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46FX rear bearing won't come out

Old 06-06-2006, 02:46 AM
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Default 46FX rear bearing won't come out

I have everything off/out of the engine block except the rear bearing, and heating it in the oven doesn't help. Since the the bearing's inner race surface is the same size and flush with the crankshaft passage in the block, there appears to be no way to help work the bearing out by pushing on it. I've tried heating the block and rapping the back of it against a soft piece of wood to try to dislodge the bearing, but it ain't budging. I'm surpised at this since the engine is barely broke in with 4 8oz tanks run through it ( this engine was bought 12 years ago and stored until I recently got back to the hobby. It's extremely clean inside ). The only thing I can think of is the Marvel air tool oil I put in it when I stored it has solidified and has the bearing "glued" in. As to why I'm pulling the bearing, I have ceramics from RC bearing I want to put in to it.

Any suggestions are appreciated.


Old 06-06-2006, 03:38 AM
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Default RE: 46FX rear bearing won't come out

G'day Mate,
Heat it to 300F in the oven for about 15mins, & try again, it must be hot while you are hitting a wooden block with the back of the engine, you must hit the block with the engine crankcase flat on it, it will be gum or varnish that is holding the bearing in place, was it run with Castor oil in the fuel.
Good Flyin Mate,
Old 06-06-2006, 09:37 AM
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Default RE: 46FX rear bearing won't come out

Had the same problem a few years ago when I bought the engine from someone else that did the samething. I soaked it for 3 days in lacqure thinner then got a little aggresive on the pounding but did come out with no problems.

Old 06-09-2006, 12:38 PM
Mike Ledbetter
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Default RE: 46FX rear bearing won't come out

Use Birchwood Casey Sheath (a gun cleaning product) or Kano Kroil penetrating oil to loosen gum and deposits.
Old 06-12-2006, 02:48 PM
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Default RE: 46FX rear bearing won't come out

You may have to heat the engine a bit more. We've never had a problem getting bearings out. 300 degrees F isn't too much.

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