Spark Plug: Testing and Inspection
REMOVAL1. Twist and pull to remove ignition wire from plug.
2. While wearing saftey glases, use compressed air to blow out debris from plug well.
3. Using a 5/8" (16mm) socket, remove plug.
CAUTION: Use care not to allow foreign matter to enter through plug holes.
INSPECTION
1. Check spark plugs for:
^ Broken insulator
^ Worn electrode
^ Carbon deposits
^ Damaged or broken gasket
^ Burnt condition of porcelain insulator at spark gap.
NOTE: Dark deposits indicate too rich a fuel mixture. Light (white) deposits indicate too lean a fuel mixture, advanced ignition timing or insufficient plug tightening
2. Check plug gap and adjust to 0.039 - 0.043in (1.0 - 1.1mm).
INSTALLATION
1. Adjust electrode gap to 0.039 - 0.043 in (1.0 - 1.1 mm).
2. Lightly coat threads of plug with anti-seize compound.
3. Install and thread plug into cylinder head by hand.
4. Torque spark plug to 14 - 22 ftlb (20 - 29 Nm).
5. Apply dielectric compound to the inside of ignition wire boot and install. A slight click will be heard when wire is properly connected.
6. Tighten spark plug to specified torque. Overtorqueing may damage cylinder head threads.
RECOMMENDED SPARK PLUGS
BRAND PART NO.
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NGK BPR6ES-11
NIPPONDENSO W20EPR-U11
CHAMPION RC9YC-4