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Old Mar 22, 2015, 07:12 PM
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Question
Repairing intake tube on OS61FS

I've got this old OS61FS that was running fine until my FB corkscrewed my Cub into the ground for me. The engine was pushed back into the fuse and it creased the intake tube. Do you guys think I can just take this off, heat it up and run a screwdriver or something through it to expand it back to close to its original shape? I doubt I'll be able to find a replacement part unless someone's just got one laying around in a junk box. It was a sweet running engine until it was crashed.
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Old Mar 22, 2015, 08:09 PM
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The 90 degree bend looks ok, as does the section that enters the carburetor. There's no heat to worry about. Could you splice a new section of K&S tubing in between? ... just a thought.
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Old Mar 22, 2015, 08:16 PM
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Intake tube

The Magnum and ASP engines are clones of the OS line. You may be able to substitute a tube from either HK or Hobby People.
Good luck,
Jim
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Old Mar 22, 2015, 08:58 PM
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Perhaps if you could mount the carb in a different position then a repaired part wouldnt need to be that precise like maybe the laser line of engines for example . That said I must congratulate you on the crash , that tube is knackered ! Cheers the pope
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Old Mar 23, 2015, 06:08 AM
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If you have the tools, you could replace the tube with a new one by making it. But maybe splicing in a new tube would work too. Silver solder the splice or JB Weld epoxy it maybe. I think there are some tubing sizes that would work from the K&S metals display at hobby shops or ACE hardware or Hobby Lobby or stores like that.
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Old Mar 23, 2015, 07:47 AM
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Hadn't thought about a Magnum tube replacement. I guess that'd be the best first option, to see if I could get a replacement from them. And I swear Pope, it was my FB that crashed it not me! LOL
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Old Mar 23, 2015, 09:16 AM
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If you use a Magnum intake manifold be sure the face connecting bolts to the head are correctly orientated. Newer Magnum manifolds changed their bolt pattern on their newer engines from the old engines, so make sure you get the correct one.
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Last edited by Chip01; Mar 23, 2015 at 09:22 AM. Reason: typo
Old Mar 23, 2015, 09:19 AM
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There is a compound bend in the tube and it's smashed in that area. It doesn't look like cutting and splicing will be a simple fix.

Which Sanye (ASP, Mangum) engine do you guys suggest for substitution? I can't think of one that will be a drop in.

Greg
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Old Mar 23, 2015, 10:02 AM
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What's an FB?

Pretty tricky to repair that damage .... but, I have seen crushed tubes that have been successfully ironed out. Worth a go.

Could even try plastic tube, or thin-walled silicone tubing, slotted onto the stub of the damaged manifold. I think that might give you a fairly pleasing repair.

Alternatively, one could be fabricated from straight brass tube. It won't matter that the joint is 90 degrees, rather than a smooth bend. Of course, if you can bend that K and S stuff, then that's even better.

Or, you might have the carb fastened to a short stub, like on my YS.... see pic below.
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Old Mar 23, 2015, 01:42 PM
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If this is any help, here are some pictures of how I did bend pipes for a Technopower radial. Do use fine 'dry' sand and get old of an apropriate bending tool. Fill the tube and put stops at both ends. And use a tube that is longer than needed so it can be handled well in the bender.In this case two bends have to be made and in view of the short distance this may be tricky, never done that myself.
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Old Mar 23, 2015, 01:44 PM
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xxxx
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Old Mar 23, 2015, 01:50 PM
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Also if you use the brass tubing like from K&S, you can heat it up good first to anneal it so it is softer and more easy to work with. You can use a gas stove or a torch, but you simply heat it until it is cherry red color. Then let it cool. We do the same thing with the brass fuel tubing too.
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Old Mar 23, 2015, 01:57 PM
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K and S sells a little set of bending springs, which do work quite well.
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Old Mar 23, 2015, 02:02 PM
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Quote:
Originally Posted by bogbeagle View Post
K and S sells a little set of bending springs, which do work quite well.
I had these years ago but could never work well with them, problem is how to retrieve the springs in fe a 90 bend ? I never managed that...
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Old Mar 23, 2015, 02:05 PM
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Yes I was just going to say that trying to get the spring off after putting in a nice bend was a problem for me too.
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