|
Author |
Message |
petermeachem
Joined: 23 Sep 2013 Posts: 358 Location: Chichester Sussex
|
Posted: Fri Jan 10, 2014 10:02 pm Post subject: Dismantling Su carbs |
|
|
I've a couple of MC2 Su's which I've had for years and want to sell. I want to make them prettier first. They don't look bad but I just can't take them to bits. The suction chamber is held on by one screw on a lug (screw removed) and what looks like a dowel pin on a lug diametrically opposite. I can't get the chamber off. I've been dosing it in plus gas for days and it won't shift at all. Any ideas? |
|
Back to top |
|
|
47Jag
Joined: 26 Jun 2008 Posts: 1480 Location: Bothwell, Scotland
|
Posted: Fri Jan 10, 2014 11:07 pm Post subject: |
|
|
Peter,
Could you pry between the piston and the carb 'floor' with something to lift piston and chamber?
Art |
|
Back to top |
|
|
petermeachem
Joined: 23 Sep 2013 Posts: 358 Location: Chichester Sussex
|
Posted: Sat Jan 11, 2014 8:29 am Post subject: |
|
|
I'm wary of putting any force on the body. I was wondering if I took the jet off if I could use a drift through the jet and onto the piston, not sure how much room there would be |
|
Back to top |
|
|
ka
Joined: 03 Dec 2007 Posts: 600 Location: Orkney.
|
Posted: Sat Jan 11, 2014 8:43 am Post subject: |
|
|
I stand to be corrected, but believe the top body is held down with two screws, therefore the 'dowl' side could be a sheared off screw, that is why the body is not parting with reasonable force.
Try drilling it out of the top body, then soak with penetrating fluid, and we should have Robert, your fathers brother knocking at the door. _________________ KA
Better three than four. |
|
Back to top |
|
|
petermeachem
Joined: 23 Sep 2013 Posts: 358 Location: Chichester Sussex
|
Posted: Sat Jan 11, 2014 1:27 pm Post subject: |
|
|
ka, you are right. Why didn't I check with the other half of the pair I have in a box in a garage instead of assuming it was a pin?
It's not going to be easy to get out, the chamber is in the way of a drill chuck. I might be able to get to it with my modelling drill (cheap dremel) |
|
Back to top |
|
|
petermeachem
Joined: 23 Sep 2013 Posts: 358 Location: Chichester Sussex
|
Posted: Sun Jan 12, 2014 10:04 am Post subject: |
|
|
Thinking about this the hole in the lug on the suction chamber isn't threaded is it? So I shouldn't have to attempt to drill it out. I'll continue with other methods |
|
Back to top |
|
|
Bitumen Boy
Joined: 26 Jan 2012 Posts: 1735 Location: Above the snow line in old Monmouthshire
|
Posted: Sun Jan 12, 2014 11:37 am Post subject: |
|
|
How about some hot water on the suction chamber? Might just expand it enough to get some movement. I'm not familiar with these early SUs, but I'm guessing they're a similar alloy to more recent types? |
|
Back to top |
|
|
Roger-hatchy
Joined: 07 Dec 2007 Posts: 2135 Location: Tiptree, Essex
|
Posted: Thu Jan 16, 2014 5:19 pm Post subject: |
|
|
The SU MC (motor cycle) 2 carb has two screws holding the vacuum chamber to the main body,
it will rotate once you have the screws removed,
it will fit either way round,
it is not threaded to the body and the vacuum chamber screw holes
are not threaded, it is threaded in the main body.
The piston has a keyway to line it up in the main body.
With the carb of it might be possible to get at the screw from below.
I have an exploded diagram of the MC2 some where
I'll post it as soon as I find it.
And some photos
The DLM has two MC2's fitted and I have lost count of the times
I have stripped and rebuilt them.
Roger |
|
Back to top |
|
|
petermeachem
Joined: 23 Sep 2013 Posts: 358 Location: Chichester Sussex
|
Posted: Thu Jan 16, 2014 5:23 pm Post subject: |
|
|
One screw has sheared and they are properly stuck. I give it a squirt of penetrating every time I go past. Next I'll pour boiling water over it.
I've taken loads of old su's apart, never had a problem before |
|
Back to top |
|
|
ka
Joined: 03 Dec 2007 Posts: 600 Location: Orkney.
|
Posted: Thu Jan 16, 2014 7:21 pm Post subject: SU carb on a Motor Cycle. |
|
|
I know that the Mk1V Commando, that was never made, was to have an 11/2" SU on it, as I have the same carb, and a manifold from the Norton Casting on my Mk11a.
But I am intrequed, what motor cycle was produced with an SU Carb? _________________ KA
Better three than four. |
|
Back to top |
|
|
petermeachem
Joined: 23 Sep 2013 Posts: 358 Location: Chichester Sussex
|
|
Back to top |
|
|
Rosco663
Joined: 17 Dec 2012 Posts: 257 Location: South Australia
|
Posted: Wed Jan 29, 2014 6:37 am Post subject: |
|
|
I have had success boiling small items, such as carbies, in a saucepan full of water with a small quantity of Sugarsoap added. Seemed to break down some of the corrosion quite quickly and also has the benefit of applying heat which is always a good idea for stuck parts. .
After simmering for about 20 minutes remove the parts, give them a quick rinse then air dry then hit it with a squirt of 50/50 Acetone/Automatic Transmission Fluid or any other good penetrating fluid. Then attempt to get some movement between the parts.
Don't be tempted to soak in this solution for extended periods as porous materials can absorb this liquid and adverse chemical reactions can occur.
I did this exercise in the shed on a camp stove - don't tell the missus about the saucepan _________________ Rosco |
|
Back to top |
|
|
petermeachem
Joined: 23 Sep 2013 Posts: 358 Location: Chichester Sussex
|
Posted: Wed Jan 29, 2014 7:31 am Post subject: |
|
|
Plenty of things to try. I've been a bit busy getting rid of things and selling bits as the house is sold so the carbs have just sat there. Must get back to them soon. Sugarsoap is excellent stuff for degreasing. I washed the kitchen down with it once and all the skin fell off my right hand, will wear marigolds next time |
|
Back to top |
|
|
|