washer capscrews and tighten to 24 N*m [18 ft-lb].

Verify the camshaft has proper backlash and end play.
A = 0.12 to 0.47 mm [0.005 to 0.018 inch]
B = 0.76 to 0.330 mm [0.003 to 0.013 inch]

Complete the installation of the removed parts.
• Gear cover. Refer to Procedure (7-18).
• Vibration damper. Refer to Procedure (7-15).
• Rocker levers and valve cover. Refer to Procedure (7-03).
• Fuel transfer pump. Refer to Procedure (5-21).

• Operate the engine at idle for 5 to 10 minutes and check for leaks and loose parts.