Rear Mstr Cylinder; Beyond repair?


Information and questions on GL1100 Goldwings (1980-1983)
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lowmanj
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Location: Merritt Island, FL
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Rear Mstr Cylinder; Beyond repair?

Postby lowmanj » Tue Jan 18, 2011 8:21 pm



Rear master cylinder has damage where rubber boot attaches. Snap ring groove, and cylinder itself are OK. Also, this damage was always present, even all the years I had it on the road.
I'm inclined to rebuild it as is.
Do you see any safety issues?
Thanks
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WingAdmin
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Re: Rear Mstr Cylinder; Beyond repair?

Postby WingAdmin » Tue Jan 18, 2011 10:03 pm

There's no mechanical requirement for that lip to be there, it's strictly to ensure a seal against the rubber boot, to try to keep grit and dirt out of the cylinder top.

You might want to try and clean it up, then re-form the missing area with JB-Weld (mix some up, let it cure until it gets quite stiff, then form it into place). Once it's cured, reassemble the cylinder.

Or, you could do as you are considering, clean it up, pop the boot on there, and go riding. :) It's not going to present a safety issue, although you might want to be a little more attentive when it comes to keeping it clean.

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thrasherg
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Re: Rear Mstr Cylinder; Beyond repair?

Postby thrasherg » Wed Jan 19, 2011 10:42 am

You could also clean the piece with a degreaser and then put a little bit of super glue and apply the rubber boot. That way the boat will be stuck on tight preventing any dirt from getting in there and just means that if you ever had to open it up again in the future you would have to cut the boot off (They are not very expensive) but it means the insides of the cylinder would stay nice and clean), Or if you have the patience do as Wing admin suggest, or if you are like me, just put it together as it is and ride. I can't see it doing much harm! If you ride in the winter when they have salted the roads you will need to keep an eye that there is no corrosion forming inside the master cylinder, but if like me you live in Texas, we never see snow so there is no risk of corrosion!! :)

Gary

lowmanj
Posts: 52
Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
Motorcycle: 1981 GL 1100 Interstate

Re: Rear Mstr Cylinder; Beyond repair?

Postby lowmanj » Wed Jan 19, 2011 10:42 pm

Thanks for all the input. Does anyone know if a new rubber boot is included in rebuild kits?
At any rate, the one on hand is still in one piece. JB weld is some good stuff. I think the glue or maybe a sturdy zip tie will give enough protection.

The inside bore of cylinder cleaned up nicely. I broke into my gun cleaning box this time. A bore brush and some flitz polish made quick work of it.
Thanks all.

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WingAdmin
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Re: Rear Mstr Cylinder; Beyond repair?

Postby WingAdmin » Thu Jan 20, 2011 9:28 pm

Oooh...bore cleaning brush would work, but remember the inside of that cylinder is aluminum - MUCH softer than the inside of a gun barrel, and easy to scratch up. You want to be very gentle. Maybe like a small mop for a .410 or something would be good.

The rebuild kits typically come with new boots.

lowmanj
Posts: 52
Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
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Re: Rear Mstr Cylinder; Beyond repair?

Postby lowmanj » Mon Jan 24, 2011 6:58 pm

Thanks. You're right about taking it easy. I used a brass bore brush to be sure. There was enough clearance to fit a couple cloth patches between the brush and the cylinder. That, with the metal polish looks right nice, with no visible scratches.




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