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Jaguar Technical Service Bulletin: Rattle After Start - Upper Timing Chain - Install Revised Tensioner.pdf

October 11, 2008 · Filed Under Jaguar  · Tags: , ,

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.

This manual is available FREE at European Transmissions website, we merely collect the information, we are neither affiliated with the author(s), the website and Jaguar brand nor responsible for its content and change of content. (Read our disclaimer here or here before you download the document from the website written above by clicking the below link).

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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