Tom, you sold me a used prop hub for my new-to-me TOC 53, I just got it in the mail Monday. Over the weekend after we spoke I went out and found some actual 5MM X 0.8 X 50MM bolts, and using these instead of the 10/32's that it came with from the previous owner, the bolts hold as tight as I can crank on them with a allen head screwdriver.

However, one of the bolt holes is still visibly worn and the hub you sent me is in much better shape.

What is the best method for removing the prop hub retaining bolt and hub? Is it a standard or reverse thread? What method would you suggest to hold the engine from turning over while I'm trying to loosen the bolt? I have a bolt with the same thread as the spark plug hole I could use to stop the piston, and though I've used that method on smaller engines I'm not sure if it's safe for a 53cc, I'm guessing much more force will be necessary and I'm afraid it will damage the piston or plug threads. And finally, is the hub pressed on to the crank or should it come off realtively easily once the retaining bolt is removed?

Thanks in advance!

ps - put 6 flights on the sukhoi I got used that I told you about, it's the best flying plane I can ever remember flying.

I made a lever that bolts to the front of the hub to hold it and it has a hole in the center so I can put a socket wrench over the center bolt to loosen it. It's a standard left hand thread. I don't recommenc holding it with the bolt in the plug hole, I don't know what that might do internally.

The hub is pressed on and you will need a puller. I use a prop drill jig assembled with the nub pointing into the crankshaft and tighten the 5mm screws into the hub. IF you don't have a drill jig you'll need to make something.

TF

That was fast....

OK, you gave me an idea, I have some 2" X 1/8" aluminum, I'll just drill it for the six bolt holes with room in the center for a socket and use it like as a lever like you said.... I didn't think the bolt in the plug hole was ever a good idea.... I was afriad it would at best mar the top of the piston and at worst bend the rod or hose the bearings. Works well on small nitro engines though!

I have a bunch of pullers, I'm sure that something I have will work to pull it off.

Thanks again!

Steve

Regarding the 3MM TOC 53 engine, does anyone know who has parts for them now? Looking for the prop hub. A couple of the bolt holes are stripped on mine. Maybe I should try the 5mm bolts. Still using the ones that came with it.

Thanks...ddp

Cermark Sells the toc-53. They have parts....