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  #1  
Old 06-27-2020, 02:42 PM
kaweeka kaweeka is offline
 
Join Date: May 2011
Location: Roseville
Posts: 408
Default F--- up of the day, week, maybe year!

I removed my propeller last week to change the front flywheel seal. The prop is a constant speed Hartzel. After removal, close inspection showed a dry seal. No need to change it. There is a small leak from the seam of the case. Got it back together, safety wired on then started it up for a ground check. Typical airport project... people cone and go during the task, wanting to know all about what you're doing. All went well going back together, I thought, until I cycled the prop and there was no RPM change. Oil pressure good. Then the the cold realization that I screwed up! After removing the propeller, I found what I thought. I had left a paper towel in the hub. There it was, sitting right there. I removed it and put the prop back on. Ground run up and..... still no RPM change. So, obviously, not all of the paper towel was in sight. So, I'm looking for a little guidance here. I'll sent the prop to Stockton Propeller for inspection. What about the oil line or the prop governor? Is there a need to take that off and have it inspected as well? This is an expensive mistake. Distractions can certainly be costly, not to mention deadly. How embarrassing!
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RV-9A N435KR, Vans calendar March 2018
LIO 320 B1A, Dual LS Plasma III, AFP injection
G3x touch
Roseville, Ca

Last edited by kaweeka : 06-27-2020 at 02:44 PM.
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  #2  
Old 06-27-2020, 03:04 PM
74-07 74-07 is offline
 
Join Date: Dec 2016
Location: Greenville, SC
Posts: 542
Default

it can take much longer than usual for the prop to cycle, the first time, after it's been off. how long did you wait when cycling it?
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  #3  
Old 06-27-2020, 03:08 PM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,210
Default

Air bubble in there. Keep cycling it.
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built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
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  #4  
Old 06-27-2020, 03:29 PM
esco esco is offline
 
Join Date: Jan 2011
Location: SoCal
Posts: 401
Default Inspect the residue

Still got the offending paper towel?

Carefully unfold and examine if you can; you'll know you got it all...
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RV-9A sold (I miss that bird!)
RV10 sold (miss that one too!)
RV-14A build underway
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  #5  
Old 06-27-2020, 06:01 PM
kaweeka kaweeka is offline
 
Join Date: May 2011
Location: Roseville
Posts: 408
Default

Quote:
Originally Posted by esco View Post
Still got the offending paper towel?

Carefully unfold and examine if you can; you'll know you got it all...
I went back to the airport and looked. It's missing about 25% of the paper towel and I can see some of it way down in the hub. Couldn't get much out.

RATS!!!!!
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RV-9A N435KR, Vans calendar March 2018
LIO 320 B1A, Dual LS Plasma III, AFP injection
G3x touch
Roseville, Ca
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  #6  
Old 06-27-2020, 06:36 PM
esco esco is offline
 
Join Date: Jan 2011
Location: SoCal
Posts: 401
Default Wind your watch...

Now that you have a better understanding, you might pause further disassembly, call governor manufacturer (Hartzell, Aero Technologies...) on Monday.

Thank you for posting this.
I learned from your experience, maybe others will as well.
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  #7  
Old 06-27-2020, 08:41 PM
Chkaharyer99 Chkaharyer99 is offline
 
Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 850
Default

David,

You are part of a surgical team.

"As part of the overall tracking of items in the operating room (Hangar), each facility (Experimental Pilot working on their aircraft) should have a policy for surgical counts (Tool Inventory) that specifies when they should be performed and by whom, what items (Paper towels) should be counted and how counts (including incorrect counts) should be documented. A specific procedure for counting should be established to ensure that the protocols are standardized and familiar to operating room personnel."

You are an expert my friend. Endoscope?

This probably wouldn't have happened if you were still parking it on the south side. Not many Lookie Lou's in these parts.

Wish you the best.
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RV-8
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  #8  
Old 06-27-2020, 10:20 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,738
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Quote:
Originally Posted by kaweeka View Post
I went back to the airport and looked. It's missing about 25% of the paper towel and I can see some of it way down in the hub. Couldn't get much out.

RATS!!!!!
The oil (and towel) is trapped in the crank chamber. The collar feeds oil through the crank into the chamber, and it leaks back out to the collar. Carefully dig in the crank cavity and get the remains of that towel. I would prepare to pressurize the oil feed to the collar with external oil to push any towel in the cross tube back in the crank cavity. Call a reputable engine builder and ask what they recommend. And . . if pressurizing will push the towel back into the cross tube (from the collar volume). I think it will but some could remain and get into the bearing. That could starve oil pressure there. Not good if that happens.

Good luck. I will now only use cotton towels to prevent this.
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RV-7
Lord Kelvin:
I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.

Last edited by BillL : 06-28-2020 at 06:19 AM.
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  #9  
Old 06-28-2020, 07:32 AM
kaweeka kaweeka is offline
 
Join Date: May 2011
Location: Roseville
Posts: 408
Default

I attempted to get out what I could with a very small hook but it wasn't much. I'll call Stockton Propeller Monday and humbly admit my mistake. After a good laugh, they'll pick it up and get it back to working order. I will also ask about my prop governor. If they think it should go in as well, so be it. Thanks for the replies everyone. Lesson learned!
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RV-9A N435KR, Vans calendar March 2018
LIO 320 B1A, Dual LS Plasma III, AFP injection
G3x touch
Roseville, Ca
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  #10  
Old 06-28-2020, 09:15 AM
p51dplt p51dplt is offline
 
Join Date: Nov 2012
Location: Nut Tree, CA
Posts: 163
Default

Pull your governor. There is usually a small screen imbedded in the gasket to keep foreign matter from getting into the governor.

Good luck
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Top Cover Aviation
Nut Tree, CA
P-51, RV-8, 90A, S1
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