Lower bevel bearing puller

[graeme]

Removing the bearing carrier for the lower bevel.
From past threads Hans made a slide carrier puller.
If you are about Hans, what was the external size of the material you threaded please.

37mm or as you used 36.5mm

Regards
Graeme

[Bevel bob]

I found that with care it could be tapped up from below.And then levered out.

[ducwiz]

The thread was indeed 36.5mm dia., pitch 1mm. I made the slide extractor because I could not tap the bearing sleeve out, didn't move a mm.

Hans

[graeme]

Thank you Bob but this one is in tight and some spare time for some lathe work won’t hurt.

Thank you Hans, I hope you don’t mind if I steal your design.

Regards
Graeme

[ducwiz]

Greame,

I hereby declare: you and all other forum members may steal my design by making their tools
Btw, I made 2 further ones back then, i. e. extractors for the rocker shafts.

Hans

[graeme]

Thank you Hans,
I have already made rocker shaft extractors

Graeme

[LaceyDucati]

Graeme

I made a puller years ago (maybe more than 25 years!) and the thread on mine appears about 36.8, I just made it to suit the housing I had at the time. It does spin easily into most housings I have just tried it in. At the time I just assumed it was just an undersize 37mm thread in the housing I needed it for. I've used it for many extractions and It's always fitted. I did find one housing today that it was reluctant to start in, but that was an exception. That said I guess even at 36.5mm it would probably still work fine.

My guess is it is supposed to be 37mm and like many ducati threads it falls short of normal tolerancing. A little like the original M48 exhaust nuts that regularly measure 47.6mm or smaller and the M20 x 1 crank threads on the early W/C cranks that measure 19.5mm........ Nowadays where I'm involved in parts manufacture I have many plug and ring gauges to check threads and it's now clear Ducati either didn't have them or use them. Or more truthfully possibly in the 70's inspection was forgone for producing units in a cash strapped factory.

Anyway see picture of the slide hammer extractor I knocked up, the overall length is 35mm and the counterbore is 16mm diameter 27mm deep (not seen in the pic). The thread in the top is M10 to suit my slide hammer. This one wasn't the prettiest thing knocked up quickly out of a bit of mild steel (EN3B), but it does the job.

IMG_0308.JPG

Regards Nigel

[ducwiz]

Nigel,

just found the old photo of mine. It is certainly uglier than yours

8bq-1-745d.jpg

I made it from parts pulled from the scrap box. I remember having brazed together 2 steel pieces, as no steel rod with an appropriate length was in the box ...

Hans

[LaceyDucati]

Hans
Like all the best homemade special tools! Once they work, that good intention to make a "proper" version ....one day, never happens

A good scrap bin is always a satisfying source of materials.

My original valve spring compressor made from an old G Clamp and a bent piece of black steel is still in use 30 years later. About five years after I made it I was given a genuine factory tool. I just didn't like it so I sold it!

Regards Nigel

[graeme]

Thank you both for your time replying to my questions, much appreciated

Regards
Graeme