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  #11  
Old 02-03-2017, 06:22 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,061
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First hoisting the airplane by the engine lift ring is a terrible idea. The crankcase simply was not designed to take that kind of load. The airplane can be hoisted by the engine mount tubes.
Likewise the oversizing of the gear mount holes is not a good idea. The accepted method of doing this is to tack weld a doubler washer made from 4130 flat stock or tubing to the front side of the gear socket. Then remove the engine mount/gear mount and repeat on the aft side. Remove the gear legs and weld the doublers all around.
There are simply no shortcuts to this procedure. No amount of over torque on the gear leg bolts is going to keep the gear from rotating if the holes are oversize and/or elongated. This can also be done entirely off the airplane on the taildraggers by mounting the engine/gear mount to a fixture that duplicates the position on the fuselage. Very small tack welds letting the mount cool between the tacks. DON'T get the gear legs hot.
Quite a few years ago Harmon had some issues with the heat treating company resulting in some gears that were softer than specified and much more likely to bend. A properly heat treated gear will take a tremendous amount of abuse without bending.
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  #12  
Old 02-03-2017, 06:43 PM
roadrunner20's Avatar
roadrunner20 roadrunner20 is offline
 
Join Date: Feb 2005
Location: Bay Pines, FL (based @ KCLW)
Posts: 1,802
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Quote:
Originally Posted by jrs14855 View Post
There are simply no shortcuts to this procedure. No amount of over torque on the gear leg bolts is going to keep the gear from rotating if the holes are oversize and/or elongated.
FWIW, the holes are not elongated. Mount & gear holes are the same size. No rotating. This process was coordinated with Vans and Langaire.
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Dan "RoadRunner" Landry
Morphed RV7, N20DL, PNP Pilot
1050+ hours, hit 1000 enroute to Oshkosh
2017 Donation Paid

Last edited by roadrunner20 : 02-03-2017 at 06:48 PM.
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  #13  
Old 02-04-2017, 11:13 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,499
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Quote:
Originally Posted by jrs14855 View Post
First hoisting the airplane by the engine lift ring is a terrible idea. The crankcase simply was not designed to take that kind of load. The airplane can be hoisted by the engine mount tubes.
Likewise the oversizing of the gear mount holes is not a good idea. The accepted method of doing this is to tack weld a doubler washer made from 4130 flat stock or tubing to the front side of the gear socket. Then remove the engine mount/gear mount and repeat on the aft side. Remove the gear legs and weld the doublers all around.
There are simply no shortcuts to this procedure. No amount of over torque on the gear leg bolts is going to keep the gear from rotating if the holes are oversize and/or elongated. This can also be done entirely off the airplane on the taildraggers by mounting the engine/gear mount to a fixture that duplicates the position on the fuselage. Very small tack welds letting the mount cool between the tacks. DON'T get the gear legs hot.
Quite a few years ago Harmon had some issues with the heat treating company resulting in some gears that were softer than specified and much more likely to bend. A properly heat treated gear will take a tremendous amount of abuse without bending.
Actually the process Dan used is approved and a good way to correct the problem. The only real down side is that the X or Y over sized bolts are kind of expensive, but worth it because it is usually the easiest way to resolve the problem.

I agree that you should never use the engine lifting ring to left up the entire airplane though.........
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RV-6A (aka "Junkyard Special ")
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