What happens if the exhaust exhaust valve clearance is too large or too small?

The engine exhaust valve mechanism directly determines the performance of the engine, and the exhaust valve in the entire exhaust valve mechanism is a vital component, so when the exhaust valve clearance changes, the engine performance will be biased.

This article contains the following:

• What happens if the exhaust valve clearance is too large or too small

• The reason why the exhaust valve clearance becomes larger

• The reason why the exhaust valve clearance becomes smaller

• The reason why the exhaust valve clearance has not changed

• The reason why the exhaust valve clearance is large and small

1.What happens if the exhaust valve clearance is too large or too small

If the exhaust valve clearance is too large, the opening of the intake and exhaust exhaust valves is delayed, and the closure is advanced, shortening the intake and exhaust time, the exhaust valve opening is reduced, the normal exhaust valve phase is changed, and the engine intake is insufficient. Air is not clean, which leads to a decrease in engine power. At the same time, it also causes collisions between various parts of the exhaust valve mechanism to generate noise and increase wear.

If the exhaust valve clearance is too small, when the exhaust valve and other parts are heated and expanded, it will cause the exhaust valve to close tightly or fail to close, resulting in air leakage, which will cause the engine to work abnormally, the power will drop, and the sealing surface of the exhaust valve will be seriously burned.

2. The reason why the exhaust valve clearance becomes larger

The increased exhaust valve clearance is due to the wear of these parts caused by the wear of the camshaft, tappet, tappet, exhaust valve small head, and rocker arm. The coordinated position of these parts has been displaced. Between the ends, the exhaust valve gap formed becomes larger.

3. The reason why the exhaust valve clearance becomes smaller

It is not common for the exhaust valve clearance to become smaller. It usually appears after replacing the exhaust valve seat ring. Replace the exhaust valve seat ring with a different material or unqualified quality. During use, the total wear of the exhaust valve seat ring and the exhaust valve head is greater than the camshaft. The total amount of wear on the tappet tappet, small exhaust valve head, and rocker arm tip, and the large exhaust valve head sink amount is too large, so that the longer the diesel engine is used, the smaller the exhaust valve clearance becomes.

4. The reason why the exhaust valve clearance has not changed

It is also a common phenomenon that the exhaust valve clearance of the diesel engine has not changed for a long time. Because the wear of each part that affects the change of the exhaust valve clearance is very small, or the exhaust valve head after the wear increases the exhaust valve clearance, the exhaust valve seat and the exhaust valve clearance become worn Large exhaust valve head, camshaft, tappet, tappet

The wear of the rod and the end of the rocker arm is almost equal, and the exhaust valve clearance will not change.

5. The reason why the exhaust valve clearance is large and small

The exhaust valve clearance changes abruptly, mainly because one or both of the camshaft and the tappet are bent. The camshaft and the tappet are constantly rotating during the operation of the diesel engine. This position is not in the original position every time, causing the exhaust valve clearance to change suddenly.

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