Spark Plug: Testing and Inspection

SPARK PLUG INSPECTION [13B-MSP]

Specification

Spark plug type
- Leading side: N3H5 18 110A (RE7C-L)*1, N3Y8 18 110A (RE7C-L)*1, N3Y9 18 110A (RE6C-L)*2
- Trailing side: N3H1 18 110D (RE9B-T)*1, N3Y1 18 110A (RE9B-T)*1

*1
Standard equipment
*2
Hot type plug: Available only for customers who often drive their car at very low speed which causes the plugs to foul easily.

Plug Gap Inspection

CAUTION:
1 To avoid possible damage to the tip, do not adjust the plug gap.

1 To prevent damaging the tip, use a wire type plug gap gauge when inspecting the plug gap.

1. Measure the spark plug gap using a wire type plug gap gauge.
1 If it is more than the maximum specification, replace the spark plug.

Standard spark plug gap
- 1.15-1.25 mm {0.046-0.049 in}

Maximum spark plug gap
- Leading side: 1.5 mm {0.059 in}
- Trailing side: 1.4 mm {0.055 in}

Cleaning

CAUTION:
1 To avoid possible damage to the spark plug tip, do not use a wire brush for cleaning.

NOTE:
1 To avoid possible damage to the tip, use gasoline to clean the spark plugs after removing dirt.

Visual Inspection

1. Inspect the following items:






- If any of the following malfunctions are indicated, replace the spark plug.

- Insulator breakage
- Worn electrode
- Damaged gasket
- Badly burned insulator (sparking side)

Resistance Inspection

1. Measure the resistance of the spark plug using a tester as shown in the figure.






- If not within the specification, replace the spark plug.

Spark plug resistance [25°C {77 °F}]
- 3.0-7.5 kilohms