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#832626 - Tue Mar 06 2012 03:38 AM 250 smoking around the manifolds  
bamaboy2223  Offline
New Guy
Joined: Mar 2011
Posts: 28
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?


1966 GMC


#832658 - Tue Mar 06 2012 04:35 AM Re: 250 smoking around the manifolds [Re: bamaboy2223]  
Wrenchbender Ret.  Offline
Master Gabster
Joined: Jun 2004
Posts: 9,677
Lenexa Ks.
Probably the valve cover gasket is leaking & the oil is running down to the manifolds.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup


#833228 - Thu Mar 08 2012 02:38 AM Re: 250 smoking around the manifolds [Re: Wrenchbender Ret.]  
bamaboy2223  Offline
New Guy
Joined: Mar 2011
Posts: 28
Alabama
i just replaced the valve cover with new gasket and siliconed it


1966 GMC

#833270 - Thu Mar 08 2012 04:30 AM Re: 250 smoking around the manifolds [Re: bamaboy2223]  
Wrenchbender Ret.  Offline
Master Gabster
Joined: Jun 2004
Posts: 9,677
Lenexa Ks.
It may be blow by. Does smoke come out the breather cap when it is running?


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup


#833365 - Thu Mar 08 2012 03:17 PM Re: 250 smoking around the manifolds [Re: Wrenchbender Ret.]  
bamaboy2223  Offline
New Guy
Joined: Mar 2011
Posts: 28
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


1966 GMC

#833423 - Thu Mar 08 2012 07:38 PM Re: 250 smoking around the manifolds [Re: bamaboy2223]  
starfire4  Offline
Shop Shark
Joined: Dec 2008
Posts: 319
White Cloud, MI, USA
Is this sudden, like since you replaced the valve cover & gasket?

cm


If you can't fix it with a hammer and screwdriver, you need a bigger hammer.
1965 Chevy C10

#833530 - Fri Mar 09 2012 02:16 AM Re: 250 smoking around the manifolds [Re: starfire4]  
bamaboy2223  Offline
New Guy
Joined: Mar 2011
Posts: 28
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


1966 GMC

#833655 - Fri Mar 09 2012 02:21 PM Re: 250 smoking around the manifolds [Re: bamaboy2223]  
johntsmith  Offline
Shop Shark
Joined: Sep 2010
Posts: 783
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?


My Fleet:
1941
1953
1959
1965
1966
1953 Willy's Pickup

John

Vegetarian- old Indian word for bad hunter


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