Spark Plugs

Spark Plugs SPARK PLUG REMOVE & REFIT

Spark plug removal

1. Disconnect the battery - ensuring that all text and cautions in the relevant section of the handbook (see ‘BATTERY SAFETY’, page215) are observed.

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2. Release 4 Allen head turnbuckles and remove the acoustic cover, see above. 3. Working on one side of the engine, remove 2 bolt access covers from the ignition coil covers and remove the bolts beneath them.

4. Remove the ignition coil cover. 5. Remove 2 bolt spacers from the ignition coil covers. 6. Repeat steps 3 to 5 for the other side of the engine.

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7. Remove 2 nuts and disconnect the wiring harness and camshaft cover earth leads. 8. Disconnect 8 multiplugs from their ignition coils by pulling up each metal locking clamp. 9. Discard both ignition coil cover gaskets. 10. Remove 14 nuts securing the ignition coils. 11. Pull out 8 ignition coil units.

12. Clean the area around each spark plug and, using a suitable spark plug wrench, remove 8 spark plugs.

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Fitting new spark plugs

When fitting new spark plugs, take care not to cross-thread a plug, otherwise costly damage to the cylinder head will result. Only fit plugs of a type recommended by Land Rover (see ‘V8 ENGINE’, page273). Please note that fitting incorrect grades of plug may lead to engine failure and serious damage. 1. Fit 8 new spark plugs and tighten to a torque of 23 lbf.ft (31 Nm). 2. Fit an ignition coil to each plug. 3. Fit 14 nuts securing the ignition coils and tighten them to 3 lbf.ft (4 Nm). 4. Fit 2 new ignition coil cover gaskets 5. Connect each multiplug to its ignition coil and lock in position by pressing down each locking clamp. 6. Reposition the wiring harness and camshaft cover earth leads, fit the remaining 2 nuts and tighten to 3 lbf.ft (4Nm). 7. Fit 2 bolt spacers to each ignition coil cover. 8. Fit both ignition coil covers, tighten the bolts and refit the 4 bolt access covers. 9. Refit the engine acoustic cover. 10. Reconnect the battery.