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 DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSPECIFICATIONSMECHANICAL SPECIFICATIONS
1991 Jaguar XJ-6 L6-4.0L
Mechanical Specifications
1991 Jaguar XJ-6 L6-4.0LSECTION Mechanical Specifications
FIRING ORDER 1-5-3-6-2-4
SPARK PLUG GAP 0.035 in (0.9 mm)
SPARK PLUG TYPE Champion RC9YC
ROAD SPEED SENSOR AIR GAP 0.002 - 0.035 in (0.5 - 0.9 mm)
IDLE SPEED
Cold in "N" 800 rpm
Cold in "D" 650 rpm
Hot in "N" 700 rpm
Hot in "D" 580 rpm
TORQUE VALUES
Oxygen Sensor 36 - 44 ft lb (50 - 60 Nm)
Spark Plugs 17 - 21 ft lb (23 - 28 Nm)
Coolant Temperature Sensor 36 - 40 ft lb (49 - 54 Nm)
Crank Pulley To Crankshaft 150 ft lb (203.5 Nm)
A/C Pulley To Damper 17 - 20 ft lb (23 - 27 Nm)
Alternator Pivot Nut And Bolt 17 - 20 ft lb (23 - 27 Nm)
Timing Ring To Damper 12 - 14 ft lb (16 - 19 Nm)
SPARK PLUG GAP 0.035 in (0.9 mm)
SPARK PLUG TYPE Champion RC9YC
ROAD SPEED SENSOR AIR GAP 0.002 - 0.035 in (0.5 - 0.9 mm)
IDLE SPEED
Cold in "N" 800 rpm
Cold in "D" 650 rpm
Hot in "N" 700 rpm
Hot in "D" 580 rpm
TORQUE VALUES
Oxygen Sensor 36 - 44 ft lb (50 - 60 Nm)
Spark Plugs 17 - 21 ft lb (23 - 28 Nm)
Coolant Temperature Sensor 36 - 40 ft lb (49 - 54 Nm)
Crank Pulley To Crankshaft 150 ft lb (203.5 Nm)
A/C Pulley To Damper 17 - 20 ft lb (23 - 27 Nm)
Alternator Pivot Nut And Bolt 17 - 20 ft lb (23 - 27 Nm)
Timing Ring To Damper 12 - 14 ft lb (16 - 19 Nm)
RENDER: 1.0x
NO RELATED
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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.