Carry out removal and installation of spark plugs in the following order:

– for removal of spark plugs, open a cowl and remove high-voltage wires from candles. On DOHC engines for removal of high-voltage wires there is a special tool. Install the special tool on a candle tip and pull up;

PREVENTION Using compressed air, remove dirt from installation sites of candles that it after an otvorachivaniye of candles did not get to cylinders.

– turn out candles;

– check of spark plugs shows a condition of the engine. If the nasal part of the isolation center of a spark plug pure and white, it shows that mix too poor or "hot" spark plugs are used;

– if the tip and a nasal part of the isolation center are covered with a firm black raid, it shows that mix too rich. If black and oil probably that the engine is worn-out and oil in a large number gets from a case to the combustion chamber;

– if the nasal part of the isolation center is covered with an easy light brown raid, then mix is optimum, and it is probable that the engine in good shape. The probe to check an inter-electrode gap of a spark plug;

– the gap between electrodes of a spark plug is important as at too big or too small gap sparking will be insufficiently for normal operation of the engine;

– for installation of a gap turn in an external electrode before receiving the required gap. Not to bend at all the central electrode as it can split the insulator;

– carefully wipe a carving part of a candle;

– a hand screw a spark plug, having excluded its distortion to a contact with a head of the block of cylinders and tighten it the required moment;

Fig. 6.28. Check resistance of high-voltage wires

– high-voltage wires do not require attention except that they need to be kept clean. Remove high-voltage wires and check their resistance (fig. 6.28) ;

– at removal of a cover of the distributor, carefully wipe it and check a condition of electrodes. Check coal contact in the center of a cover.