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  #21  
Old 10-21-2021, 05:20 AM
rv8ch's Avatar
rv8ch rv8ch is online now
 
Join Date: Feb 2005
Location: LSGY
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Quote:
Originally Posted by bkervaski View Post
...

2) What are you finding at the 100 hour inspections?

Thanks!
Anyone find anything at the 100 hour inspection? I have one coming up, and it's not really that clear what to look for. The manual says this:

Quote:
Originally Posted by PmagManual LC114.28 p23
Remove ignition and examine shaft and drive gear condition. Note: Ignition disassembly is not necessary (and if done may void your warranty). Look for excessive play (lateral and axial). Shaft rotation should be free, with no catching, flat spots, or grinding. The shaft on ďPĒ models (with internal alternator) will have a push-pull rippling effect as the shaft turns and the permanent magnets pass the rotor poles. This is normal and expected. If a P model ignition does not have this magnetic ripple, the unit requires additional (shop) service.
Seems straightforward, but wanted to check with the brain trust beforehand, since I've seen them when they were new, but not 100% sure I would recognize a problem by wiggling the shaft.
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  #22  
Old 10-21-2021, 06:21 AM
rockbottom rockbottom is offline
 
Join Date: Nov 2009
Location: Fayetteville, GA
Posts: 57
Default Shaft play

Mickey,

At my last conditional inspection in February I had one of my pmags where there was lateral play in the shaft that amounted to about 1 mm total from side to side, maybe even a little less. The other pmag had absolutely none. I spoke to Brad about it over the phone and decided to send both units in. At the time, I had been flying the plane almost two years and had just over two hundred hours on it and had not had any problems with either unit.

When I got them back, the shafts on both units were rock solid. Brad didnít say if there was any acceptable tolerance with shaft play, but convinced me that it was better to have them looked at than run the risk of internal damage or failure if shaft lateral play were to increase. Other than obvious repairs, I donít know what all they check or service when they receive units in from customers, but in my case they also updated the software to version 41. I was also concerned about any possible damage due to excessive heat as the temp stickers on both units had tripped at just under 200 degrees.

I have to admit that pulling the pmags out far enough to conduct this inspection every year is a bit of a pain, but Iím happy with their performance so far and the customer service from Emagair has been excellent.

J Baker
RV8
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  #23  
Old 10-21-2021, 06:58 AM
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rv8ch rv8ch is online now
 
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Quote:
Originally Posted by rockbottom View Post
Mickey,

At my last conditional inspection in February I had one of my pmags where there was lateral play in the shaft that amounted to about 1 mm total from side to side, maybe even a little less. The other pmag had absolutely none. I spoke to Brad about it over the phone and decided to send both units in. At the time, I had been flying the plane almost two years and had just over two hundred hours on it and had not had any problems with either unit.

When I got them back, the shafts on both units were rock solid. Brad didnít say if there was any acceptable tolerance with shaft play, but convinced me that it was better to have them looked at than run the risk of internal damage or failure if shaft lateral play were to increase. Other than obvious repairs, I donít know what all they check or service when they receive units in from customers, but in my case they also updated the software to version 41. I was also concerned about any possible damage due to excessive heat as the temp stickers on both units had tripped at just under 200 degrees.

I have to admit that pulling the pmags out far enough to conduct this inspection every year is a bit of a pain, but Iím happy with their performance so far and the customer service from Emagair has been excellent.

J Baker
RV8
Thanks Jim - this is very helpful. I would not have thought that 1mm shaft play is enough to take them out of service, but if that's what Brad says, I'll of course follow his advice. I'm also really happy with the performance of these pmags.
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  #24  
Old 06-08-2022, 10:04 PM
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bruceh bruceh is offline
 
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Doing my annual condition inspection at 981 hours. I have pulled off both P-mags and on my right one, there is more play in the bearings than I think might be acceptable. The left one has just a real tiny bit of play, but you can definitely tell it isn't completely and solidly rotating without any bearing play.

The maintenance guide doesn't give any specifics for bearing tolerances. It simply says the following:
"Look for excessive play (lateral and axial). Shaft rotation should be free, with no catching, flat spots, or grinding."
I took a short video of the play in the right P-mag here.

How much play here is "excessive"?
I don't recall ever having this much play in previous inspections.

I had the P-mags firmware updated and gone over in 2018 ago when I had around 550 hours on them.
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  #25  
Old 06-09-2022, 12:09 AM
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erich weaver erich weaver is offline
 
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That looks like it should be sent in and fixed up to me, but hey, why not provide the link to the video to Brad at Emag and let him judge?
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  #26  
Old 06-09-2022, 05:57 AM
Cth6 Cth6 is offline
 
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Location: Central Florida
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Quote:
Originally Posted by bruceh View Post
Doing my annual condition inspection at 981 hours. I have pulled off both P-mags and on my right one, there is more play in the bearings than I think might be acceptable. The left one has just a real tiny bit of play, but you can definitely tell it isn't completely and solidly rotating without any bearing play.

The maintenance guide doesn't give any specifics for bearing tolerances. It simply says the following:
"Look for excessive play (lateral and axial). Shaft rotation should be free, with no catching, flat spots, or grinding."
I took a short video of the play in the right P-mag here.

How much play here is "excessive"?
I don't recall ever having this much play in previous inspections.

I had the P-mags firmware updated and gone over in 2018 ago when I had around 550 hours on them.
Lets us know what you find out from emag.
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  #27  
Old 06-09-2022, 09:16 AM
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drill_and_buck drill_and_buck is offline
 
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Here is a video of my PMAG that had too much lateral play and was sent back to the factory for repair.

https://photos.app.goo.gl/YQsWD8mBRi9VKpSJA

Bearings replaced after 805.6 hours Tach time
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Last edited by drill_and_buck : 06-09-2022 at 11:31 AM.
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  #28  
Old 06-09-2022, 09:57 AM
Dad's RV-10 Dad's RV-10 is online now
 
Join Date: Jan 2005
Location: FL Gulf Coast & NYC
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Quote:
Originally Posted by bruceh View Post
Doing my annual condition inspection at 981 hours. I have pulled off both P-mags and on my right one, there is more play in the bearings than I think might be acceptable. The left one has just a real tiny bit of play, but you can definitely tell it isn't completely and solidly rotating without any bearing play....


...I had the P-mags firmware updated and gone over in 2018 ago when I had around 550 hours on them.
To be clear, the P-Mags have a total of 981 hours on them? And 431 hours ago (at 550 hours) they were serviced to include new bearings?

Just trying to get some data points. Keep us posted!
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  #29  
Old 06-09-2022, 05:36 PM
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pilotkms pilotkms is offline
 
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Location: WARNER ROBINS, GA
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Both of the videos above appear to contain excessive play. I pull mine every 100 hours and both of mine have 0 play compared to the ones in the videos. Mine just passed 930 hours. Iíd be sending those in for bearing replacement.
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RV 7A RV #9700 May 2017
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  #30  
Old 06-09-2022, 07:42 PM
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bruceh bruceh is offline
 
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I called Emagair today and left voicemail but did not get a call back. I've downloaded the repair request form and will be sending both of them in for the flat fee checkup.

I don't know if the bearings were replaced previously at 550 hours. I'm going to guess they were not.

I haven't had any ignition related issues, but this is why we do annual inspections to catch problems before they happen!
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