Skoda Felicia

1. Efficiency of return of the power unit appreciably depends on serviceability of functioning of spark plugs. It is important, that candles on the standard size corresponded to the engine established on the car (Specifications see). Under condition of performance of the mentioned requirements and serviceability of a condition of the engine of a spark plug will seldom require attention, except cases of performance of the procedures stipulated by the schedule of routine maintenance of the car. Necessity in зачистке candles arises also extremely seldom, procedure should be made only with application of the special equipment in order to avoid risk of damage of working parts of electrodes.
2. Before to start procedure performance wait full cooling of the engine.

In the absence of factory marks, mark ВВ wires of spark plugs independently by means of an adhesive tape according to numbering of cylinders (with 1 on 4, considering from a chain of drive ГРМ). Disconnect wires from candles (in order to avoid damage of the contact plug pull only for a rubber tip, and at all for a wire!).

2. With the help пруткового a key turn out two bolts established under the block with nested heads.

3. Smoothly having pulled forward, remove the block of the coil from spark plugs.

1. Before to remove candles, in order to avoid dust hit in cylinders, it is necessary to remove small dust and a dirt from candle niches - clean niches a thin brush, or blow their compressed air (it is possible to take advantage of the usual bicycle pump).

2. By means of the special key equipped with the elastic loose leaf, turn out spark plugs. In order to avoid carving damage try not to warp a candle during a reversing.

3. The analysis of an external condition of candles can give a lot of helpful information on degree of deterioration of the engine. If the working end of a candle shines and is free from touches and adjournment, hence in combustion chambers too poor air-fuel mix moves, or the candle has excessively high калильное number (heat removal from electrodes in a hot candle occurs less intensively, than in cold).
4. If the working end of a candle and the central internal insulator are covered by a thick layer сажистых adjournment, hence the mix is too enriched. Black окрас a working part of a candle in a combination to oil traces testifies to internal deterioration of the engine, or excessive enrichment of a mix.
5. Golden or serovato-brown colouring of a working part of a spark plug is the certificate of correct configuration of an air-fuel mix and good inwardness of the engine.
6. In summary, make sure of conformity of replaceable candles on a standard size just removed from the engine. In most cases candles should have a flat saddle and to be equipped by a sealing washer, however, on some engines of 135th type candles used without washers конусного type are applied. Installation on the engine of candles of a wrong standard size is inadmissible. In case of absence of confidence of selection of candles address for consultation in company Skoda service-centre.
7. One of the major parametres defining efficiency искрообразования of a candle is the size of an interelectrode backlash. Rating values of candle backlashes are resulted in Specifications.
8. For installation of an interelectrode backlash measure it by means of special probeа, and then extremely accurately turn in a lateral electrode in a corresponding direction. Do not try to correct at all position of the central electrode as it can lead to failure of an internal porcelain insulator that is fraught with the most serious consequences.

9. Backlash updating should be made by means of the special adaptation which is usually mounted on the case probeов wire type.

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

11. Accurately acquire a candle in an aperture in a head niche. Наживить a candle without a warp in a carving aperture of a head of cylinders it is difficult usually enough. In order to avoid damage of a carving to a body of the head made of a soft aluminium alloy will roll most correctly a candle for a piece of the fuel hose which has been put on its external insulator. Thus, in case of a warp, the hose simply will start to be turned on a candle without any risk of damage of a carving.

12. Remove from a shaft of the candle screwed in a head a hose piece, then hold on a candle with demanded effort with the help динамометрического a key.

At absence near at hand динамометрического a key tighten a candle against the stop a hand, then tighten still a turn quarter a candle key. In a similar manner establish on the engine all remained spark plugs.

13. On the models equipped with the distributor of ignition connect to candles ВВ of a wire according to marks, then return into place the top cover of the engine.
14. On models without the distributor establish the block of the coil of ignition, operating in an order, the return described above. Tighten bolts of fastening of the block of the coil with demanded effort.