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Topic: Oily spark plug (Read 471 times) |
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Oily spark plug
« on: May 13th, 2007, 12:58pm » |
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What does it mean if I find engine oil on the sealing ring of the front spark plug?
(The engine uses ~1 liter oil per 250-300+ miles)
The other spark plugs were dry.
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: Oily spark plug
« Reply #1 on: May 13th, 2007, 1:22pm » |
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hi there
sound like the spark plug gasket is gone. i've changed mine (still get a little in no.1 plug hole), easy enough to do.
just follow the intructions on the site.
hth
ps, change the rocker cover gasket at the smae time. 
pages 6 & 17.
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Matt
Senior Member
Manual'd and a 4.0 in the making
Posts: 2816
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Re: Oily spark plug
« Reply #2 on: May 13th, 2007, 2:56pm » |
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could it just be the rocker cover gasket is leaking a little
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FDS2000 Scans - Birmingham
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: Oily spark plug
« Reply #3 on: May 13th, 2007, 3:20pm » |
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I would be relieved if it's only that gasket. Doesn't seem too hard to change, and they seem to be cheap as well.
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Spannerdemon
Guest
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Could also be because whoever last changed this plug didn't tighten it fully, and a little oil has been slightly blowing past the seal.
It's not a good idea to overtighten spark plugs, but having said that, they do need to be fully tightened, enough to compress the sealing ring. If the sealing ring doesn't get crushed down, it won't seal fully. 
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Oily spark plug
« Reply #5 on: May 14th, 2007, 12:20am » |
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Have a good look down the plug holes........If the plug seating has any carbon, oil, etc sitting around the edge, then give it a clean with a rag & if the deposits are hard, give it a scrape with a long screwdriver until it looks nice & shiney again.
Then clean up the sealing rings on the plugs with a bit of fine grade wet & dry, so they are nice & smooth.
This should make them seal properly & stop any leaks
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: Oily spark plug
« Reply #6 on: May 14th, 2007, 10:28am » |
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Thanks JC
I actually did exactly that yesterday
The seats looked clean, but there were a microscopic black rim on the sealing rings. Polished them clean with some fine grade paper. The car did run slightly smoother and quieter afterwards, but that may be down to me attacking the tip of the plugs with the paper as well.
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: Oily spark plug
« Reply #7 on: May 15th, 2007, 10:49am » |
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Ordered a new gasket today. £12 from my FMD. They said they should have it by monday. FPUK wanted £7.58, but in addition came £23.24 in shipping.
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