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Cockpit smoke

 
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MnwPeeps(at)AOL.COM
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PostPosted: Wed Jan 09, 2008 8:01 am    Post subject: Cockpit smoke Reply with quote

Periodic completed in early Dec. on my -6A, by an experienced GA mech/pilot.

Flew the a/c 30 minutes to home base in MA.

Two weeks later, within 10 seconds of first (next) start-up, oily smoke fills cockpit - had to quickly open tilt.
Continued for about 45 sec. to a minute, then the smoke ceased and hi-pwr turn-up was fine. Shut down.

Waited about ten days ('til yesterday), fired it up again, same result. No ramp drip. My mech is mystified.
I, personally, have not had this occur in 50 years of flying a/c of all type.

Mech is now in FL for two months. Anybody had similar, with an idea for the owner?

              Thanks - George

Start the year off right. Easy ways to stay in shape in the new year.
[quote][b]


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ronlee(at)pcisys.net
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PostPosted: Wed Jan 09, 2008 9:19 am    Post subject: Cockpit smoke Reply with quote

First thing I would do is remove the cowling and investigate. If you
have not done this then DO NOT fly until you identify and resolve
the problem.

Ron Lee
[quote] ---


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MnwPeeps(at)AOL.COM
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PostPosted: Wed Jan 09, 2008 9:59 am    Post subject: Cockpit smoke Reply with quote

In a message dated 1/9/2008 12:20:18 PM Eastern Standard Time, ronlee(at)pcisys.net writes:
Quote:
First thing I would do is remove the cowling and investigate. If you
have not done this then DO NOT fly until you identify and resolve
the problem.


Yeah, thanks, Ron. My thoughts, too - - but it is rather cold up here, with no hgr space. I'm sort of a candy-ass, as fingers begin to freeze.

I was hesitant to go through the drill, and then, being inexperienced in mechanical work, to not see anything identifiable. I'm thinking I'd like something to suggest to my mech (surprised he has no ideas....he's a good mech, best as I know). But I suppose I'll just have to get some locals experts to look at it.

It's odd that it flew well from the NH "button-up" to here at my MA base....but then began smoking. I guess one might have to suppose it very possibly is not related to the so-called annual.

Start the year off right. Easy ways to stay in shape in the new year.
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kbob(at)cox.net
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PostPosted: Wed Jan 09, 2008 11:20 am    Post subject: Cockpit smoke Reply with quote

Check the crankcase breather tube over the exhaust system. It may be soaking the exhaust pipe with oil and burning off on start up. At idle power on the ground you can get plenty of exhaust in the cabin.

Have somebody stand by when you start it again and see if they can detect any external smoke. If it repeats itself, shut down and go look for the smoke trail to find the culprit.

Kelly Patterson
RV-6A N716K
PHX, AZ

---- Ron Lee <ronlee(at)pcisys.net> wrote:
[quote] First thing I would do is remove the cowling and investigate. If you
have not done this then DO NOT fly until you identify and resolve
the problem.

Ron Lee
---


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Ed Anderson



Joined: 10 Jan 2006
Posts: 475

PostPosted: Wed Jan 09, 2008 11:24 am    Post subject: Cockpit smoke Reply with quote

I'm not a mechanics , however, it sounds to me like you have an oil leak which slowly accumulates a bunch over several days, then when you fire it up, the oil creates the smoke until it is depleted. Could be a leak internal to the engine example intake or exhaust valve (I would bet on intake) leaking into the induction tubes and then being sucked into the pistons and burned.

Ed

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Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
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ronlee(at)pcisys.net
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PostPosted: Wed Jan 09, 2008 11:57 am    Post subject: Cockpit smoke Reply with quote

It may have taken that amount of time for something to develop. Find a hangar, remove the cowl
and look for loose hoses, particularly oil carrying hoses. It may be something else but without
looking, don't expect answers.

Ron Lee
[quote] It's odd that it flew well from the NH "button-up" to here at my MA base....but then began smoking. I guess one might have to suppose it very possibly is not related to the so-called annual.




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MnwPeeps(at)aol.com
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PostPosted: Wed Jan 09, 2008 11:59 am    Post subject: Cockpit smoke Reply with quote

In a message dated 1/9/2008 2:25:42 PM Eastern Standard Time, eanderson(at)carolina.rr.com writes:
Quote:
it sounds to me like you have an oil leak which slowly accumulates a bunch over several days, then when you fire it up, the oil creates the smoke until it is depleted. Could be a leak internal to the engine example intake or exhaust valve (I would bet on intake) leaking into the induction tubes and then being sucked into the pistons and burned.



Thanks, Ed. I certainly agree with the slow-accumulation theory. I'll go out with another guy, fire it up, see what we see from an external view. Shouldn't be a biggie.

Start the year off right. Easy ways to stay in shape in the new year.


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Jerry Cochran



Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR

PostPosted: Thu Jan 10, 2008 11:11 am    Post subject: Cockpit smoke Reply with quote

Ron Lee said it best, and let me second it...

DO NOT FLY THIS AIRCRAFT. Until you get it sorted by yourself or
someone who knows what they are doing.

My .02 of course...

Jerry
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