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Phil 850
 Post subject: Final drive fitment
PostPosted: Sat Jul 25, 2015 1:53 pm 
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Will this http://m.minispares.com/classic~mini~shop/CWP2-9 fit my rod change gearbox 22G1832.

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drmini in aust
 Post subject: Re: Final drive fitment
PostPosted: Sat Jul 25, 2015 3:45 pm 
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Yes.
You may need to bore or grind your pinion bearing retainer's diameter a little bigger to clear the 20T pinion.

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Phil 850
 Post subject: Re: Final drive fitment
PostPosted: Sat Jul 25, 2015 5:36 pm 
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I presume your talking about the third motion shaft bearing retainer as per the image below.
Image
I can see where it may be a close fit with a larger pinion.
I presume this retainer has a large section cut away where the crown wheel meshes with the pinion.

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drmini in aust
 Post subject: Re: Final drive fitment
PostPosted: Sat Jul 25, 2015 7:21 pm 
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Yes that is it.
As long as the retainer's bore clears the pinion's teeth by 1mm or so it is fine. If not, bore it until it does.
If you have access to a lathe it is a 5 minute job.
4 synchro remote and earlier retainers need a bit more metal taken out to achieve this.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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Phil 850
 Post subject: Re: Final drive fitment
PostPosted: Sat Jul 25, 2015 8:46 pm 
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Thanks Kev
I know someone with a lathe :wink:

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simon k
 Post subject: Re: Final drive fitment
PostPosted: Sat Jul 25, 2015 8:56 pm 
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it's soft metal... I did mine with a file

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1071 S
 Post subject: Re: Final drive fitment
PostPosted: Sun Jul 26, 2015 9:39 am 
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Yep - you can probably do it with a round file in less time than it would take to set up the lathe...

Cheers, Ian
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Phil 850
 Post subject: Re: Final drive fitment
PostPosted: Sun Jul 26, 2015 12:12 pm 
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simon k wrote:
it's soft metal... I did mine with a file

Surely it would be better being machined. With a filed finish and the close proximity of the pinion, the oil on the pinion would be sheared as it passes the "rough" surface of the bearing retainer and robbing valuable power :cry:

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drmini in aust
 Post subject: Re: Final drive fitment
PostPosted: Sun Jul 26, 2015 1:26 pm 
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It will grab fine and true in the lathe's 3 jaw chuck. 5 secs setup time. :)

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simon k
 Post subject: Re: Final drive fitment
PostPosted: Sun Jul 26, 2015 3:00 pm 
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Phil 850 wrote:
simon k wrote:
it's soft metal... I did mine with a file

Surely it would be better being machined. With a filed finish and the close proximity of the pinion, the oil on the pinion would be sheared as it passes the "rough" surface of the bearing retainer and robbing valuable power :cry:


yeah, maybe...... though if you use a few different roughness files you can get a very nice smooth surface, and you can also give it a fair and even amount of clearance as mine wasn't all that central to start with....

and any file finish lot better than the rough cast finish it started out with :wink:

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