Re: When does a head need rebuilding on an F-20 ?

Posted by Bill Smith on March 03, 2004 at 12:02:48 from (63.147.130.92):

In Reply to: When does a head need rebuilding on an F-20 ? posted by Pete L on March 03, 2004 at 10:30:51:

Burnt valves ussually will make a popping noise when engine is running. The sound will either travel out the exhaust or back through the intake. Bad seats or valves can incorporate a mis. F-20's are natorious for sticking valves also. You want to be darn sure that you don't have a valve or valves that are sticking open all the time or even once in a while. Remember that the stuff under the valve cover needs to be oiled every so many running hours. As Dave said, you might want to do a compression test. If you come up with low readings, squirt some oil in on top of the pistons and do it again. If you still have low readings, you have bad valves or seats. If the readings were low and oil brings the compression readings up to normal, you are losing compression at the piston rings (either bad rings or to much sleeve wear). If you pull the head to do a head job, be sure the valves, seats, guides, and everything is checked out in the head. Also check the head for flatness (most likely will be alright) and you will most likely want to use all new gaskets when you put it back together.

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