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Fitting Spark Plugs

  • Check the owner's manual for your car (or any appliance with spark plugs) to find out the recommended gap setting.
  • Use a gap tool (feeler gauge) to check the gap of the spark plug. Slip the tool between the ground electrode and center electrode. The gap tool should fit snugly at the recommended gap width indicated on the tool.
  • Push the tool between the electrodes a few times to ensure proper gap. If the gap is too wide, push the ground electrode firmly against a flat surface to narrow the gap and then check again with the gap tool.
  • Repeat as necessary until you reach the correct gap.
  • Important note: Iridium Spark Plugs have a thin centre electrode and can be damaged easily. Extra care must be taken when adjusting the gap.

 

Spark Plug Gap Unit Conversion

millimeters inches
0.4 .016
0.5 .020
0.6 .024
0.7 .028
0.8 .032
0.9 .035
1.0 .039
1.4 .055
1.5 .059
1.6 .063
1.7 .067
1.8 .071
1.9 .075
2.0 .079



Fitting Spark Plugs

Gasket type plugs
Install spark plug manually by hand first, then tighten about 1/4 - 1/2 turn with plug wrench.
Gasket Seat Type Plugs

Taper seat plugs
Install spark plug manually by hand first, then tighten about 1/16 turn with plug wrench.
Taper Seat Type Plugs