Оролтын хавхлагыг орж ирж буй агаар хөргөнө. Яндангийн хавхлагыг тэр агаар халаана. Энэ ганц ялгаа нь материалыг, бүрэлтийг болон эвдрэлийн хэлбэрийг тайлбарладаг.
Intake valves work cooler but face abrasive dust through a bad filter and repeated impact on the seat. Martensitic heat-resistant steel with added alloying elements is the usual answer.
A burned intake valve almost always means a leaking air filter or a valve clearance that closed up.
Exhaust valves run at the highest metal temperature in the engine and are attacked by combustion products. Austenitic heat-resistant steel with high-temperature alloying elements and nano-scale compounds is used, plus chrome plating on the stem.
Typical failure is a burnt margin at one sector — usually where the injector sprays unevenly or the clearance was too tight.
Every combustion cycle slams the valve into its seat. Over time the seat and the valve face wear, the valve sinks deeper, and the clearance closes until the valve no longer seals.
This is normal wear, but it is accelerated by bad fuel, dust, and by never checking clearances. Check them at the interval, cold, and record the numbers — a valve that moves 0.2 mm between checks is telling you something.
Send your model, engine code or OEM number. We confirm fitment in writing before you pay; the first order on the Mongolia line ships free up to 30 kg — one time only.
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