Step 1. Although they are fitted hand-tight, most cartridge canisters require a strap wrench to loosen them. If you do not have a wrench, one can be made from a piece of strap wrapped around a socket set e~็tension bar and used to turn the canister. Use a drip tray to catch spilled oil.

*1. On some cars the canister is fitted inverted, and loosen- ing it will spill oil all over the engine. Very little can be done to prevent this, except by removing it quickly and turning it open end upwards. The spill- ed oil can be prevented from soiling the floor with a drip tray.

2. Remove the canister.

3. Wipe the sealing face on the block with a clean cloth.

4. If necessary, fit the new rubber sealing ring to the flange on the inner end of the new cartridge (on most the ring is fixed in place). Lubricate the ring with a smear of engine oil.

5. Screw the filter into position by hand until the ring makes firm contact. Refill the engine with oil, start up (the oil- pressure warning light will stay on a little longer than usual as the filter fills up) and check at the filter for leaks