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  #1  
Old Sep 8th, 06, 02:11 PM
jks67SS396 jks67SS396 is offline
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Jeff
 
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Default worn valve guides...erratic vacuum?

Can someone explain how worn valve guides would create an rapidly fluctuating vacuum signal on a vacuum gauge?

thanks
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Old Sep 8th, 06, 07:15 PM
zdld17 zdld17 is online now
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Don
 
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Default Re: worn valve guides...erratic vacuum?

Worn guides will not let the valve head seat directly on the valve seat, thus causing a mismatch on the faces. Thus not sealing properly. Remember that the motor is basically an air pump.
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Old Sep 8th, 06, 07:45 PM
jks67SS396 jks67SS396 is offline
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Jeff
 
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Default Re: worn valve guides...erratic vacuum?

Thanks DoubleD!
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Old Sep 8th, 06, 08:16 PM
sleeper69 sleeper69 is offline
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Default Re: worn valve guides...erratic vacuum?

Have you checked the compression on each cylinder?

Every time that I have observed a rapidly fluctuating gauge I have had a burned valve or bad seat. May not be the case here but worth a compression check. A broken valve spring will do the same thing.
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Old Sep 8th, 06, 11:25 PM
jks67SS396 jks67SS396 is offline
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Jeff
 
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Default Re: worn valve guides...erratic vacuum?

ive had th same symptoms for a year and i did do a compression check last year. all where 190-200 psi.

did a leak down test too...and that came back fine too. a vacuum leak or bad guides might still pass both tests, right?

is there a way to test the valve springs without taking everything apart?

thanks
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