Skoda Felicia

1. Efficiency of return of the power unit considerably depends on serviceability of functioning of spark plugs. It is important that candles on the standard size corresponded to the engine installed on the car (see Specifications). On condition of implementation of the mentioned requirements and serviceability of a condition of the engine of a spark plug will seldom need attention, except the cases of performing procedures stipulated by the schedule of routine maintenance of the car. Need for cleaning of candles arises also extremely seldom, the procedure has to be made only with use of the special equipment in order to avoid risk of damage of working parts of electrodes.
2. Before starting implementation of the procedure wait for full cooling of the engine.

In the absence of factory marking, mark VV of a wire of spark plugs independently by means of an adhesive tape according to numbering of cylinders (with 1 on 4, considering from a GRM drive chain). Disconnect wires from candles (in order to avoid damage of the contact plug pull only for a rubber tip, and not for a wire at all!).

2. By means of a prutkovy key turn out two bolts established under the block with nested heads.

3. Having smoothly pulled forward, remove the coil block from spark plugs.

1. Before removing candles, in order to avoid hit of garbage in cylinders, it is necessary to remove small garbage and dirt from candle niches - clean niches a thin brush, or blow them compressed air (it is possible to use the ordinary bicycle pump).

2. By means of the special key equipped with an elastic insert turn out spark plugs. In order to avoid damage of a carving try not to warp candles during a reversing.

3. The analysis of an external condition of candles can give a lot of useful information about degree of wear of the engine. If the working end of a candle shines and is free from raids and deposits, therefore in combustion chambers too poor air-fuel mix moves, or the candle has excessively high kalilny number (heat removal in a hot candle comes from electrodes less intensively, than in cold).
4. If the working end of a candle and the central internal isolation center are covered with a thick layer of sazhisty deposits, therefore mix is too enriched. The black color of a working part of a candle in a combination to traces of oil testifies to internal wear of the engine, or excessive enrichment of mix.
5. Golden or grayish-brown coloring of a working part of a spark plug is the evidence of the correct configuration of air-fuel mix and good internal state of the engine.
6. In conclusion, make sure of compliance of replaceable candles on a standard size just removed from the engine. In most cases candles have to have a flat saddle and to be equipped with a sealing washer, however, on some engines of the 135th type the candles of conical type used without washers are applied. Installation on the engine of candles of the wrong standard size is inadmissible. In case of lack of confidence in selection of candles address for consultation in service center of the Skoda company.
7. One of the major parameters defining efficiency of sparking of a candle is the size of an interelectrode gap. Nominal rates of candle gaps are specified in Specifications.
8. For installation of an interelectrode gap measure it by means of the special probe, and then extremely accurately turn in a side electrode in the corresponding direction. Do not try to correct at all the provision of the central electrode as it can lead to failure of the internal porcelain insulator that is fraught with the most serious consequences.

9. Correction of a gap should be made by means of special adaptation which is usually mounted on the case of probes of wire type.

10. Before installation of a candle on the engine make sure of density of landing of a contact tip of a shaft. Check also purity of a carving part and external surface of the insulator. Slightly grease a carving with cupriferous lubricant for the purpose of simplification of its reversing next time.

11. Accurately acquire a candle in an opening in a head niche. Profit a candle without distortion in a carving opening of a head of cylinders usually rather difficult. In order to avoid damage of a carving to a body of the head made of soft aluminum alloy it will be most correct to roll a candle for a piece of the fuel hose which is put on its external isolation center. At the same time, in case of a distortion, the hose just will begin to be turned on a candle without any risk of damage of a carving.

12. Remove a hose piece from a shaft of the candle screwed in a head, then hold on a candle with the required effort by means of a dynamometer key.

In the absence of near at hand dynamometer key tighten a candle against the stop a hand, then tighten a quarter more of a turn a candle key. In a similar manner install all remained spark plugs on the engine.

13. On the models equipped with the distributor of ignition connect to wire VV candles according to marking, then return into place the top cover of the engine.
14. On models without distributor install the ignition coil block, working as it should be, the return described above. Tighten bolts of fastening of the block of the coil with the required effort.