Flywheel collet?

[olds97_lss]

Does anyone know the correct way to get the collet on the crank to bind really well and not come loose?

I have the O.S. 21 RG-X(P) on my maxx. I've never had a problem keeping the flywheel tight until now with this engine. I've had to resort to putting steel shim washers on the crank behind the collet to get it to hook up properly. This combined with really wrenching down on the flywheel nut.

 

[scottm]

Usually you need a small spacer, about 1/8" wide, behind the tapered collet. Do you have that?

 

[olds97_lss]

I used steel shim .5mm washers.

On my original engines that came on the maxx and the xxx-nt, there wasn't anything behind the flywheel. It's hard to explain, but i used to use a set of forceps and crank down the flywheel nut. Then i would take out the forceps. I've since broken the forceps and havn't replaced them, so i had to resort to putting something behind the flywheel permenently.

 

[scottm]

You need enough spacer so the nut tightens down on the collet, rather than bottoming out on the threads. Do you mean you can't tighten it because it spins? If so, you can take out the plug and snake some string into the cylinder, so the piston comes up against the string, allowing you to torque the nut.

 

[olds97_lss]

No, i understand how it works. I was just curious to see if there's more than one right way. Since my original trucks engines came without anything behind the flywheel, i'm not 100% sure it's ok to shim it out the way i did. I'm afraid it's hard on the engines main bearing.

I have it tight and working, just checking to see what others have done and what might also work for this.

In my opinion, it's kind of a crappy design. I've worked on other engines (car, motorcycle, lots of lawnmowers) and there's always either a key, a spline or a pin of sorts, that something of this nature would use for bite. Not just pressure off a cone shapped collet.

Like i've said, i've rebuilt a few car engines and motorcycle engines on my own . I worked in a small engine shop for 2 years while going to college. I've been around all sorts of machinery and never have i seen a design like this on something that is entirely dependent on a pressure fitting.

Just seems kind of hokey.

 

[scottm]

I know what you mean, but all those other engines have keys and stuff to set location because the flywheels are part of the ignition system. There is no problem if a glow engine flywheel slips.

The spacer needs to be a small diameter so it pushes against the inner race of the front bearing. RC Solutions provides a spacer with the Cybermaxx kit, and you can buy it separately.

 

[olds97_lss]

Yeah, i know why other engines have them and why small RC doesn't necesarrily need them, but it would be nice nonetheless.

Thanks for the recommendation. I'll check into it.