REMOVAL & INSTALLATION
To avoid engine damage, do not remove spark plugs when the engine is warm; the spark plug threads may be stripped if removed on a hot engine. When you're removing spark plugs, you should work on one at a time. Don't start by removing the plug wires all at once, because unless you number them, they may become mixed up. Take a minute before you begin and number the wires with tape. The best location for numbering is near where the wires come out of the cap.
- Disconnect the negative battery cable.
- Use a small prying tool to remove the heat shields on the rear cylinders.
- Remove the first spark plug cable by twisting the boot half a turn, then pulling up. Then remove the spark plug.
- All engines used AC Type R45lts6 spark plugs until an updated non-ridged spark plug was introduced in February, 1992, designated 41-600 (this number may change at any time). Properly gap to 0.060 inch (1.5mm) prior to installation.
- Lubricate the threads lightly with penetrating oil and install the spark plug. Torque to 20 ft. lbs. (27 Nm) for 1990-91 engines and 12 ft. lbs. (16 Nm) for 1992-93 engines. Install the cable to the plug and snap it in place.
- When installing the heat shields, make sure they are seated against the bump stop and the lower tabs extend over the spark plug's hex.
- Repeat for the remaining spark plugs.
- Connect the negative battery cable.