Hi guys, I posted a few days ago regarding some nice black rubbish coming out the exhaust lol today I started the mini up and there was a bit of blue smoke on startup and then for about 30 seconds afterwards. Im guessing blue means burning oil - white being headgasket.
Anyhow, my mini overheated about a week ago (It seems ok with no loss of power or damage) could this perhaps be ultra thin oil seaping into the exhaust when it was really hot and this is now burning off?
Blue Smoke
Started by
m1tch
, Jul 30 2009 01:53 PM
9 replies to this topic
#2
998dave
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Posted 30 July 2009 - 02:34 PM
blue smoke is oil in the exhaust.
If it continues to do it I'd get a bit worried, could be, (among other things);
- headgasket, (oil way to cylinder),
- valve stem seals, (may have hardened broken down due to overheating),
- blocked breather, or high blow-by,
Dave
If it continues to do it I'd get a bit worried, could be, (among other things);
- headgasket, (oil way to cylinder),
- valve stem seals, (may have hardened broken down due to overheating),
- blocked breather, or high blow-by,
Dave
#3
m1tch
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Posted 30 July 2009 - 04:55 PM
I will keep an eye on it, its the first time that its happened, yesterday it got rid of all the rubbish out the exhaust and today it obviously burnt off some oil lol if it does it tomorrow I will worry, although its not whilst im driving, just on startup/30seconds of pulling away so not all the time
#4
rick.spi
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Posted 30 July 2009 - 09:18 PM
i recon when it only smokes on statup its the stem seals, found this out on my golf when it burnt oil on startup, new stem seals fixed it. usually when piston rings go its a constant smoking 
. only in my experience anyway. thats what ive been told.
. only in my experience anyway. thats what ive been told.
#5
m1tch
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One Carb Or Two?
Posted 30 July 2009 - 10:09 PM
Im guessing thats a head rebuild then? lol ON WITH THE 1275 WITH WEBERS lol 
#6
dannyg2325
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Posted 30 July 2009 - 11:36 PM
when i striped my 1275 for re-build to 1380, i was getting blue smoke on start up, turned to be the valve guides worn.
#7
998dave
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Posted 31 July 2009 - 07:10 AM
Based on your description I'm with Rick, valve stem seals.
It is a head rebuild, yes, essentially head off, rockers off, valve springs off, replace seals, and rebuild.
But then while it's apart you may as well give the combustion chambers a decoke, and relap the valves.
Dave
It is a head rebuild, yes, essentially head off, rockers off, valve springs off, replace seals, and rebuild.
But then while it's apart you may as well give the combustion chambers a decoke, and relap the valves.
Dave
#8
m1tch
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One Carb Or Two?
Posted 31 July 2009 - 11:31 AM
I will keep an eye on it as its not smoking today when I took it out
#9
GuamMini
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Posted 17 November 2017 - 05:06 AM
Do they have valve seals? rubber ones?
#10
Spider
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Posted 17 November 2017 - 07:42 AM
This is an old post.
There are Stem Seals for the Valves.
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