Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJAGUAR1991XJ-6 L6-4.0LREPAIR AND DIAGNOSISMAINTENANCETIMING COMPONENT ALIGNMENT MARKSLOCATIONS
1991 Jaguar XJ-6 L6-4.0L
Timing Component Alignment Marks: Locations
1991 Jaguar XJ-6 L6-4.0LSECTION Locations
Timing Component Alignment Marks
To place the Jaguar 4.0L or 3.6L engine "in time" the No. 1 cylinder must be at TDC and the timing notch on each camshaft must align with service tool 18G 1433A. When these conditions are met the engine is said to be "in time".
NOTE: Jaguar does not provide precise timing marks for the engine. Correct engine timing is achieved when the above conditions are met. Refer to Camshaft : Service and Repair
Service and Repair
CAUTION! Incorrect setting/installation without the use of special tools could damage or break the camshafts. Valves could also be bent through contact with the piston crowns. Always note installation instructions and use specified special tools, procedures, and sequences.
To place the Jaguar 4.0L or 3.6L engine "in time" the No. 1 cylinder must be at TDC and the timing notch on each camshaft must align with service tool 18G 1433A. When these conditions are met the engine is said to be "in time".
NOTE: Jaguar does not provide precise timing marks for the engine. Correct engine timing is achieved when the above conditions are met. Refer to Camshaft : Service and Repair
Service and Repair
CAUTION! Incorrect setting/installation without the use of special tools could damage or break the camshafts. Valves could also be bent through contact with the piston crowns. Always note installation instructions and use specified special tools, procedures, and sequences.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.