3 Piece piston dissassembly

**Cribbs74** Fri Jan 25, 2013 6:15 pm

Is it possible to do without destroying it and if so how?

Mudhen Fri Jan 25, 2013 6:24 pm

**Cribbs74** Fri Jan 25, 2013 6:27 pm

Mudhen wrote:I'm not saying it can't be done, I've just never had any success with this.
The circlip fits snugly into the piston barrel. There seems to be no way to grab it without it spinning in its groove.
Mud

Thanks Mud,

Well, I am hoping it can be as I just pulled a rod out by accident. DAMMIT!

**Cribbs74** Fri Jan 25, 2013 10:57 pm

It can be done,

Here is how I did it. Take a really stinkin small set of curved needle nose pliers and pop the collar where it splits up over the lip cast into the side of the piston. Then work your way around prying up a little at a time. It will come out easily. I then cleaned all the old junk out of the ball socket. Reassembly is the reverse. Snapping the collar back down can be a bit tricky start slow and work around till you hear the snap and then you know it's locked back in.

I ran it on prime afterwards and it stayed so I'm going to call it good. I am also glad Cox went with a pressed ball socket assy.

Ron

jjscott Sat Jan 26, 2013 7:45 am

If the big end of the rod is egged oval, is it possible to substitute a rod removed from a piston with the pressed in design? While a new piston/rod assembly could be used in an old engine, changing the rod only would sort of preserve originality.

Jim

**Cribbs74** Sat Jan 26, 2013 9:28 am

I am not sure if the rod big end is the same size. If it is then it's possible. It would be a lot of work and kind of risky.

The best bet would be to avoid the problem altogether. In my case it was unavoidable as I did everything correctly. I had let the engine soak, cleaned externally, applied heat, but didn't realize the cylinder had a burr. So when I went to rotate the crank I felt the bind and went to back off and that's when it seperated.

**Admin** Sat Jan 26, 2013 12:49 pm

http://www.ebay.com/itm/Cox-049-Engine-circa-1955-/111002886985?pt=US_Character_Radio_Control_Toys&hash=item19d849a349

Buy this, I would be surprised if there wasn't a 3 piece piston in it. 4 hours left, drop a $10 bid on it.

**Cribbs74** Sat Jan 26, 2013 1:29 pm

Dang, that is a good deal. I have a couple old bees that I haven't gone through yet. I wouldn't be surprised If I found one or two.

Somebody should buy that one. I thought the Babe Bee came out in '56?

Jason_WI Sat Jan 26, 2013 1:35 pm

It has the bright backplate so bets are it has a 3 piece piston.

**Admin** Sat Jan 26, 2013 2:47 pm

Looks like someone bought it.

Babe Bees did come out in 1956 which that one in the auction looks to be a 1956.

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3 Piece piston dissassembly

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