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  #1  
Old 05-14-2016, 12:41 PM
Guilhermepilot's Avatar
Guilhermepilot Guilhermepilot is offline
 
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Location: brazil
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Default Cabin smoke

Hello captains

Sometimes during taxi/ runup the LH lower corner of my firewall allows smoke through (white warm smells oil)
it takes a minute then is over
I think I will seal my Firewall I did not during construction, could be an oil over ehxaust?
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  #2  
Old 05-14-2016, 09:39 PM
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Steve Melton Steve Melton is offline
 
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I get that after I oil the exhaust flange ball joints with mouse milk.
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  #3  
Old 05-14-2016, 09:41 PM
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Vlad Vlad is offline
 
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Default

Quote:
Originally Posted by Steve Melton View Post
I get that after I oil the exhaust flange ball joints with mouse milk.
Why would you do this Steve? Any reason other then easier disassembling?
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  #4  
Old 05-14-2016, 09:57 PM
crabandy crabandy is offline
 
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Quote:
Originally Posted by Vlad View Post
Why would you do this Steve? Any reason other then easier disassembling?
Vlad,
As I understand it the ball joint on the exhaust needs to stay free (lubricated) so the exhaust can flex. If the ball joint freezes up then they will flex (break) somewhere else.
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  #5  
Old 05-14-2016, 10:11 PM
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Vlad Vlad is offline
 
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Quote:
Originally Posted by crabandy View Post
Vlad,
As I understand it the ball joint on the exhaust needs to stay free (lubricated) so the exhaust can flex. If the ball joint freezes up then they will flex (break) somewhere else.
Got it. I somehow thought the hanger hoses were the main flexers. Replaced all of them recently but never touched the ball joint.
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  #6  
Old 05-14-2016, 10:21 PM
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Steve Melton Steve Melton is offline
 
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apparently they don't need too much oil.
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RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all

Simplicity is the art in design.
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  #7  
Old 05-15-2016, 06:01 AM
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Guilhermepilot Guilhermepilot is offline
 
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Steve,

I will check my ehxaust, you gave a clue, that maybe a crack could lead smoke to firewall, anyway, I will seal it off

Thanks
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RV7A (Mr Flame) slow kit S/N 74285 Finished 04/14/15😀😀😀😀flying
G3X
Superior IO360
Sterba prop
TSFlightlines hoses
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  #8  
Old 05-15-2016, 06:43 AM
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Bill Boyd Bill Boyd is offline
 
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Default I'd seal it off.

It's not just a fire wall, it's a smoke wall and a CO wall of sorts, too.

I've gotten very accustomed to the odor of scorching oil in the cockpit after an oil change and the inevitable spillage of a few drops into places like the heat muff, where wiping up isn't easy.

This condition inspection I noted a few tiny gaps of daylight along the curved top of the firewall while "in the position" checking wiring, avionics, etc under the panel: gaps that had been left unsealed for nearly 20 years. I bought a fresh tube of red RTV and went to work on them. Ounce of prevention.

-Stormy
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  #9  
Old 05-15-2016, 11:47 AM
Gisnar Gisnar is offline
 
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Location: Northern Nevada
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I would get this sealed befor another flight!
Think Carbon Monoxide poisoning. This could really ruin your day.
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  #10  
Old 05-15-2016, 04:20 PM
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jjconstant jjconstant is offline
 
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Quote:
Originally Posted by Vlad View Post
Why would you do this Steve? Any reason other then easier disassembling?
Vetterman actually recommends putting mouse milk on the ball joints every time the cowl is off. I think when that joint can move freely it puts less stress on the exhaust hangers,
rubber cross-ties, and generally less stress on the whole exhaust system.
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