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Old 08-15-2017, 09:07 PM
Selma Selma is offline
Join Date: Oct 2010
Location: Berlin, Germany
Posts: 40
Default Leaky Carb

After 360 h TT (RV9a, O320 D1A) the gasket of the acceleration pump (Marvel-Schebler MA4SPA 10-5217) got leaky. The airfilter E-3260 has this notch cut out and RTV seal around the acc.pump. I guess vibrations to the acc.pump are the culprit

Does anyone has changed this design? How? I would be very thankful for your help. We are not the builder, bought it flying. Thanks.
flying RV9a
a father & son project

Last edited by Selma : 08-15-2017 at 09:20 PM.
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Old 08-16-2017, 06:13 AM
YellowJacket RV9 YellowJacket RV9 is offline
Join Date: Oct 2012
Location: Clearwater, FL / KZPH
Posts: 1,120

As seen in another thread today, the notch and RTV in the air filter are normal and per plans. I doubt that would cause vibrations and a leak. I had a similar issue with a leaking carb. I had it overhauled and has been flawless since. (I also had the main jet drilled up one size).

Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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Old 08-16-2017, 08:38 AM
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,617

The filter installation has no influence on causing a leak on the plunger seal.
This is a common issue on all types of aircraft with carb's that have an accelerator pump.
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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Old 08-20-2017, 04:04 AM
Selma Selma is offline
Join Date: Oct 2010
Location: Berlin, Germany
Posts: 40
Default Airfilter issues

Chris, Scott,
I thought you might be interested in reading this web page:

flying RV9a
a father & son project
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