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2001 SAN - oil on plug threads |
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2001SAN 
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Joined: June-26-2012 Location: Ireland Status: Offline Points: 246 |
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 Topic: 2001 SAN - oil on plug threadsPosted: November-10-2013 at 11:43am |
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Hey all,
Removed spark plugs today to fog cylinders and found oil on one of the plug threads (first plug on port side). The top of the plug was also wet. Boat was running fine last outing, no smoke and no misfire. Engine was rebuilt with new short block last April (2012). Didn't have this issue last season when removing plugs. Any thoughts? D. |
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A little knowledge is a dangerous thing...
2001 Super Air Nautique 1989 Fairline Corniche 31 www.bannrivercruises.co.uk |
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MI-nick
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Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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Posted: November-10-2013 at 12:07pm |
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same story on my '99 SAN...no smoke, runs great, never worried about it...maybe I should...
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As far as I can tell, I'm not quite sure...
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2001SAN
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Joined: June-26-2012 Location: Ireland Status: Offline Points: 246 |
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Posted: November-10-2013 at 6:48pm |
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sounds good to me nick - i'll stop worrying!
just stood out a bit as all other plugs were bone dry but like you say, all is good otherwise so not too bothered (yet). are you having oil on the threads of the same plug as well?? someone somewhere said a bad valve cover gasket can cause this??? D. |
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A little knowledge is a dangerous thing...
2001 Super Air Nautique 1989 Fairline Corniche 31 www.bannrivercruises.co.uk |
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MI-nick
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Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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Posted: November-10-2013 at 7:40pm |
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the forward plugs on both banks have a little on the threads...now you're making me worry
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As far as I can tell, I'm not quite sure...
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: November-10-2013 at 7:59pm |
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I wonder if the plugs were torqued down correctly? If not, there will be some blow by. Over time you will get some oil/gas past the threads and the gas will evaporate. You are actually lucky. The reverse is rusted in frozen plugs!!
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2001SAN
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Joined: June-26-2012 Location: Ireland Status: Offline Points: 246 |
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Posted: November-10-2013 at 8:01pm |
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that could be it pete. i put them back in last year, possibly that one was not tight enough. how tight should the plugs be?
d. |
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A little knowledge is a dangerous thing...
2001 Super Air Nautique 1989 Fairline Corniche 31 www.bannrivercruises.co.uk |
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Frankenotter
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Joined: August-26-2012 Location: Milwaukee Status: Offline Points: 1072 |
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Posted: November-10-2013 at 9:44pm |
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I've had the same observation on my engine (351). I was fouling plugs before I rebuilt the carb this summer, so I don't know if the problem existed before that. However, now 6/8 plugs are perfect and two had oil on them. Engine runs fine.
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1999 Ski Nautique 196
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MI-nick
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Joined: January-12-2009 Location: Ypsilanti, MI Status: Offline Points: 810 |
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Posted: November-11-2013 at 2:37pm |
I'm thinking torque was OK as i've only seen this on the FR plug on each bank...both times i've fogged this particular boat. i'm thinking angle of the engine has something to with it?? |
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As far as I can tell, I'm not quite sure...
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8122pbrainard wrote: