Scooterotica

Went to put a crank bearing collar on a crank and it went on too easy, as easy as it can be pulled off without any bother.

There's no play in the collar on the crank, but I take it this is no good?

Just read about this in an old tuning book says you can loctight it on.

yep, as dennis says, loctite. the function of the collar is to wear, ie its a sacrificial part to protect the crank. same function as the clutch needle rollers or brass collar a la gp version.

Cheers.

Mmmmmmm......not ideal I would say.....does not sound like a good interference fit to me.
I wouldn't use it as when I used to fit bearings for a living we would call that shaft fooked!
A "bodge" would be to centre punch either side of a shaft and use medium to high strength bearing fit Loctite, however, do not centre punch your crank! Lol!
If you are going to fit it and cross your fingers use the correct spec Loctite.
Bear in mind that under load, high heat and running at 6000rpm and above, if that Loctite becomes weak the collar will start spinning on the shaft causing more heat and eventually warping or cracking the shaft leading to more damage. The crank spins at far more revs than the clutch housing and also the bush in the clutch housing is made of a bronze material for a reason (spider and bell housing made of a harder material so it wears the bronze bush only) so I do not think that is a fair comparison.
Not saying anyone is wrong here, just my opinion. I would not put that in my engine.

Loctite is supposed to be used as an extra fail safe for bearing fit.....not the only thing holding the bearing race on though!

I had this before on an old crank that the collar had spun on (my fault - heated the previous collar with flame before fitting). The next collar worked its way up the crank and eventually took out the flywheel seal. This was on a grasstrack race motor. The solution which worked - for the track - was to centre-punch the shaft and Loctite but I never really trusted it for the road. Either your bearing is oversize (3% chance - try another) or your shaft is worn (97% chance).

I think those collars are supposed to be stretched a little by the interference fit to give the correct clearance on the bearing, but you won't get that with Loctite. Without that 'stretch' I don't think it looks good for the long-term reliability prospects.

How lucky do you feel, punk?

Thank you. Crank removed! New doorstop now in use.