Go Back  RCU Forums > RC Airplanes > Questions and Answers
Reload this Page >

repairing engine mount flanges

Notices
Questions and Answers If you have general RC questions or answers discuss it here.

repairing engine mount flanges

Old 03-13-2003, 10:39 AM
  #1  
Anchorboy46
Thread Starter
My Feedback: (6)
 
Anchorboy46's Avatar
 
Join Date: Jan 2003
Location: Crockett, TX
Posts: 33
Likes: 0
Received 0 Likes on 0 Posts
Default repairing engine mount flanges

I have an engine with the holes drilled out on two of the four holes of the engine mounting flange. Some idiot before me drilled them out to the point where the hole is broke all the way out. Does anybody weld this flange shut and re-drill the holes? Is it possible to do without ruining the motor? Is Tig welding possible? How about Mig? Shown in picture. Mike
Attached Thumbnails Click image for larger version

Name:	62639_25032.jpg
Views:	15
Size:	33.4 KB
ID:	38455  
Old 03-13-2003, 01:26 PM
  #2  
mglavin
My Feedback: (31)
 
Join Date: Nov 2001
Location: Elverta, CA
Posts: 5,295
Likes: 0
Received 0 Likes on 0 Posts
Default repairing engine mount flanges

I'd be willing to bet a GOOD tig welder could repair this for you. Only concern I'd have is distortion. An experienced individual (welder) could take the required precautions to assure this would not happen.
Old 03-13-2003, 05:33 PM
  #3  
MinnFlyer
Senior Member
My Feedback: (4)
 
MinnFlyer's Avatar
 
Join Date: Apr 2002
Location: Willmar, MN
Posts: 28,519
Likes: 0
Received 5 Likes on 5 Posts
Default repairing engine mount flanges

Cast Aluminum is extremely difficult to weld. Put a washer on the bolt, and bolt her in.
Old 03-13-2003, 05:52 PM
  #4  
Tattoo
Senior Member
 
Join Date: Feb 2002
Location: Wichita, KS,
Posts: 2,123
Likes: 0
Received 0 Likes on 0 Posts
Default repairing engine mount flanges

Another option is to get with the quickee guys in your area and find out about back plate engine mounts that bolt directly to the firewall. Pretty slick.

If it was my engine, I'd just drill another mount hole in clean metel next to the old busted out hole.
Old 03-13-2003, 06:12 PM
  #5  
mulligan
Senior Member
 
mulligan's Avatar
 
Join Date: Apr 2002
Location: Sanford, FL
Posts: 1,147
Likes: 0
Received 0 Likes on 0 Posts
Default repairing engine mount flanges

This looks like a fairly small engine. Your LHS should have universal mounts that don't use bolts to attach the engine to the mount rails. Rather, a strap is used to hold the flange against the mount rails. I've seen this on a couple of trainer ARFs, and it seems to work well.

Just another option.

- George

http://www2.towerhobbies.com/cgi-bin...?&I=LXL207&P=7
Attached Thumbnails Click image for larger version

Name:	62686_7331.jpg
Views:	13
Size:	13.2 KB
ID:	38456  
Old 03-13-2003, 06:35 PM
  #6  
scalebldr
Senior Member
My Feedback: (7)
 
Join Date: Nov 2002
Location: allenstown, NH
Posts: 542
Likes: 0
Received 0 Likes on 0 Posts
Default aluminum solder

there is an aluminum solder availabe,got mine one ebay a few years ago that melts at about 700 degrees so you use a propane torch and a stainless brush to clean the part being soldered.remove all parts from case and solder all broken holes closed.file the solder down to the flange to provide a good level/smooth mounting surface after drilling new mounting holes.
Old 03-13-2003, 07:30 PM
  #7  
daver29
Member
 
Join Date: Jan 2003
Location: Bellevue, NE
Posts: 53
Likes: 0
Received 0 Likes on 0 Posts
Default repairing engine mount flanges

Clean area well
fill with tightly packed JB weld...
let cure
grind down to shape
drill new hole
Done
Old 03-13-2003, 07:47 PM
  #8  
mglavin
My Feedback: (31)
 
Join Date: Nov 2001
Location: Elverta, CA
Posts: 5,295
Likes: 0
Received 0 Likes on 0 Posts
Default repairing engine mount flanges

OK, I'm guessing here but the engine in question is an old McCoy control line engine. That said I suspect it's more of a restoration project the a I wan to use it project.

As I noted earlier take it to a professional welder and see what they think. I have a TIG welder and have good success welding stuff with it, including cast aluminum. Techniques and knowledge is were it's at and what your after.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.