If the valve clearance is too large, the opening of the intake valve will be reduced and the opening time will be shortened, causing insufficient inflation, resulting in a decrease in the engine power. At the same time, the opening of the exhaust valve will be reduced, the opening time will be shortened, and the exhaust gas will be poor. As a result, the amount of exhaust gas remaining in the combustion chamber increases, and the economy of the engine deteriorates. In addition, abnormal impact sounds are generated between the transmission members and between the valve and the valve seat.
If the valve clearance is too small, the intake valve will not close tightly, the engine may leak in the hot state, resulting in a decrease in engine power, fuel consumption, and sometimes a carburetor tempering; at the same time, exhaust valves Lax close, resulting in reduced engine compression pressure, power, fuel consumption increases, sometimes exhaust pipe muffler and other phenomena.
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