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#832626 - Mon Mar 05 2012 09:38 PM 250 smoking around the manifolds
bamaboy2223 Offline
New Guy
Registered: Fri Mar 04 2011 03:32 AM
Posts: 28
Loc: Alabama
My trucks smoking a little under the hood around the exhaust manifold, well i think anyway cuz on the 250 the intake and exhaust are on the same side, but its smoking a little under the hood and from the best i could tell thats where its coming from. Also it puts some smoke out the tail pipe. Where should i start here?
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1966 GMC
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#832658 - Mon Mar 05 2012 10:35 PM Re: 250 smoking around the manifolds [Re: bamaboy2223]
Wrenchbender Ret. Offline
Master Gabster
Registered: Sun Jun 20 2004 12:00 PM
Posts: 9412
Loc: Lenexa Ks.
Probably the valve cover gasket is leaking & the oil is running down to the manifolds.
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I'm not a fast mechanic but I'm not really a slow mechanic. Actually I'm just a half-fast mechanic.

1956 Chevy 1/2-Ton Pickup

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#833228 - Wed Mar 07 2012 08:38 PM Re: 250 smoking around the manifolds [Re: Wrenchbender Ret.]
bamaboy2223 Offline
New Guy
Registered: Fri Mar 04 2011 03:32 AM
Posts: 28
Loc: Alabama
i just replaced the valve cover with new gasket and siliconed it
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#833270 - Wed Mar 07 2012 10:30 PM Re: 250 smoking around the manifolds [Re: bamaboy2223]
Wrenchbender Ret. Offline
Master Gabster
Registered: Sun Jun 20 2004 12:00 PM
Posts: 9412
Loc: Lenexa Ks.
It may be blow by. Does smoke come out the breather cap when it is running?
_________________________
I'm not a fast mechanic but I'm not really a slow mechanic. Actually I'm just a half-fast mechanic.

1956 Chevy 1/2-Ton Pickup

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#833365 - Thu Mar 08 2012 09:17 AM Re: 250 smoking around the manifolds [Re: Wrenchbender Ret.]
bamaboy2223 Offline
New Guy
Registered: Fri Mar 04 2011 03:32 AM
Posts: 28
Loc: Alabama
No it doesn't have any blow by. When I replaced the valve cover with a chrome one i have to bend it to fit right and it bent the a lip out in the backside and it was leaking out well I removed it and straightened it out and put a new cork gasket on and ran the truck and it's still smoking
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1966 GMC
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#833423 - Thu Mar 08 2012 01:38 PM Re: 250 smoking around the manifolds [Re: bamaboy2223]
starfire4 Offline
Shop Shark
Registered: Wed Dec 17 2008 07:42 AM
Posts: 319
Loc: White Cloud, MI, USA
Is this sudden, like since you replaced the valve cover & gasket?

cm
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#833530 - Thu Mar 08 2012 08:16 PM Re: 250 smoking around the manifolds [Re: starfire4]
bamaboy2223 Offline
New Guy
Registered: Fri Mar 04 2011 03:32 AM
Posts: 28
Loc: Alabama
yeah it is. It smoked before and i knew it was cuz the bent lip on the valve cover so i fixed that and its still smoking now
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1966 GMC
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#833655 - Fri Mar 09 2012 08:21 AM Re: 250 smoking around the manifolds [Re: bamaboy2223]
johntsmith Offline
Shop Shark
Registered: Fri Sep 24 2010 03:39 PM
Posts: 783
Loc: Tampa Bay FL
Originally Posted By bamaboy2223
Also it puts some smoke out the tail pipe. Where should i start here?


Sounds like you have an exhaust leak at the manafold. If so it should be making some hissing noise. Also sounds like you either have a valve seal problem or rings. You claim no blow-by but are you sure? Take the breather out of the valve cover and give it a few revs. If you get a lot of smoke coming out the valve cover it's time to replace the seals. Did you do a compression test on the engine?
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