Under normal circumstances, different faults of automobile engine will be directly related to the problems of a certain part; For example, engine jitter generally has a great relationship with the ignition system, oil circuit, gas circuit or mechanical aspects, but sometimes engine failure is not a problem caused by a component, but other parts caused by the problem, the induced fault is often easy to make people wrong.
A few days ago, a Mazda 6 ran nearly 100,000 kilometers to the 5 elder brother shop, according to the owner of the master said; His car recently appeared jitter phenomenon, especially in the rapid acceleration of the vehicle will appear obvious feeling of frustration, the owner of the master suspected that there is a problem with gasoline recently; A five-mile test found that the problem was in the ignition system and not in the gasoline being filled.
The Mazda6 is powered by a General Motors engine, the same model as the Classic Focus, that has four ignition coils, which are significantly more efficient than the previous cylinder wires, but are significantly more expensive.
In 5 elder brother to its ignition coil check, found that the fourth cylinder on the ignition coil head oil stains, according to the normal bit should not have oil stains appear, if there is oil means that there must be oil leakage, this time it needs timely treatment.
So where is the oil leaking here? Our owners need to know that there is oil on the ignition coil, which is generally caused by hard oil leakage caused by aging valve chamber pad. When the valve chamber pad leakage is serious, the spark plug and ignition coil will be screwed on the cylinder block and soaked up; Because the oil is insulated, the spark plug electrode is all dipped in the oil, then the resistance between the ignition coil and the spark plug increases sharply, which will cause the spark plug ignition difficulties or ignition sparks smaller, making the combustion of the engine gasoline mixture worse, to the engine caused by the lack of cylinder shaking phenomenon is inevitable.
The reason for the vehicle shaking the owner master roughly understand, and agreed to replace the valve chamber cushion, then 5 elder brother will remove the valve chamber cover of the car, from the picture below can see that the owner master usually on the engine maintenance is OK, and there is no large amount of oil in it.
When the valve chamber cushion on the valve chamber cover was removed, it was found that the rubber gasket had become very stiff under the high-temperature roasting of the engine for a long time. According to previous repair cases, the oil leakage of valve chamber cover cushion of most models is caused by the aging and loss of elasticity of the gasket, because the oil leakage of valve chamber cushion leads to other faults of not a few cars, fortunately, the owner of the master found early, did not cause more serious problems.
About half an hour of time 5 elder brother will be installed on the new valve pad, because the valve room pad oil leakage is not caused by a day and a half, so at the moment after the car and no leakage phenomenon, let the owner of the master run for a period of time and then come to review the results, but before the engine shake and acceleration of the frustration problem has disappeared, which makes the owner of the master is still very satisfied, The whole maintenance process and knowledge points we owners can simply understand.