Quote:
Originally Posted by kathyricks
Why did your exhaust valves burn in the first place? Some abnormality had to have caused the exhaust valves to get abnormally hot and in turn cause the valve wear or valve seat wear that in turn caused the exhaust valve clearances to tighten up. What abnormality was it? Engine pinging? Cooling system problems? Delayed spark plug changes? Driving with an ignition miss? Engine mods? Exhaust system mods?
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Nope- no mods. Completely stock high mileage (200K) engine. I am assuming that the valves had never been adjusted, probably had a lack of maintenance all the way around.
Quote:
Originally Posted by mustang67408
Cheap AMERICAN STEEL used to make the valves. It's the same reason most of the 3.0L V-6 exhaust valves tuliped too.
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I trust that Victor knows what he is talking about with regards to the mechanics of Toyota engines. Everything he has told me so far has been spot on.