XJ-8 Sedan (X308) V8-4.0L (AJ27) (1999)
Drive Belt Tensioner: Description and Operation
Drive Belt Automatic Tensioner
Belt tension is achieved by an automatic tensioner; neither the belt nor the tensioner require service apart from checking the belt wear indicators at each
normal service interval.
The minimum service life of the drive belt is 100,000 miles.
Never apply oil to the belt or to the belt tensioner.