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07-04-2007, 09:58 PM
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#1 |
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Registered User
Join Date: Feb 2007
Location: Colorado
Posts: 255
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Burning oil
My truck is burning oil in the number three cylinder. There is a large cloud of bluish smoke when I start the truck and also if I accelerate hard. My question is this, how can I tell if the oil is getting into the cylinder past a piston ring or dripping past a valve seal. It seems to me that if it was a ring then it wouldn't make a big cloud when it starts because oil doesn't flow up but it could drip down past a leaking valve seal. I'm hoping it's just a valve seal that I can fix when I do my carb and intake manifold swap.
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“If you don’t have time to do it right now, how will you ever find time to fix it.” - author unknown '70 SWB Step-Side (More rust than metal) 
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07-04-2007, 10:02 PM
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#2 |
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Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,814
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Re: Burning oil
GENERALLY smoke at startup is an indication of oil coming in at the valve as you note. The valve seal is a band-aid for worn guides but may help somewhat.
How can you be sure that it's only #3? |
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07-04-2007, 10:06 PM
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#3 |
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Registered User
Join Date: Feb 2007
Location: Colorado
Posts: 255
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Re: Burning oil
I guess I shouldn't say only #3 but I pulled all the plugs and #3 is black and sooty but the rest of them are at least cleaner than it is so #3 is the big problem right now.
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“If you don’t have time to do it right now, how will you ever find time to fix it.” - author unknown '70 SWB Step-Side (More rust than metal)
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07-04-2007, 10:15 PM
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#4 |
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Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,814
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Re: Burning oil
I think you're right and that's a pretty good indication.
IMHO...I'd leave it. It's a fair bit of work to change all the valve seals as I'm sure you know, and unless you're killing mosquitos in 3 counties it's not likely to help a whole bunch 
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07-04-2007, 10:33 PM
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#5 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Burning oil
Best way to tell if it is the seals is to run up tp speed and let off. If it emits a cloud of smoke when you step down on it again the guides are worn or seals are bad or both. Sounds like you have oil ring problems also if it smokes wnen you are pulling hard.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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07-05-2007, 12:05 AM
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#6 |
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It's the air up here
Join Date: Mar 2007
Location: Western Colorado
Posts: 710
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Re: Burning oil
If it smokes on acceleration its the rings, on decel its the valve guides as a general rule.
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1971 cheyenne k10 4 speed np 205 454 BB factory a/c  Never drink down stream of the herd! Eric |
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07-05-2007, 12:29 AM
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#7 |
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Friday's Toy
 
Join Date: Nov 2006
Location: Ovilla, TX
Posts: 574
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Re: Burning oil
Mine does that. Number 4 and 6 on the 454 are getting carboned up from the oil burning on it. Mine normally does it during higher rpms to get that gummed up. Mine does it after I drive it and come back out like from the store and start it up. When I get on it I get a cloud of smoke from that side. I haven't yet seen if it does it when I let off....Mikey
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07-05-2007, 08:09 AM
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#8 |
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Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,261
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Re: Burning oil
I would do a quick compression test on the cylinder. If rings are worn, the compression will be significantly lower in that cylinder. You can buy a "no fowl" spark plug extension to buy you some time. It is just ahollow thingy that you screw into the head and then screw the plug into it. It helps minimize the plug from fouling but like all the other suggestions---it is just a bandaid. Good luck
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