[Shop-talk] How to open clearance on a hardened pin?

[Al Fuller]

Well, ok then... BTW, are the bearings and races not in the diagram you
referenced or am I missing something?

________________
Best Regards,
Al Fuller

On Sat, Mar 23, 2024, 11:23 PM Jim Franklin <jamesf at groupwbench.org> wrote:

> Good thought but I should have specified that I tried inserting the pin
> directly into the bearing race and it exhibited the same issue.
>
> jim
>
> On Mar 23, 2024, at 10:14 PM, Al Fuller <alfuller194 at gmail.com> wrote:
>
> Jim, I don't know this part/assembly but it seems to me that the original
> engineering would not have required hammering. Added to that one side goes
> in well but not the other, I'm wondering if the bike might have a little
> eccentricity in the fit-up? Is it possible that it was laid down at some
> point in the past and has a little twist in the assembly?
>
> ________________
> Best Regards,
> Al Fuller
>
> On Sat, Mar 23, 2024, 10:17 PM Jim Franklin <jamesf at groupwbench.org>
> wrote:
>
>> I'm assembling a Moto Guzzi swingarm which attaches to the back of the
>> gearbox. The gearbox has 2 recesses in which live plain roller bearings.
>> The swingarm has threaded holes through which locating pins screw. The tips
>> of the pins are unthreaded and locate into the ID of of the roller
>> bearings. Parts #12 here:
>>
>> https://harpermoto.com/collections/1980-1984-v-50-iii-500-swing-arm
>>
>> The pins are known for being stuck yet mine came out easily, probably
>> because the inner race was able to rest against the swingarm while the pin
>> was being pulled out. Assembly is another matter. The bearings don't bottom
>> out in their recess so the inner race has nothing supporting it when I
>> screw the pins into the swingarm, and one pin is not sliding into the inner
>> race (the other pin fits into both races as it should). I don't want to
>> hammer on it and dent the races. I've sanded it with some 400 grit but I'm
>> pretty sure the pins are hardened and so I haven't made any progress.
>>
>> Any thoughts on how to get this pin to fit in the bearing? Freezing it is
>> not a great option because of the time it takes to get things installed,
>> plus I'll need to do clearance adjustments.
>>
>> thanks,
>> jim
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