34 replies to this topic

[minilee94]

Is this primary gear okay iv been told its okay jut want to check as the bearing don't actully touch the crank as a 3 thou feeler gauge fits between the gear and the crank and once a film oil is round the bearing and crank it will protect it

Pics

[The Matt]

I don't even understand how that damage could happen.  I certainly wouldn't use it on my crank.

[minilee94]

I don't know either was a 2nd hand gear an that bit that's damaged don't touch te crank

[The Matt]

Well, I'd hope there's not much oil around there or it'll be getting through that 0.003" gap and onto your clutch.  It's a dry-running bush.

 

I'd replace it, the new fully-floating bush from Minispares is only about £20.  I'd fit that instead and be sure.

[The Matt]

http://www.minispare.../C-AEA3240.aspx

[minilee94]

Erm yeah I knew that lol :)

I forgot a seal sits on other side of that gear

Cheers are they a pain is the yaris to change

[minilee94]

I need a bush for an a+ and that hasn't got the big lip

[Artful Dodger]

Is it ok...



OHMYGOD

[minilee94]

I was only asking as I got told it was okay

[The Matt]

By the guy that sold it?

[minilee94]

Yes I won't mention who on here as he may well of not known it was as bad as this and he knows what he is on about and is well known

[The Matt]

He may also not know it was knackered to be honest.  This is the problem with Mini spares changing hands so often. It might even be something that he was sold and told it was OK too.

[minilee94]

Maybe but he would of know he is very good but oh we'll il get a new bush and that's that I just need to know about what speedo drive to fit been over a month now and I still dont know

[dklawson]

That's not OK, it should touch the crank, and sadly it's not a candidate for the floating bush.  The end you are showing is the flanged bushing.  The floating bush is just a "ring" and it goes in the other end of the gear.

 

There was a thread back in March which discussed how to size the primary gear bushings for the correct running clearance.  I cannot quote the figure from memory but the clearance is less than 0.003" and to be done right the machine shop that installs the replacement bush needs to bore it to match the diameter of your engine's crank.

 

Depending on the condition of the gear teeth and your budget that primary gear may be a candidate for reconditioning but I would not use it as it currently is.

[The Matt]

Aaaah, of course Doug.  The 'rear' bush and 'front' bush confused me.  This is the rear bush, I thought it was front!