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  #1  
Old 08-23-2016, 01:18 PM
carlmeek carlmeek is offline
 
Join Date: Aug 2016
Location: UK
Posts: 3
Angry Prop/Governor Problem - Help!

I have the following on my RV-10, all bought new from Vans.

YIO-540 D4A5
MT 3 blade prop
Hartzell Governor

The prop isn't moving at all - it just stays on full fine.

- I have checked the bungs in the engine, and sent photos to local experts who have agreed it's all correct. Front bung removed, back bung in place.
- I have tested the prop with compressed air. About 75psi got it moving, and a bunch of oil squirted in my face. Once all the oil had cleared and i'd exercised it a few times, it was starting to struggle to hold the pressure - it was leaking out as fast as it was going in, and holding about 75psi.
- I've checked the governor is being driven (it is) and that the flyweights and things are not stuck inside, its all smooth as silk. I've also checked the pressure relief valve, and it all looks good.
-Both the prop and the governor are full of oil
-I've checked the lever on the governor moves fully from stop to stop, it does.
-I've run the engine for nearly 1 hour in total now, at many different RPM settings including 2700. I've exercised the lever many, many times. I've tried leaving it course, and leaving it fine, for several minutes.

I'm now desparate for ideas.

- I spoke to MT who after asking lots of questions and reviewing photos blame the govenor. They say that 75-80 psi is correct for it to start moving.
- I spoke to Hartzell who have confirmed everything looks in order, and have suggested i ship it off to a prop shop for testing. They said it's extremely unlikely there's a problem with it.

What else could the problem be? Help!!
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  #2  
Old 08-23-2016, 01:29 PM
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bret bret is offline
 
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When I first put my prop on and fired up, it took several minutes of applying full course back to fine, several times to bleed the system, there is at least a qt of oil that needs to get bled through there. it did not move at first like you are explaining.
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Last edited by bret : 08-23-2016 at 01:29 PM. Reason: sp
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  #3  
Old 08-23-2016, 01:52 PM
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Jesse Jesse is offline
 
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Location: X35 - Ocala, FL
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Are all part new from Van's? I had a governor once that wouldn't run the prop. Turns out it was running backwards (came off an installation with a Subaru). I sent it to a prop shop and they pulled a plug and out it in somewhere else and then it worked right. Also, it can take some time to get the prop to change pitch the first time.
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  #4  
Old 08-23-2016, 03:11 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by carlmeek View Post
What else could the problem be? Help!!
Was there a plug installed in the front portion of the crankshaft as is often done for shipping?

If so, did you remove it before installing the propeller?
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  #5  
Old 08-23-2016, 03:55 PM
Michael Henning Michael Henning is offline
 
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What rpm are you cycling the prop at? I needed 1900 rpm to get my whirlwind to cycle the first time.
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  #6  
Old 08-23-2016, 06:14 PM
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Larco Larco is offline
 
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Quote:
Originally Posted by Michael Henning View Post
What rpm are you cycling the prop at? I needed 1900 rpm to get my whirlwind to cycle the first time.
Yes. Sometimes a higher RPM is necessary. Some will cycle at 1400 others will need up up to 1900
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  #7  
Old 08-23-2016, 06:35 PM
BobTurner BobTurner is online now
 
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Not sure how oil squirted on your face. Did you test the prop on the engine, with compressed air into the governor output port? Did the oil leak out after you removed the compressed air rubber tip?
Is the O ring on the prop flange in place?
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  #8  
Old 08-23-2016, 10:45 PM
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Carlos151 Carlos151 is offline
 
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Check your oil line from the governor to the front engine fitting. After multiple attempts at higher RPM's, the prop would not cycle. I removed the line to inspect it and found the problem when no oil came out even though the governor had oil in it. The line that came with my engine was full of preservative grease (don't know why). Ran compressed air through the line and the large glob of grease came out. Flushed it, re-installed and everything works great.
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  #9  
Old 08-24-2016, 01:10 AM
JDanno JDanno is offline
 
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Double check that the prop governor is running the correct direction. I had trouble with my prop and it turned they had sold me a PG that was turning backwards so no oil was properly coming out.
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  #10  
Old 08-24-2016, 01:46 AM
carlmeek carlmeek is offline
 
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Thanks For the Updates? here are the answers?..

Bret - I?ve now run for nearly an hour with tens and tens of lever movements and RPM changes, air should be gone by now.

Jesse - Yes, all brand new from Vans. Hartzell asked for a photo of the baseplate and verified that the plugs are in the right place - so i think this is OK.

RVBuilder2002 - Yes, there was a plug in the front of the crank. I punched a hole and ripped it out. I?ve taken photos of the back of the prop flange, and the front of the engine showing the rear plug and oil line, and MT and Hartzell have verified these look fine.

Michael - I?ve tried all RPM settings right up to 2700. I was typically testing at 2000+. Not even a tiny amount of movement in the pitch detected. Prop lever does nothing.

BobTurner - Oil squirted at me from 2 places. When inserting shop air into the governor plate that feeds to the prop, initially oil gurgled and squirted back at me through the oil feed line to the governor. Secondly when i pulled out my rubber bung that was allowing me to put shop pressure to the prop, oil fired at me everywhere! ( I guess i should have let the pressure drop first! )

Carlos - This is a front mounted governor, so i don?t think this applies - there is no oil line as such, just all internal oil galleries.

JDanno - I?m not really sure how to prove the governor is running in the right direction?.. any thoughts on how? This sounds like it really could be a possibility - but Hartzell haven?t suggested this could be a problem.


This morning i?m going to follow this test procedure from Lycoming:

http://www.lycoming.com/Portals/0/te...0Procedure.pdf

This should establish that the crank is holding the expected pressure. If this fails?. then it is at least narrowed down to prop versus governor, and governor looking likely.

Ideally i need a spare governor, but i have no idea who would have one!!
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