Notice: It is important to check the gap of all new and reconditioned spark
plugs before installation. Pre-set gaps may have changed during handling.
Use a round wire feeler gauge to be sure of an accurate check, particularly
on used plugs. Installing plugs with the wrong gap can cause poor engine performance
and may even damage the engine.
- Gap the spark plugs to the specifications. Refer to
Ignition System Specifications
.
Notice: Be sure plug threads smoothly into cylinder head and is fully seated.
Use a thread chaser if necessary to clean threads in cylinder head. Cross-threading
or failing to fully seat spark plug can cause overheating of plug, exhaust
blow-by, or thread damage. Follow the recommended torque specifications carefully.
Over or under-tightening can also cause severe damage to engine or spark plug.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or
corrosion inhibitors on fasteners or fastener joint surfaces unless specified.
These coatings affect fastener torque and joint clamping force and may damage
the fastener. Use the correct tightening sequence and specifications when
installing fasteners in order to avoid damage to parts and systems.
- Install the spark
plugs to the engine.
Tighten
Tighten the spark plugs to 15 NĀ·m (11 lb ft).
- Install the spark plug wires to the spark plugs. Refer to
Spark Plug Wire Replacement
.
- If you are replacing the engine right bank (rear) spark plugs,
perform the following steps: