Re: Can hole in exhaust manifold cause burnt valve and missing?

Posted by Bill B on June 14, 2001 at 04:38:51 from (209.182.69.38):

In Reply to: Can hole in exhaust manifold cause burnt valve and missing? posted by Will on June 14, 2001 at 03:34:38:

Burnt valves are caused by a variety of things. Usually the main cause is too little clearance in the valve lash. Other causes are worn valve guides, which allow the valve to wobble and not hit the seat squarly, carbon caught under the valve seat, rust on the seat or valve or both from standing a long time with the valve open, and wear on the valve face to the point that the edge of the valve gets very thin, and heats up. Most of the time, all of these things cause the valve to overheat becasue it did not have sufficient time to squarely seat on the valve seat, which is how it is cooled. When it overheats, it can get red hot, and the air coming and going cuts the valve like a cutting torch. I f it is the exhaust valve that is burnt, that could have caused the crack in the manifold, as more heat would be escaping the cylinder than normal.

Follow Ups:

• Re: Re: Can hole in exhaust manifold cause burnt valve and missing? Denny Frisk 05:43:00 06/14/01 (0)

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