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FAB and carb wear, '98 FP O-320 RV-6A

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sportav8r(at)aol.com
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Posted: Thu May 11, 2006 11:25 am Post subject: FAB and carb wear, '98 FP O-320 RV-6A

Checking some incidental things after the fuel tank SB was done (unusable fuel quantity and flow rates from each tank) I discovered how much havoc the engine vibes have been wreaking on FWF stuff since my last good look in there.  The carb heat flapper in the FAB has broken a hinge eyelet, the hinge has cracked away from one side of the FAB fiberglass sidewall, the flap itself, which used to lie flush inside a slightly smaller hot air intake hole, has fretted its way all the way through the aluminum FAB top so that in the full-open position it actually leaks induction air out the top of the FAB.  Most distressing to me was the realization that the vibration-motion of the FAB against the lower cowl intake scoop had caused the carb halves to fret and loosen considerably on their gasket, even though the 4 screws holding the upper and lower carb halves remain firmly safetied in their original positions.  The FAB and lower carb body to which it is bolted can be rocked easily left-

 to-right with trivial pressure on the air inlet portion of the FAB.

 

I had noted the abrupt appearance of gel-coat cracks in the cowling around all the front openings since my prop was balanced 2 years ago, and now this...  The prop and engine are much smoother-running than ever, but fatigue/wear seems to be escalating.  Probably a coincidental observation on an airframe that is starting to show its 580 hours, but curious just the same.  Maybe I can blame this on the P-mags  ...not.

 

I'm curious whether anyone else has experienced this thing with their carb and FAB gradually coming apart in pieces.

 

-Stormy

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ronlee(at)pcisys.net
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Posted: Thu May 11, 2006 12:53 pm Post subject: FAB and carb wear, '98 FP O-320 RV-6A

Yes indeed Stormy.  At my condition inspection in January, I had to replace

the carb heat hinge in its entirety and reinforce the top of the FAB where it

expands outboard to accommodate the air filter.   And there had been repairs

in that area before I got the plane.



RV-6A. O-360, over 1000 hours, FP prop, one LSE ignition



Ron Lee



At 01:24 PM 5/11/2006, you wrote:

 	  Quote: 	
		  



Checking some incidental things after the fuel tank SB was done (unusable 

fuel quantity and flow rates from each tank) I discovered how much havoc 

the engine vibes have been wreaking on FWF stuff since my last good look 

in there.  The carb heat flapper in the FAB has broken a hinge eyelet, the 

hinge has cracked away from one side of the FAB fiberglass sidewall, the 

flap itself, which used to lie flush inside a slightly smaller hot air 

intake hole, has fretted its way all the way through the aluminum FAB top 

so that in the full-open position it actually leaks induction air out the 

top of the FAB.  Most distressing to me was the realization that the 

vibration-motion of the FAB against the lower cowl intake scoop had caused 

the carb halves to fret and loosen considerably on their gasket, even 

though the 4 screws holding the upper and lower carb halves remain firmly 

safetied in their original positions.  The FAB and lower carb body to 

which it is bolted can be rocked easily left-

  to-right with trivial pressure on the air inlet portion of the FAB.



I had noted the abrupt appearance of gel-coat cracks in the cowling around 

all the front openings since my prop was balanced 2 years ago, and now 

this...  The prop and engine are much smoother-running than ever, but 

fatigue/wear seems to be escalating.  Probably a coincidental observation 

on an airframe that is starting to show its 580 hours, but curious just 

the same.  Maybe I can blame this on the P-mags  ...not.



I'm curious whether anyone else has experienced this thing with their carb 

and FAB gradually coming apart in pieces.



-Stormy

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV-List

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