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When one or more of these valves is damaged, the result can be reduced power and low fuel consumption, or even complete engine failure.
The two most common types of valve failure are bent/broken valves and burned valves.
The valves in the cylinder head are a vital part of the engine and are under enormous pressure, opening and closing up to 2,500 times a minute under normal operating conditions.
When one or more of these valves is damaged, the result can be reduced power and low fuel consumption, or even complete engine failure.
The two most common types of valve failure are bent/broken valves and burned valves.
BENT VALVES
▶The most common failure of valves is bending or breaking due to contact with the piston. The valve touching the top of the piston is caused by broken timing chain/belt and improper engine synchronization due to improper installation of the new belt and chain.
▶The bent valve above is the result of a tired synchro belt breaking. Your sync tape will not last forever and will need to be replaced according to the manufacturer's service guidelines.
BURNT VALVES
▶Another common type of valve failure is valve burn or valve burn. Essentially, this is caused by combustion gas escaping when it is not properly sealed between the valve and the valve seat.
▶Hot combustion gas is forced through the valve and begins to burn off the edges of the valve, which can gradually worsen over time if not corrected.
▶Burning valves can cause performance and fuel consumption problems. Unsteady idle speed, reduced power, backfiring, and fire are all symptoms of valve burnout.
Possible causes of valve burnout are:
▶Local overheating.
▶The combustion gas escapes through the valve and is concentrated in one place.
▶Irregular valve seal in cylinder head seat.
▶Inadequate cooling is another factor, as the cylinder head cooling section is blocked.
▶Improper valve clearance can jeopardize valve seal and also cause such failure.
How to prevent such failures?
▶Maintain a clean, efficient cooling system so that the engine does not run too hot, use good quality fuel to help prevent carbon build-up in the valve seat, and have your mechanic regularly check that the valve clearance is up to specification.
▶Choosing a high quality engine valve can help you avoid these failures. Our 1D company, are a professional valve manufacturer, can provide you with a suitable valve for your engine, high quality and affordable price.
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