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| | | | Joined: Mar 2011 Posts: 25 New Guy | | New Guy Joined: Mar 2011 Posts: 25 | 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
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | 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. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Mar 2011 Posts: 25 New Guy | | New Guy Joined: Mar 2011 Posts: 25 | i just replaced the valve cover with new gasket and siliconed it
1966 GMC
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | 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. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Mar 2011 Posts: 25 New Guy | | New Guy Joined: Mar 2011 Posts: 25 | 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
| | | | | Joined: Dec 2008 Posts: 319 Shop Shark | | Shop Shark Joined: Dec 2008 Posts: 319 | 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 | | | | | Joined: Mar 2011 Posts: 25 New Guy | | New Guy Joined: Mar 2011 Posts: 25 | 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
| | | | | Joined: Sep 2010 Posts: 698 Shop Shark | | Shop Shark Joined: Sep 2010 Posts: 698 | 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: 19411953195919651966 1953 Willy's Pickup John Vegetarian- old Indian word for bad hunter
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