intake/exhaust valve appearance? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 07-06-2001, 12:53 AM Thread Starter
 
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intake/exhaust valve appearance?

I just pulled of the intake/exhaust manifolds to weld up some holes in the header and was noticing the valve stem appearance. What should they look like on an engine that has about 100k? It doesn't burn excessive oil and runs fine, just curious about what they should look like. This is on a 258 I-6 by the way. The exhaust valve stems look yellowish tan, and the intakes look black and oily looking? The intakes look like they have some oily/grimmy buildup on them. How can I clean them off? Can I just spray a degreaser on them and then crank it out the engine? Or is there a better method to do this? Thanks in advance for any help!

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post #2 of (permalink) Old 07-06-2001, 06:50 AM
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Re: intake/exhaust valve appearance?

From the description it looks normal.

Intakes are subject to the recirculation of unburn gasses and fuel. That's the reason they look "oily."

Exhaust valves are subject to the hot exhausted gases which superheat any gasses in the manifold. The biggest problem here would be an exhaust valve that is leaking, causing unburnt fuel to be exhausted to the hot manifold and have it burn there. Then you've got a little problem on your hands.

As for trying to clean it up... short of hot tanking the intake and the exhaust manifolds and the head you'ld be causing yourself a whole lot of grief.

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