Note: Depending on the engine type, either conventional spark plugs or spark plugs with platinum-coated electrodes are installed.
Conventional spark plug type
- If necessary, the gap can be adjusted by bending the side electrode.
- Spark plugs can be cleaned with a wire brush or sandblasted.
Spark plugs with platinum-coated electrodes
- Never use a wire brush to clean this type of spark plug.
- Never attempt to adjust the gap on a used spark plug.
- Spark plugs should be replaced every 100,000 km of vehicle mileage.
- The gap of a new spark plug must be adjusted by bending only the side electrode at the base, without touching the central electrode.
1. Check the spark plug electrodes.
If you have a megohmmeter, measure the electrical resistance of the insulator.
- Nominal resistance - not less than 10 MOhm
If the resistance is less than the permissible value, clean the spark plug.
In the absence of a megohmmeter
- a) Quickly increase the engine speed to 4000 rpm five times.
- b) Remove the spark plugs (see above).
- c) Visually assess the condition of the spark plug.
If the electrodes are dry, the test can be completed.
If the electrodes are wet, then you need to move on to the next step.
2. Disconnect the high-voltage wires from the spark plugs.
3. Remove the spark plugs using a spark plug wrench.
4. Visually inspect the spark plugs for wear of the electrodes, damage to the threads and/or insulator. Replace the spark plugs if necessary.
Recommended spark plugs:
4A-FE, 7A-FE
- ND — PK20R13
- NGK — BKR6EP13
5A-FE
- ND — K16R-U11
- NGK — BKR5EYA11
3S-FE, 4S-FE
- ND — K20R-U11
- NGK — BKR6EYA11
5. Check the gap between the electrodes.
5A-FE, 3S-FE, 4S-FE:
- Nominal clearance - 1.0-1.1 mm
- Maximum gap - 1.3 mm
4A-FE, 7A-FE:
- Nominal clearance - 1.2-1.3 mm
- Maximum gap - 1.5 mm
7. Clean the spark plugs.
If the electrodes have traces of wet carbon deposits, dry them and then remove them with a suitable solvent. If the electrodes have traces of oil, remove them first with gasoline.
Then clean the spark plugs using a spark plug cleaner, applying air at a pressure of no more than 588 kPa (6 kg/cm²) for no more than 20 seconds.
8. Replace the spark plugs and tighten them.
- Tightening torque - 18 Nm
9. Connect the high-voltage wires to the spark plugs.