Jeep Grand Cherokee

1993-1999 of release

Repair and car operation

Replacement of spark plugs (each 48 000 km (30 000 miles) run, or times in two years)

Open a cowl and mark candle wires for a guarantee of their correct connection at assembly.

In most cases the number of spark plugs of tools necessary for replacement includes the candle head equipped with a soft insert of the employee for prevention of damage of a porcelain insulator of a candle complete with a ratchet drive and a set of collars and extension pieces, and also the tool for measurement and adjustment of candle gaps. Special tools for safe removal of tips of candle wires from shafts of candles Besides, are issued, however use of this tool is not an indispensable condition of performance of procedure. The dinamometrichesky key is necessary for a tightening of new candles.

Tools necessary for work of replacement of spark plugs.

1 — the Candle head - Is equipped with the special soft insert serving for protection against damage of a porcelain insulator of a candle
2 — the Dinamometrichesky key - Though is not absolutely necessary tool, its use extremely is desirable at implementation of a tightening of new candles with demanded effort
3 — the Ratchet drive - Represents the standard metalwork tool applied to work with replaceable face heads
4 — the Extension piece - Depending on model and the car equipment auxiliary units, can be necessary for a vyvinchivaniye of candles application of a various configuration of the extension pieces equipped with kardanny hinges
5 — the Tool for measurement and adjustment of candle gaps - Is issued a wide range of a various design of such tools. Make sure available щупа thickness demanded for your car

The best approach to performance of this procedure of service of the car is acquisition of new candles beforehand. After implementation of adjustment of gaps of a candle it is necessary to replace on one (passing to a vyvinchivaniye old the second after installation new the first etc.). Upon purchase of new candles pay special attention to compliance of their standard size to technical characteristics of the engine of your car. Necessary information can be found on information шильде systems of decrease in toxicity of the fulfilled gases of the car (VECI), located under a cowl, in the operation manual on the car or in Specifications to this Chapter. At different interpretations always it is necessary to give preference to VECI data.

PERFORMANCE ORDER

Before starting removal of candles, wait complete cooling of the engine. Use time necessary for this purpose for check of a condition and adjustment of gaps of new candles.
Measurement of a candle gap is made by introduction between electrodes of a candle of a working part щупа the demanded thickness. The size of a gap should correspond to VECI data. Shchup should slip between electrodes only with insignificant resistance. If the gap demands adjustment, use built in in a measuring instrument body a regulator for a podgibaniye of a lateral electrode. If the lateral electrode is located not precisely over central, correct it by means of the same regulator. Check a surface of a porcelain insulator of a candle on existence of cracks (in case of detection of those replace a candle).

Manufacturers of spark plugs recommend to use for measurement of an interelectrode gap shchupy wire type - if щуп does not slip between electrodes with easy resistance, carrying out adjustment of a gap is required.

For adjustment of a gap turn in a lateral electrode respectively in one of the directions specified by shooters, operating extremely carefully not to damage surrounding central electrode a porcelain insulator.

After cooling of the engine remove a wire from the first spark plug. Pull only for a tip, and at all for a wire. It is desirable to use the special tool (see the item. "In most cases"...).

At removal of a wire from a spark plug pull only for its tip, turning it thus.

If there is a source of the compressed air, use it for blowing from a candle niche of extraneous particles. For this purpose can be suitable and the ordinary bicycle pump not worse. A problem of this procedure is not to allow hit in the cylinder through a candle opening of garbage after candle removal.
Put on a candle a candle head and unscrew a candle from the engine, rotating it counter-clockwise.
Check a candle condition at the help of the card of conditions of spark plugs [it should be inserted somewhere into the Management]. The external condition of a candle can give important information about about the general condition of the engine.
Screw one of the prepared new candles in an opening by hand against the stop, then tighten it by means of a dinamometrichesky key (if that is available) or a ratchet drive. Good idea at a nazhivleniye of a candle will put on its shaft a piece of a fuel hose and to rotate a candle for it. It will allow to avoid carving damage in case of a candle perekashivaniye at installation it in an opening as the hose at increase of resistance will start to slip.
Before installation of a tip of a wire on a shaft of a candle check carefully its condition according to Section instructions Check of a condition of candle wires, covers and a distributor begunka (each 48 000 km (30 000 miles) run, or times in two years).
Connect a wire to a new candle, again making rotary progress by a tip before complete landing it on a candle.
Repeat procedure for the remained candles, replacing them serially in order to avoid the wrong connection of wires.