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500 Tappet cover head size

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davidcumbria:

--- Quote from: Laverdaroo on October 07, 2023, 07:15:30 PM ---I got a new pitch gauge with some taps I bought and use that. Quick check, match the file size up,sounds like you have the same one as me, and away you go. It’s amazing what you can recover with them, threads that you thought were proper knackered can be nannied up rather well when used with a bit of patience


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The steering stem thread ( m24 x1) was damaged during powder coating and to my horror got badly cross threaded when i tightened the stem nut. First time in years - fear and self loathing ! I was looking at a world of pain, cost and inconvenience but on the basis of this thread  bought one of these square files and spent half an hour getting it back in shape. Nut now spins easily with finger pressure only. A narrow escape and a new technique learned. One of the great satisfactions of spending our time doing this and benefiting from the great advice on here👍

Laverdaroo:
Well done, terribly satisfying isn’t it?



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McCabe-Thiele (Ted):
Great recovery story Dave.
I had a similar issue when trying to fit the bearing retainer on my 400 wheels rebuilt by CWC. Local engineering firm made a tap to clean out the thread inside the hub.(damaged when CWC removed the bearings - CWC were not interested)

They gave me the tap - came in handy on my 500 front hub after drilling out the four stake marks to clean out the thread.

DomP:
How can the threads be cleaned up on on larger internal thread, namely the rear hub thread?

McCabe-Thiele (Ted):

--- Quote from: DomP on October 13, 2023, 05:49:00 PM ---How can the threads be cleaned up on on larger internal thread, namely the rear hub thread?

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Not sure but most probably when you remove the old retaining (left hand thread) it's difficult to remove all the distortion caused when the factory do the four stake points. I have found that a new retaining ring does not want to go in easily beyond half a turn by hand as the Hub threads look flattened so as to speak.

On my rear hub I used a small round file on the inside of the first couple of threads to file out the visible distortion at the stake points. I then used the old retaining ring that I had cleaned thoroughly with a wire brush as a tap (I did not have the nerve to cut across the thread with a hack saw in four places) the old ring went in a good couple of complete turns by hand - I basically tightened it up and took it out a few times - cleaning the thread on the retaining ring as well as WD 40 on the Hub. I then tried my new retaining ring & it went in a couple of turns by hand so I was happy it would tighten up when I fit the bearings etc.

I have not as yet fitted the wheel bearings as CWC rebuild wheels without them in place.

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