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Rebuild a Bendix?

Disassemble your servo and replaced the parts. There's info online about adjustments and returning it to service.

-Marc
 
Consider the possible outcome if you don’t get it right. Instead of the standard flow bench test, you’ll be testing it on your first flight.
 
Walt said:
Consider the possible outcome if you don’t get it right. Instead of the standard flow bench test, you’ll be testing it on your first flight.
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Anytime you take a plane up for a first flight you are a test pilot - no matter who built or overhauled the parts. I had a problem with my AFP fuel injection system and I was told how to adjust it over the phone! I couldn't find anyone on the Left coast who knew about AFP and experimental. That's pretty much what you get when you work with Don unless you are local to his shop.

-Marc
 
Plummit said:
Anytime you take a plane up for a first flight you are a test pilot - no matter who built or overhauled the parts. I had a problem with my AFP fuel injection system and I was told how to adjust it over the phone! I couldn't find anyone on the Left coast who knew about AFP and experimental. That's pretty much what you get when you work with Don unless you are local to his shop.

-Marc
Click to expand...

Are you referring to normal idle mixture and speed adjustments? (Basically the same as adjusting Bendix/Silver Hawk)
 
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Just talked to support at Avstar and it's not the flow test that's the big deal. There are some specialty tools and a few procedures that made me lose interest in doing it myself. Going with the exchange.
 
Plummit said:
Anytime you take a plane up for a first flight you are a test pilot - no matter who built or overhauled the parts. I had a problem with my AFP fuel injection system and I was told how to adjust it over the phone! I couldn't find anyone on the Left coast who knew about AFP and experimental. That's pretty much what you get when you work with Don unless you are local to his shop.

-Marc
Click to expand...

Wait, so you were AOG and called Don, he told you how to fix it over the phone, and you're not happy with that outcome? Did I miss something here?

I would have been swinging wrenches and grinning like a cat, but that's just me...
 
Just a follow up. I contacted Airflow Performance about their "experimental overhaul". $1200 - $1400 with a two week turn around. So if you don't mind being down for a few weeks it's a good deal. They received my servo and divider yesterday. Will post an update when I'm back up and running.
 
airguy said:
Wait, so you were AOG and called Don, he told you how to fix it over the phone, and you're not happy with that outcome? Did I miss something here?
Click to expand...

First, I wasn't AOG. The engine was surging at lower RPMs (below 1500) and I just don't think that's right. I did try to resolve the issue but I was unsuccessful. I sent the servo and fuel distributor back to Don for an IRAN. The only thing they found wrong was a hole in the diaphragm in the fuel distributor which they replaced.

Don told me that my 3-blade Aero Composite prop was too light, and I needed a heavier prop for the flywheel effect to smooth out the surging.

Funny thing, I was at a fuel pump a few months later and a factory Pitts taxied up at idle. He had a Bendix fuel injection and a Hartzell composite prop. It was the smoothest running setup I've heard.

So yeah, I am unhappy with the outcome....

-Marc
 
Got the rebuilt servo/divider back last week and installed over the weekend. Total was $1350. Engine started up first try and idle was a bit low. Turned the screw 1-1/2 turns which ended up being a bit too much. Didn't have to touch the mixture adjustment. Perfect 50 rpm rise on cut off. Super happy with the experimental rebuild by AFP.
 
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