Nathan
Club Retro Rides Member
Posts: 5,649
Club RR Member Number: 1
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Smokey BreatherNathan
@bgtmidget7476
Club Retro Rides Member 1
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Hi Peoples
Pretty sure this is nothing to worry about but I thought I would throw it up here anyway.
The MG has just returned to the road after being put in my garage since October (don't use it in winter), Been for it MOT which it flew right through (Good cus I only did 1000 mile last year).
However Last night I was wiring up the new electric fan and noticed when the engine was running that gas/smoke was coming from the catch tank breather. Now I know originally the breathers connect to the inlet re-circulating hot air etc so this would not be noticed in normal uses, but I have never noticed it before.
Its not a massive amount but does increase slightly when the car is rev'ed up.
Nothing to worry about or something is about to go?
The engine has only done 6k since its full rebuild but hey who knows, if its got something wrong then best to change it out now before the RR show.
p.s.
I have done a full service as I thought it could be fuel vapour coming off the oil.
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If it's anything like a Ford crossflow then that's pretty normal...
**edit** Sorry, that sounded a little blasé - what I meant was, my mkII Cortina used to do exactly the same thing so I took it to Morley's in Redhill (who know their Fords) and they said it's just what they do. When I replaced the engine with another crossflow, that did exactly the same. Whether or not you can draw comparisons with the crossflow and the MBG engine, I have no idea!
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Last Edit: Jun 3, 2009 14:43:26 GMT by dbizzle
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Smoke/oil/gases from the breather is a sign of piston ring blow-by. As dbizzle says, how much blow-by is considered normal would depend on the engine. I recently bought a used Beetle engine which doesn't smoke and barely blows out of the breather at all, even when you rev it with the oil cap off. That is usually taken as a pretty good sign that all the piston rings are doing their job well. Has the MG always been like this or is it a fairly recent thing? Best to ask an MG expert.
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V-Force
Part of things
I like Hondas.
Posts: 846
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My Mini does this, even when just turning the engine over with the fuel pump off even if the engine has not run for a few minutes This is out of the rocker cover breather though
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Last Edit: Jun 3, 2009 15:27:53 GMT by V-Force
1999 Impreza WRX typeR STI Version 5 Limited 1999 Civic VTi-S Aerodeck 2005 Bora TDI daily
Several other 90s Hondas (shhh they're sleeping)
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Smokey BreatherDeleted
@Deleted
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Yep, it's probably worn rings on your engine.
Ford crossflows usually do it because the headgasket blows through from a bore to the oilway, which is quite close. Sometimes it's the rings but usually it's the headgasket on the Kent.
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ChasR
RR Helper
motivation
Posts: 10,256
Club RR Member Number: 170
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Smokey BreatherChasR
@chasr
Club Retro Rides Member 170
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Before the rings are dismissed, I would do a compression test or preferably a leakdown test on the engine to see what kind of health it is in.
BTW, what was your no spark issue down to in the end? I'm trying to get my dizzy out of the brown 'B's block. The damn thing seems to be stuck in it!
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A little bit is normal.
Take the 710 cap off and let the engine idle - you will probably get a bit of puffing. Revving the engine should not make it increase much - on a good engine it can reduce it.
If the engine's not burning or leaking oil, and the compression is healthy, then I'd leave it alone.
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Nathan
Club Retro Rides Member
Posts: 5,649
Club RR Member Number: 1
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Smokey BreatherNathan
@bgtmidget7476
Club Retro Rides Member 1
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Buggers was hoping its not the rings.
When taking the pipe off and letting it idle, she puffs slightly it does increase slightly though.
Will check the oil usage and compression later though.
ChasR
It turned out to be a faulty Magnatronic, apparently there is a dodgy batch going round, gone back to points until my new one is here.
My Dizzy too a little bit of pulling mate.
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Last Edit: Jun 3, 2009 16:07:27 GMT by Nathan
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Nathan
Club Retro Rides Member
Posts: 5,649
Club RR Member Number: 1
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Smokey BreatherNathan
@bgtmidget7476
Club Retro Rides Member 1
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Ahh forgot to mention this is the Crank case breather.
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Nathan
Club Retro Rides Member
Posts: 5,649
Club RR Member Number: 1
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Smokey BreatherNathan
@bgtmidget7476
Club Retro Rides Member 1
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Waveman, TBH I am unsure its only becuase I have been under the bonnet more than normal fitting the new fan and points that I noticed the issue.
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bstardchild
Club Retro Rides Member
Posts: 14,937
Club RR Member Number: 71
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Smokey Breatherbstardchild
@bstardchild
Club Retro Rides Member 71
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I've tried patches and chewing gum.......... neither worked
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GavinJ
Club Retro Rides Member
MGB 3.9 v8 Sebring
Posts: 927
Club RR Member Number: 209
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Smokey BreatherGavinJ
@gavinj
Club Retro Rides Member 209
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The V8 in my MGB, chucks a fair bit of smoke out the breathers - holds very good oil pressure but local garage said its probably down to slightly worn rings but did say it will probably carry on doing it for many years to come with no issues...
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If-as you state- ifs not been used since October, and only done 6k,its probably gummy rings-that will free up with use. Give it 500 miles- then check again
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Nathan
Club Retro Rides Member
Posts: 5,649
Club RR Member Number: 1
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Smokey BreatherNathan
@bgtmidget7476
Club Retro Rides Member 1
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Cheers for your comments guys.
Worked it out the car has actually only done 10k since it rebuild.
Think I will just leave it till it starts using oil and chucking alot of smoke out.
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