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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 |
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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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Larry Bowen
Joined: 09 Jan 2006
Posts: 802
Location: NC, USA
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| Posted: Thu May 11, 2006 1:03 pm Post subject: FAB and carb wear, '98 FP O-320 RV-6A |
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I looked a that area on mine just last night. Seemed to be in good shape,
but I'm only at a measly 180 Hrs.
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Larry Bowen
Larry(at)BowenAero.com
http://BowenAero.com
[quote] --
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_________________
Larry Bowen
RV-8 SOLD,
RV-7QB in progress... |
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WVSWIFT(at)aol.com
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| Posted: Fri May 12, 2006 1:47 am Post subject: FAB and carb wear, '98 FP O-320 RV-6A |
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OH, PS:
This RV4 has a O-320 H engine with a wood prop.
Eddie
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WVSWIFT(at)aol.com
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| Posted: Fri May 12, 2006 1:47 am Post subject: FAB and carb wear, '98 FP O-320 RV-6A |
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Stormy"
My wife did a condition inspection on General Waskow's RV4 and she found
also the FAB flapper completely worn out and beginning to come apart.
She rebuilt the flapper but used heavier material and a different hinge
material that is forged in place of the bent type.
Eddie
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