Jaguar Technical Service Bulletin: Rattle After Start - Upper Timing Chain - Install Revised Tensioner.pdf
Some vehicles with AJ6 or AJ16 engines may exhibit engine noise immediately after a cold or hot start. This noise has been identified as relaxation of the upper (secondary) timing chain tensioner resulting in temporary chain slack.
A non-return valve in the tensioner is designed to trap pressurized engine oil to maintain tension on the timing chain to prevent rattling. If the oil bleeds past the piston in the tensioner, the tension on the upper timing chain is temporarily lost. When the engine is then started, the chain will rattle until oil pressure builds up and recharges the tensioner (at which point the rattle will stop.)
A revised tensioner with an integral oil reservoir has been introduced to overcome this condition starting with the following engine numbers: 4.0L NA 9J160552 & 4.0L SC 9K160558.
Download free Jaguar Technical Service Bulletin: Rattle After Start - Upper Timing Chain - Install Revised Tensioner.pdf (3 pages pdf file, 0.1 MB).
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