XK-8 Coupe (X100) V8-4.0L (AJ26) (1998)
Timing Chain Tensioner: Customer Interest
Engine - Rattle Noise on Start Up
303-30
DATE
12/98
V8 XJ Series/XK8
MODEL
1997-99 MY XK8 Range
1998-99 MY V8 XJ Series
VIN
Refer to engine
no. in text
Noise During Start Up - Install Revised Timing Chain Tensioners
Issue:
Some vehicles within the above VIN range may experience a rattling noise when the engine is started. This noise may be caused by the secondary timing
chain tensioners. Research has shown that a noise can originate at the chain tensioners to cause a resonance in another part of the engine.
A revised, spring assisted, secondary timing chain tensioner has been introduced to eliminate this concern, commencing at engine No. 98102106XX.
Introductory VINs are not yet available. In case of a customer complaint, the revised tensioners may be installed on earlier V8 engines.
Action:
In case of a customer complaint of start up noise, determine if the noise is caused by the secondary timing chain tensioners. If the secondary timing chain
tensioners are the cause of the noise, they should be replaced by the revised tensioners (Illustration 1).
^
The revised tensioner has a coil spring that presses on the piston head to provide a damping effect.