Land Rover Engine >> CAM CHUCKING NOISE ON 1989-95 3.9L VIN 2

Land Rover Engine >> CAM CHUCKING NOISE ON 1989-95 3.9L VIN 2

Cam Chucking Noise On
1989-95 Land Rover 3.9L VIN 2 Engines

AERA members have reported cam chucking noises on 1989-95 3.9L VIN 2 engines. This noise can be heard on both hot and cold temperature engines and is best observed at a front corner of the engine. The noise is most audible between idle and 2,000 rpm, while engine temperatures are hot. This noise also
increases in frequency as engine speed increases.

The cause of this noise has been determined to before and aft movement of the camshaft. The original design of this engine relies on cam lobe taper to
control slight cam rearward pressure. Engines manufactured mid year during 1995 incorporated a cam button to control camshaft end play movement.

AERA members have reported installing the cam button, Part #CAM1000, and adjusting cam end play to reduce the likelihood of cam chucking noises. To install the button, follow the procedures listed below.

1. Remove old camshaft sprocket bolt and washer and discard.
2. Obtain the revised bolt/button, Part#CAM1000, and new conical washer and carefully install into camshaft. Take care not to damage the nylon thrust control button portion of bolt.
3. Use a deep well socket and torque to 41-44 ft./lbs.
4. Determine the clearance between button and cover by bolting on cover with a new mounting gasket attached. Using a plastic gauge strip will assist here. 5. The desired clearance specification is .005-.010 (.13-.25mm) for camshaft end play. Adjust end play by carefully flat filing the nylon button with a fine toothed flat file. The button/bolt should be mounted in a vise while performing this procedure.
6. Install gasket and front cover mounting bolts and torque bolts to 16 ft/lbs.

The AERA Technical Committee

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