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stucklfw(at)westinghouse.
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 Posted: Thu Oct 22, 2009 3:37 am Post subject: Front Gear Leg Bolt Hole Wear |
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I posted this on the Van's Airforce site last week, but thought that it might be a good idea to add it to this site as well. The type of locktite I think was #609, but am not sure as the container label has worn off..
It's interesting to note that , while the front gear leg mounting holes have worn, there haven't been any reported instances of the main gear leg mounting hole wearing…. This front gear fix probably should be used on all new assemblies…..
Fred
Hi All,
I just got done repairing the front gear leg mount bolt hole on my RV-7A a while back. There was a slight bit of wear due to the bolt either loosening and/or the front fork being too tight, causing excessive torque on the gear leg during turns. In any case, there was a slight amount of rotation in the gear leg with the bolt loose, indicating that the bolt holes were slightly oblong...
Here's what I did to fix the problem. First I tied down the tail, and removed the front gear leg. Next, I cleaned both the top mount area and the lower mount area of any grease. I did the same to the gear leg, but re-greased the lower mount area where it comes into contact with the mount. Then I applied permanent Lock-Tight to the inside of the upper mount area, and also coated the top mount area of the gear leg. The gear leg was then inserted back into the mount and the bolt partially re-inserted. (My bolt inserts from the top. The firewall has an indentation for the nut. There is no hole in the firewall for the bolt...).
Next I used a small amount of "Liquid Steel" into the worn areas of the gear leg mounting bolt holes. (Since there was very little wear, I did this instead of drilling out the mount/gear to a larger size bolt, or inserting a taper pin.) The bolt was then torqued normally. I let the assembly dry before testing it for any movement. Solid....
I've flown over 100 Hours after that fix was performed, and still have no movement in the front gear leg upper mount area. I have checked it at every oil change for any signs of movement....
With the history of issues in this area, it would seem prudent to do the final front gear leg assembly with Lock-Tight on the upper mount area. This would prevent the re-occurring issue that we've seen in this area on the -A RV models.... And I've seen it happen to every RV-XA that I've owned....
__________________
Fred Stucklen
RV-7A N924RV Flying
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)
[quote][b]
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kahamer(at)bigpond.net.au
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| Posted: Thu Oct 22, 2009 4:45 am Post subject: Front Gear Leg Bolt Hole Wear |
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I used LOCTITE 680 on top and bottom area(nose gear) and no movement after 90 hours any more……
Karl
7A
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Stucklen, Frederic W
Sent: Thursday, 22 October 2009 10:19 PM
To: rv-list(at)matronics.com
Subject: Front Gear Leg Bolt Hole Wear
I posted this on the Van's Airforce site last week, but thought that it might be a good idea to add it to this site as well. The type of locktite I think was #609, but am not sure as the container label has worn off..
It's interesting to note that , while the front gear leg mounting holes have worn, there haven't been any reported instances of the main gear leg mounting hole wearing…. This front gear fix probably should be used on all new assemblies…..
Fred
Hi All,
I just got done repairing the front gear leg mount bolt hole on my RV-7A a while back. There was a slight bit of wear due to the bolt either loosening and/or the front fork being too tight, causing excessive torque on the gear leg during turns. In any case, there was a slight amount of rotation in the gear leg with the bolt loose, indicating that the bolt holes were slightly oblong...
Here's what I did to fix the problem. First I tied down the tail, and removed the front gear leg. Next, I cleaned both the top mount area and the lower mount area of any grease. I did the same to the gear leg, but re-greased the lower mount area where it comes into contact with the mount. Then I applied permanent Lock-Tight to the inside of the upper mount area, and also coated the top mount area of the gear leg. The gear leg was then inserted back into the mount and the bolt partially re-inserted. (My bolt inserts from the top. The firewall has an indentation for the nut. There is no hole in the firewall for the bolt...).
Next I used a small amount of "Liquid Steel" into the worn areas of the gear leg mounting bolt holes. (Since there was very little wear, I did this instead of drilling out the mount/gear to a larger size bolt, or inserting a taper pin.) The bolt was then torqued normally. I let the assembly dry before testing it for any movement. Solid....
I've flown over 100 Hours after that fix was performed, and still have no movement in the front gear leg upper mount area. I have checked it at every oil change for any signs of movement....
With the history of issues in this area, it would seem prudent to do the final front gear leg assembly with Lock-Tight on the upper mount area. This would prevent the re-occurring issue that we've seen in this area on the -A RV models.... And I've seen it happen to every RV-XA that I've owned....
__________________
Fred Stucklen
RV-7A N924RV Flying
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)
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No virus found in this incoming message. Checked by AVG - www.avg.com 270.14.19/2438 - Release Date: 10/21/09 16:44:00 [quote][b]
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Dale Ensing
Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC
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| Posted: Thu Oct 22, 2009 5:29 am Post subject: Front Gear Leg Bolt Hole Wear |
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Thanks Fred,
Could you give us some tech data on the "Liquid Steel" please?
Dale Ensing
[quote] ---
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC |
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