Every 60,000 km
Warning: Replace spark plugs only when the engine is cold or slightly warm. If the spark plugs are turned out on a hot engine, the threads of the light metal cylinder head may be damaged.
Order of execution
1. Before starting work, prepare all the necessary tools. Some spark plug manufacturers supply special tools to measure the spark plug gap.
To carry out the work you will need:
- Candle wrench 16 mm, e.g. HAZET 900AKF. HUNDRED AUDI apply for this candle wrench 3122B.
- Additionally, it is recommended to purchase special pliers, for example, HAZET 1849, which make it easier to unscrew the candles. AUDI uses the 3277A assembly key for this.
- 4 spark plugs. Necessary candles are specified in Specifications.
2. The best way to replace spark plugs is to buy new spark plugs in advance, adjust their gap, and replace each spark plug in turn. When buying candles, it is very important to choose exactly those candles that are designed for the engine of your car. Information about them can be found in the Specifications for the Chapter Engine Electrical Systems.
3. With new spark plugs on hand, let the engine cool completely before removing the old ones. During this time, you can inspect new spark plugs for defects and check spark plug gaps.
4. The spark plug gap is checked by inserting a gauge of the desired thickness between the electrodes at the end of the spark plug. The gap must correspond to that specified in the Specifications. The wire should only touch each of the electrodes. If the gap is not correct, slightly bend the bent part of the electrode using a knurled adjuster until the desired gap is reached.
Warning: When adjusting the gap of a new spark plug, bend only the base of the ground electrode without touching its end. If the ground electrode is offset from the center electrode, use the knurled adjuster to align them. Check the porcelain insulator for cracks, indicating that the spark plug needs to be replaced.
5. Switch off the ignition.
6. Engine 1.6 l: Loosen the mounting bolts and remove the engine cover.
7. Engines up to 125 hp: Disconnect plug connections -2 - spark plugs. Note: The illustration shows the engine of another vehicle.
8. Blow out the spark plug recesses, if possible, with compressed air to prevent dirt from getting into the spark plug holes after removing the spark plugs.
9. Engine 1.8 l / 150 hp: Loosen the mounting bolts and remove the engine cover.
10. Disconnect the plug connections of the ignition coils. To do this, pull up the locking brackets.
11. Loosen the ignition coil-to-cylinder head bolts and lift off the spark plugs.
Warning: Visually check the seals between the ignition coils and the cylinder head. Replace parts if damaged.
All engines:
12. Unscrew the spark plugs with the appropriate spark plug wrench. At the same time, pay attention to the fact that the spark plug key does not warp, which can lead to the destruction of the ceramic insulator. Use for the appropriate head, eg. HAZET 900AKF. HUNDRED AUDI apply for this candle wrench 3122B.
Examination
13. Compare the removed spark plug to those shown in the pictures in Chapter 5, this will give you useful information about the general condition of the engine.
14. Check the electrode spacing with a feeler gauge. The AUDI A3 uses spark plugs with three earth electrodes. The required gap value is given in the Specifications.
Warning: New spark plugs usually have the electrode spacing set correctly.
If the spark plug thread is damaged, it must be replaced. To do this, there is a suitable tool and repair kit, in particular BERU. Using a special drill, the old threaded hole can be pierced. The cylinder head does not need to be removed to do this. After that, a new thread can be cut into the cylinder head and a candle is screwed in using a special threaded insert. Threaded inserts sit securely and tightly.
15. To set the distance between the contacts, bend the appropriate ground electrode. To do this, knock on the side of the mass electrode. When bending, rest a small screwdriver on the edge of the thread. Never lean on the center electrode as this can be damaged.
16. Apply a small amount of copper anti-seize compound to the threads of the new spark plug. Install the spark plug in the cylinder head and screw it in with your fingers until it stops, then tighten it with the head of the spark plug wrench. If possible, use a torque wrench to tighten the spark plug to make sure it is installed correctly. Plug tightening torque is included in Specifications.
Warning: To prevent the spark plug from being threaded in, place a small piece of rubber hose or plastic tubing over the spark plug shank. The flexible tube will work as a universal joint, ensuring that the spark plug is aligned with the spark plug socket, and if the spark plug starts to warp, the hose will slip on it, preventing the threads from being stripped.
17. Before connecting to a high-voltage spark plug (BB) wires, inspect it carefully.
18. Connect the wire to the installed new spark plug, again using a twisting motion and holding the connector until it is fully seated over the spark plug.
19. Repeat the above procedure for the remaining spark plugs in sequence to avoid incorrectly connecting the spark plug wires.
20. Engine 1.8 l 150 hp: Install the ignition coils and tighten to 10 Nm. Connect the connectors.
21. Install and screw on the cover.
Visitor comments