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Old 12-18-2020, 10:58 PM   #1
tzeigle
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Default Oil fouled plug good compression

2006 EZ-Go TXT had a oil fouled plug on one cylinder. Compression on both cylinders was either 140 or 150 (can't remember). Did a cylinder leakage test and that checked out as well. The engine runs well. Could hear some air coming through the valve train even though the cylinder leakage test appeared to be good. My first thought goes to valve seals. Any help would be greatly appreciated.
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Old 12-19-2020, 06:09 PM   #2
Golf cart guy
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Default Re: Oil fouled plug good compression

Plug that fouled was the one closest to the driver. Good chance the valve stem seal is at fault. If the motor has a lot of hours on it, it can be piston rings starting to fail.
If that motor starts to leak oil (common) or gets to the point it needs rebuilt, be warned the aftermarket engine parts are junk. Seals and gaskets are junk too.
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Old 12-19-2020, 06:58 PM   #3
tzeigle
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Default Re: Oil fouled plug good compression

Thank you for your reply. Can valve seals be replaced on this engine without removing the head?
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Old 12-28-2020, 12:32 AM   #4
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Default Re: Oil fouled plug good compression

Yes they can. Is it smoking at all? Thats also a tell tale of worn out valve seals. Oil smell is another. Im sure the exact steps are outlined somewhere on here but it's a pretty easy job that just entails removing the valve cover, removing the spark plugs, putting some rope into the cylinder to push the valves up (and keep them from falling into the cylinder), then removing keepers and changing the seals. No more than a 30 min job for me and I didnt know what I was doing the first time. Had similiar symptoms as yours. Burning a little oil, fouled plugs, puff of smoke on start, and good compression. Was cheap, fast, and fixed the problem. The teflon on the original seals was completely gone.
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Old 12-28-2020, 08:46 AM   #5
Down South
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Default Re: Oil fouled plug good compression

The rope sounds like a neat trick. I've also heard that you can use air pressure to hold the valves up while replacing the seals.
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Old 12-28-2020, 08:47 AM   #6
trig123
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Default Re: Oil fouled plug good compression

Quote:
Originally Posted by newtjl View Post
Yes they can. Is it smoking at all? That's also a tell tale of worn out valve seals. Oil smell is another. I'm sure the exact steps are outlined somewhere on here but it's a pretty easy job that just entails removing the valve cover, removing the spark plugs, putting some rope into the cylinder to push the valves up (and keep them from falling into the cylinder), then removing keepers and changing the seals. No more than a 30 min job for me and I didn't know what I was doing the first time. Had similar symptoms as yours. Burning a little oil, fouled plugs, puff of smoke on start, and good compression. Was cheap, fast, and fixed the problem. The Teflon on the original seals was completely gone.
Even though the original poster has not logged in a week to check I would add you can put air pressure in cylinder to hold those valves up while you pop the seals in.

I have a hose with end that screws right in spark plug hole and quick coupler on other end to connect the air hose to.

Set the air pressure lower when doing this making sure both valves are closed. My problem is those tine valve keepers and my old eyes. Don't lose those tiny keepers

30 minutes job to do this. Four hours to find the keepers that flew by your head
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