Jaguar XK AJ26/AJ27 Timing Chain Tensioner Repair

Our timing chain tensioner repair for the Jaguar AJ26 and AJ27 V8 engines (fitted to the X100 XK8 and XKR) is a comprehensive timing system overhaul. The service addresses the entire timing assembly, including:

• Primary and secondary timing chains - replaced with upgraded chains featuring forged rollers.
• Chain guides - both straight and curved guides are replaced with metal-backed versions.
• Primary and secondary tensioners - early plastic-bodied tensioners are upgraded to metal-bodied units (with shorter bolts where required).
• Oil sump removal - to inspect for and remove any debris from worn guides.
• Gaskets and seals - new valve cover gaskets, timing cover seals, and crankshaft oil seal are fitted.

We offer two approaches depending on the condition of the engine:

• Secondary tensioner replacement - using the “zip-tie method” without disturbing the primary timing (suitable when only upper tensioners are worn).
• Full timing system replacement - covers all chains, guides, and tensioners, requiring front cover removal and full timing tooling.

Every repair includes a manual rotation check and a road test to verify correct timing and engine performance.

This repair applies to the following Jaguar models and engine codes. Click through for detailed information on each.

• Specialist V8 experience - we have rebuilt and repaired hundreds of AJ-V8 engines.
• Factory-spec tooling - we use the correct camshaft locking tools and tensioner wedges.
• Upgraded components - we fit metal-bodied tensioners and forged-roller chains.
• Transparent pricing - fixed-price quotes with no hidden costs.
• 12-month unlimited-mileage warranty on all our work.
• Learn more about our workshop

• Jaguar Engine Inspection & Assessment
• Jaguar Engine Rebuild
• Jaguar V8 Supercharged Timing Chain Repair (AJ133/AJ126)
• Inside Our Workshop
• Jaguar Engine Rebuild Process