04-18-2014, 11:47 AM | #1 |
Registered User
Join Date: Aug 2011
Location: Denton, Tx
Posts: 69
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piston question
I have a 350 that has a spark plug that keeps gumming up. Am I right in thinking its the piston ring? If so, do I re-ring just the one or all eight? If its not the piston ring what is it?
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04-18-2014, 12:39 PM | #2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,732
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Re: piston question
It's likely a valve seal.
Clean the plug real good or use a new one, run it awhile (go for a cruise), pull the plug and look for oil on the plug threads. The only place that oil will come from is a valve seal that's caput. |
04-18-2014, 12:48 PM | #3 |
Registered User
Join Date: Aug 2011
Location: Denton, Tx
Posts: 69
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Re: piston question
I didnt even think about the valve's. Ill try you test out. Thanks...
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04-18-2014, 07:31 PM | #4 |
Just here to tinker
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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Re: piston question
First thing you should do is a compression test. This will tell you the condition of your rings and/or valves. If you test it and have low compression numbers, add a teaspoon of oil to the cylinder with low compression and test again. If the compression rises after that, you have worn rings.
One thing you can do (as a band aid) if you do not want to repair anything right now is run a hotter plug. That will help burn the oil off of the insulator and keep it from gumming up.
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