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Re: Re: Re: Re: SETTING THE VALVES
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Posted by jdemaris on May 13, 2004 at 05:05:44 from (209.23.29.64):
In Reply to: Re: Re: Re: SETTING THE VALVES posted by rustyfarmall on May 12, 2004 at 21:37:59:
I don't know about the condition of the guy's springs but it doesn't matter. If a proper valve job was done it would take very little pressure for the valve to seal. Weak springs would have an effect at higher RPMs, but not at cranking. They'd have to be broken to cause the valve to hiss through a port at cranking speed. If the seats were ground deeper, and the valves refaced and therefore thinner, the springs should have been to shimmed to get back to proper installed spring-height - but still - that's not going to make them leak at cranking speed. If they are leaking, sounds like someone did a botch-job. That's one of the reasons I like using valve-lapping compound. I don't use it seal the valve and seat, I use it as a marking compound. It shows if good contact is being made or not, how wide the seat is, how much valve margin exists, etc. Also - one suggestion. Anytime we'd get a head back from a shop (instead of doing it ourselves) we fill the ports with kerosene and stand the head on its side - and then wait and see it the kerosene would leak through the valves. It's a good quick test to see if someone did a bad screw-up.
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