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  #1  
Old 10-24-2013, 05:04 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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Default blue/fuel stain on carb - normal?

During my last oil change I noticed a bit of blue staining around the nut on the bottom of the carb (I'm not sure what it's called). I think it's probably been gradual enough that I just haven't noticed it before, and it doesn't seem to be much of a weep or leak, but what might cause it and what should I do, if anything, to address it?
Thanks.



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  #2  
Old 10-24-2013, 07:44 PM
crabandy crabandy is offline
 
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I'm not a carb expert, but on my Marvel Schebler MA4-5 I have a similar looking copper crush/lock washer that is probably seeping.
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  #3  
Old 10-24-2013, 07:59 PM
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Couple hundred hours ago I noticed this





Cleaned thoroughly and watched closely. Nothing since then.
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  #4  
Old 10-25-2013, 07:30 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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Thanks guys. I'll keep my eye on it and keep looking for answers.
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  #5  
Old 10-26-2013, 03:52 AM
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Clean it up, snug it down and keep an eye on it. report back next month.
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  #6  
Old 10-26-2013, 03:14 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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Quote:
Originally Posted by turbo View Post
Clean it up, snug it down and keep an eye on it. report back next month.
Thanks Ed. What do I snug down? The outer brass part or the inner silver hex-head screw? Do I need to keep one in the same position while tightening the other down?
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  #7  
Old 10-27-2013, 09:45 AM
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clean it off first so you can keep track of the leak. put a wrench on the brass nut and see if it is a bit loose. check with your mechanic if this doent help.
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  #8  
Old 10-27-2013, 11:57 AM
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Quote:
Originally Posted by turbo View Post
clean it off first so you can keep track of the leak. put a wrench on the brass nut and see if it is a bit loose. check with your mechanic if this doent help.
....
It is probably not a good idea to try and tighten any nuts that are safetied with a bent tab safety washer...

The correct fix would be to remove, replace the tabbed washer, retorque and rebend the tab.
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  #9  
Old 10-27-2013, 06:25 PM
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This is just a guess... but could the blue stains be a side effect of combining dissimilar metals and aviation fuel?
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  #10  
Old 10-27-2013, 06:55 PM
aerhed aerhed is offline
 
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No, its just blue dye getting thicker as fuel vaps off leaving the dye. Common. Also common are small seeps like this with copper gaskets. Turbo hit it already. Crunch that brass into that copper a microturn and snug the tab flush again. Spritz it clean with a little electronic cleaner and check later. Done.
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