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  #1  
Old 01-22-2017, 09:47 AM
jacksel jacksel is offline
 
Join Date: Jul 2005
Posts: 116
Default loose carb bottom

I have a MA-4-5 carb on my RV-6. I recently noticed the bolts connecting the 2 halves of the unit have become loose. The anti-rotation washers are still in place but somehow all the bolts are a little loose. It's possible to jiggle the whole bottom half of the carb. Do anyone sell a kit for repairing this sort of problem?
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  #2  
Old 01-22-2017, 10:05 AM
Kyle Boatright Kyle Boatright is online now
 
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,680
Default

Quote:
Originally Posted by jacksel View Post
I have a MA-4-5 carb on my RV-6. I recently noticed the bolts connecting the 2 halves of the unit have become loose. The anti-rotation washers are still in place but somehow all the bolts are a little loose. It's possible to jiggle the whole bottom half of the carb. Do anyone sell a kit for repairing this sort of problem?
I've seen that. My experience was that all you need to do is buy 4 new tabbed washers, disassemble, then reassemble using the new washers.
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Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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  #3  
Old 01-22-2017, 10:20 AM
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Tbone Tbone is offline
 
Join Date: Jan 2006
Location: South
Posts: 526
Default Check

I believe that there is a SB for that issue. You should check their website.
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RV7
XP IO360
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  #4  
Old 01-22-2017, 11:11 AM
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snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,122
Default Marvel Schebler SB-17

Quote:
Originally Posted by Tbone View Post
I believe that there is a SB for that issue.
Yes. It's Marvel Schebler SB-17 from 2010. Those screws are supposed to be checked for tightness every 100 hours...which reminds me
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  #5  
Old 01-22-2017, 11:18 AM
YellowJacket RV9 YellowJacket RV9 is offline
 
Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,330
Default

When I was watching mine get rebuilt, the guy mentioned that many times people don't properly engage the tabs enough to stop the heads from rotating. He also emphasized to position the anti rotation tab that points downward so it can't rotate counterclockwise past the corner of the carb, it it should already be rotated as far ccw as possible.

Chris
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RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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  #6  
Old 01-22-2017, 09:34 PM
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Fred.Stucklen Fred.Stucklen is offline
 
Join Date: Oct 2006
Location: Brooksville, FL
Posts: 428
Default Carb Issue

We just had this happen to a PA-28-180 on the field, twice within 10 Hrs. Finally took the carb down, did what the SB required, but also put the screws back in with Locktite...

Quote:
Originally Posted by jacksel View Post
I have a MA-4-5 carb on my RV-6. I recently noticed the bolts connecting the 2 halves of the unit have become loose. The anti-rotation washers are still in place but somehow all the bolts are a little loose. It's possible to jiggle the whole bottom half of the carb. Do anyone sell a kit for repairing this sort of problem?
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Fred Stucklen
wstucklen1@cox.net
RV-7A N924RV Flying (1965 Hrs & counting)
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)

First 2021 Contribution done
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  #7  
Old 01-23-2017, 06:41 AM
fixnflyguy fixnflyguy is offline
 
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,468
Default Check your FAB fit

I had this issue on my -4, and aside from the above posts, the carb gets alot of side-to-side movement from the snorkle of the FAB if it has a very tight rubber seal at the front end. The engine moves around from torque and start-up/shut-down. I had to do a little re-work of the seal on mine to allow a bit more flex in the seal.
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RV-4/N76WE
8A7 / Advance NC
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  #8  
Old 01-24-2017, 12:33 AM
jpowell13 jpowell13 is offline
 
Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 719
Default What I do

It happened to me too. I was getting engine hesitation when I advanced the throttle and deiseling on shutdown. Now, I reach into the air inlet with my fingers every preflight to make sure the air box doesn't wiggle due to a loose carb bowl. John
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  #9  
Old 01-24-2017, 01:32 PM
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snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,122
Default good idea

Quote:
Originally Posted by jpowell13 View Post
I reach into the air inlet with my fingers every preflight to make sure the air box doesn't wiggle due to a loose carb bowl.
May I steal your idea?
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  #10  
Old 01-24-2017, 11:10 PM
jpowell13 jpowell13 is offline
 
Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 719
Default

Please do Snopercod
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