Attention:
- To avoid burns, it is recommended to remove the spark plugs on a cold engine.
- (2.7L engine) Access to the spark plugs of the right cylinder head is difficult due to the design of the engine (Removal of the intake manifold receiver is required), therefore, it is recommended to install only spark plugs with platinum or iridium electrodes in this cylinder head, since as a result of frequent scheduled inspection and replacement of spark plugs, breakdowns may occur (for example, breakage of the receiver mounting studs).
1. Before removing the spark plugs, perform the following operations:
- A) Remove the engine noise cover (if installed).
Engine 2.7 l.
- b) (2.0L / 2.4L engines, models without noise cover) Remove the central cover of a head of the block of cylinders.
- V) (2.7L engine) To access the spark plugs of the right cylinder head, remove the intake manifold reservoir (see the relevant section in chapter "Intake and exhaust systems").
2. Removing spark plugs.
- A) (2.0L / 2.4L engines) Disconnect the wiring connectors from the ignition coils.
- b) Disconnect the high voltage wires from the spark plugs and ignition coils and remove the spark plug guide tubes with ignition coils as an assembly (engines 2.0 l / 2.4 l).
Attention: when removing and installing wires, you must hold only the rubber end of the wire, and not the wire itself. Improper handling of high voltage wires can cause internal wire breaks.
Note: before removing the wires, mark their relative position so as not to confuse them during installation.
- V) Use a clean rag to remove debris from around the spark plugs that may have fallen into the spark plug mounting holes.
- G) Using a spark plug socket, remove the spark plugs from the cylinder head.
3. Check for burnt electrodes or damage to the spark plug insulator. In addition, check the absence of significant deposits on the center electrode, damage or cracks in the sealing washer, and the condition of the insulator enamel at the end of the candle. If necessary, replace the spark plugs.
Note: The condition of the engine can be judged by the type of deposits on the center electrode insulator:
- If the deposits are dark, then either the air-fuel mixture is too rich or the amount of air in the engine intake is limited.
- If the deposits are light, then either the air-fuel mixture is too lean, or the ignition timing is off, or the spark plug torque is insufficient.
4. (For conventional spark plugs) If soot is present (black electrodes), remove it with a steel brush or a spark plug cleaner (sandblasting). Use compressed air to clean the threaded part of the spark plug from sand.
5. Using a spark plug feeler gauge, check that the gap between the spark plug electrodes is within the specified range.
- Rated value: 1.0-1.1mm
- Limit value: 1.3 mm
Recommended spark plugs:
- Engine 2.0L:
- NGK — BPR6ES-11
- Champion — RN9YC4
- Engine 2.4L:
- NGK — PGR5C-11
- Champion — RN10PYP4
- Engine 2.7L:
- NGK — PFR5N-11
- Champion — RC10PYPB4
- NIPPON DENSO — SK20PR-A8
Note: spark plug marking NGK (or Nippon Denso): first character "R" means a spark plug with platinum electrodes, and "I" or "S" - a candle with iridium electrodes.
For conventional spark plugs.
For spark plugs with platinum or iridium electrodes.
Attention: (For spark plugs with platinum or iridium electrodes)
- Replace the spark plug if the clearance limit is exceeded.
- Do not attempt to adjust the gap on these spark plugs.
- Cleaning these spark plugs can damage the electrode coating. Therefore, use a spark plug cleaner to remove carbon deposits and completely clean the spark plug within 20 seconds or less to avoid damaging the electrode coating. Do not use a wire brush.
6. (For conventional spark plugs) If the gap does not correspond to the nominal value, adjust it by bending the side electrode.
7. Installation of spark plugs.
- A) Clean the spark plug mounting holes.
Caution: Be careful not to allow foreign particles to enter the engine cylinder through the spark plug hole.
- b) Install and tighten the spark plugs to the specified torque.
- Tightening torque - 20-30 Nm
Caution: Exceeding the specified spark plug torque may damage the threads of the spark plug mounting hole in the cylinder head. Overtightening the spark plug can cause it to overheat and damage the engine.
- V) If necessary, apply silicone grease to the spark plug insulators.
- G) (2.0L/2.4L engines) Install the spark plug guide tube assembly with the ignition coils and tighten their mounting bolts to the specified torque.
- Tightening torque 8-12 N.m
- d) Connect high voltage spark plug wires securely to spark plugs and ignition coils.
- e) (2.0L/2.4L engines) Connect the wiring connectors to the ignition coils.
8. After installing the spark plugs, perform the following operations:
- A) (2.7L Engine - Right Cylinder Head) Install the intake manifold reservoir.
- b) (2.0L / 2.4L engines) Establish the central cover of a head of the block of cylinders and tighten bolts of its fastening.
- Tightening torque - 4-5 Nm
- V) Install the engine noise cover.
- Tightening torque - 8-12 Nm