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.
1990 Jaguar XJ6 BaseFACTORY OEM SERVICE PROCEDURE
Engine Compression
COMPRESSION SPECIFICATIONS
| Application | Specification | |||||||
|---|---|---|---|---|---|---|---|---|
| Compression Ratio | ||||||||
| XJS | 11.5:1 | |||||||
| XJ6 | 9.5:1 | |||||||
| Compression Pressure (1) | ||||||||
| XJS | 200-220 psi (14.1-15.5 kg/cm2 ) | |||||||
| XJ6 (2) | 150-160 (10.5-11.2kg/cm2 ) | |||||||
| XJ6 (3) | 160-170 (10.5-11.2kg/cm2 ) | |||||||
| Maximum Variation Between Cylinders | ||||||||
| XJS | 35 psi (2.4 kg/cm2 ) | |||||||
| XJ6 | 10 psi (.70 kg/cm2 ) | |||||||
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Factory Service Tools
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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.
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