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Author Topic: Cb360 fork rebuild problems.  (Read 243 times)

Offline ryan_289

  • Posts: 36
Cb360 fork rebuild problems.
« on: Jul 28, 2018, 00:00:29 »
I'm in the middle of rebuilding my front forks.  I cant get the Allen bolt at the bottom of the tube to break loose.  I've watched the common motor videos and I've tried to hammer a socket wrapped in tape into the other end but I cant get a bite.  Any other suggestions?

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Offline irk miller

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Re: Cb360 fork rebuild problems.
« Reply #1 on: Jul 28, 2018, 01:26:21 »
It's been so long, but if I remember right, I pounded a tapered broom handle in from the top and put it into a vice by the handle, then pounded the screw out with a manual impact driver and a 3lb sledge like one of these...


Offline Sderbyshire

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Re: Cb360 fork rebuild problems.
« Reply #2 on: Jul 28, 2018, 04:59:09 »
I used an electric impact wrench, guess its the impact thats critical?

Steve

Offline irk miller

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Re: Cb360 fork rebuild problems.
« Reply #3 on: Jul 28, 2018, 10:32:32 »
I have significantly better luck with the manual ones, honestly.  But, is your issue that it won't break loose or that it's spinning free?

Offline ryan_289

  • Posts: 36
Re: Cb360 fork rebuild problems.
« Reply #4 on: Jul 28, 2018, 13:27:42 »
I have significantly better luck with the manual ones, honestly.  But, is your issue that it won't break loose or that it's spinning free?

Its spinning free.

Offline irk miller

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Re: Cb360 fork rebuild problems.
« Reply #5 on: Jul 28, 2018, 15:48:26 »
Its spinning free.

In that case, you need to improve your tool going in through the top of fork tube.  This damper rod is what your dealing with...



The tapered end is where the screw is you're trying to remove.  The flanged end has a hole.  You're trying to get something that's tapered tight enough in that hole that it will hold enough to break the screw loose.  I've used threaded rod with a shock bushing sandwiched between two bolts and two washers about 2 inches above the end of the rod.  You want the OD of the shock bushing the same as the ID of the fork tube.  this keeps the threaded rod centered inside the tube.  The threaded rod is tapered at that end like a really long nail.  I pound the threaded rod hard into the tube so that jams into that damper rod really well and holds tight.

Offline ryan_289

  • Posts: 36
Re: Cb360 fork rebuild problems.
« Reply #6 on: Jul 29, 2018, 13:43:07 »
Hammer impact did the trick on both.  Another question.
It appears someone swapped a fork tube at some point.  One is slightly different than the other.  The older one has some slight pitting that didn't polish off with a scotch brite pad.  Will this destroy my new fork seal?

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Offline crazypj

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Re: Cb360 fork rebuild problems.
« Reply #7 on: Jul 29, 2018, 22:04:44 »
Yep. You could try spraying down the pitted area, sweating' out any oil, use two part epoxy to fill in pits then cut/scrape/polish back to smooth.  You may also get lucky if there is anywhere 'local' that repairs hydraulic cylinders, often they can replate rod and grind to size.  Does anyone know if 'Forking By Frank' is still in business? I had heard they closed down 3~4 yrs ago
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0