Discovery I (LJ) V8-3.9L (1994)
Camshaft: Technical Service Bulletins
Engine - Camshaft Knock
10/2/95
12/02/95/US
SUBJECT:
Camshaft Knock
MODEL:
Range Rover Classic Discovery
AFFECTED VEHICLES:
1994 and 1995 Model Year Discovery up to LJ 137600
1995 Model Year Range Rover Classic 3.9 up to LH 660001
DETAIL
Land Rover Engineering has developed a service procedure to repair a diagnosed camshaft knock on '94 and '95 MY Discovery and '95 MY Range
Rover Classic 3.9 engines (Serpentine belt drive system engines). Vehicles built after the above VIN numbers have a "keeper plate" to prevent cam
knock occurring.
ACTION REQUIRED
Upon customer complaint only, follow procedure below.
PARTS INFORMATION
CAM1000 - Cam Button
Order necessary fluids/gaskets for a front cover gasket replacement.
PROCEDURE
To properly diagnose a camshaft knock ensure the following procedures are completed.
The engine must reach normal operating temperature. Run the engine at approximately 2000 rpm for 2 - 3 minutes to ensure lifters are properly primed.
Finally allow engine to idle. Ensure that the symptom is not a result of contamination of the drive belt (undercoating on belt and/or pulleys). It is
necessary to remove the drive belt and run engine briefly to assist in the diagnosis. If the knocking/tapping noise is eliminated when the belt is removed,
then the noise is being generated from the ancillary drive system, and not the camshaft.
If camshaft knock is diagnosed then proceed with the following installation instructions on page 2.
WARRANTY
COMP.CODE: 1S2K
SRO: 12.65.89/26 - Fit cam button - 3.40 hrs