|
|
Post by headcoats on Mar 20, 2021 16:05:46 GMT 1
Bought a scabby YPVS rear master cylinder off fleabay
I's in not great condition but the plunger was seized in the bore (not mentioned in description), so filled it up with WD40 and gave it a tap to move it down and clean the area and hope the spring made it pop out again
That didn't work LOL
So how can I get it out ? |
|
|
|
Post by chrisg on Mar 20, 2021 16:10:25 GMT 1
Can you drill/tap and use a puller?
I had an issue on a front M/S and ground a step in some old pliers to pull out.
|
|
|
|
Post by headcoats on Mar 20, 2021 16:16:31 GMT 1
I have left it soaking at the moment
|
|
|
|
Post by headcoats on Mar 20, 2021 22:06:22 GMT 1
Still stuck !
|
|
|
|
Post by midlifecrisisrd on Mar 20, 2021 22:29:11 GMT 1
As said, drill and tap the plunger to pull it out
Steve
|
|
|
|
Post by JonW on Mar 21, 2021 1:41:08 GMT 1
DeoxC
Just done one that wouldnt shift and that got it. Its usually the spring that has rusted and bound up.
|
|
|
|
Post by headcoats on Mar 21, 2021 10:05:30 GMT 1
Got some WD40 and white vinegar spray the Missus uses for cleaning !
|
|
|
|
Post by brigitte on Mar 21, 2021 15:46:18 GMT 1
Connect it with a brake hose to a working M.C.. Then you can push it out. Then you can see, that the cylinder bore is corroded beyond repair. How I know?
Brigitte
|
|
|
|
Post by headcoats on Mar 21, 2021 17:31:29 GMT 1
Yes got a feeling this one will be fecked if i get it out
Contacted the seller !
|
|
|
|
Post by rich on Mar 21, 2021 18:06:19 GMT 1
Remove the rubber boot, circlip, retaining washer and pushrod so you are faced with the cup end of the plunger. Loads of WD40, push the plunger inwards as far as you can with a Philips screwdriver. Hold the cylinder in your hand (like a grip) and slam the open end down onto a wooden surface really hard. Push the piston back in and keep repeating this until it comes out.
|
|
|
|
Post by headcoats on Mar 21, 2021 18:37:16 GMT 1
Tried that and it didn't work
It is stuck down inside the body ooh er
|
|
|
|
Post by buck1963 on Mar 21, 2021 20:29:35 GMT 1
try some IPA and gearbox oil mixed together,let it soak for a bit,never failed me yet!,
|
|
|
|
Post by midlifecrisisrd on Mar 21, 2021 20:54:37 GMT 1
You can use a grease gun like you do with calipers
Steve
|
|
|
|
Post by steeley on Mar 21, 2021 20:58:34 GMT 1
Yes got a feeling this one will be fecked if i get it out Contacted the seller ! Hi , there is a chap advertising in one of the bike mags says he can reclaim them by machining them and fitting a sleeve . |
|
|
|
Post by chrisg on Mar 21, 2021 23:01:39 GMT 1
You can use a grease gun like you do with calipers Steve I thought of that, but when the piston moves past the small holes ,all pressure will be lost, but at least it moves from the bottom of the cylinder. |
|
|
|
Post by steve h on Mar 21, 2021 23:12:17 GMT 1
Yes got a feeling this one will be fecked if i get it out Contacted the seller ! Hi , there is a chap advertising in one of the bike mags says he can reclaim them by machining them and fitting a sleeve . Thats good news, that will save many oem ones, I've one that's been attacked by some eegit with a sharp driver and left deep scratches in the cylinder, and one thats just worn out. |
|
|
|
Post by midlifecrisisrd on Mar 22, 2021 10:08:07 GMT 1
You can use a grease gun like you do with calipers Steve I thought of that, but when the piston moves past the small holes ,all pressure will be lost, but at least it moves from the bottom of the cylinder. Very true unless you leave the plastic elbow on and blank it with a bit of pipe 😁 Personally I'd bin it and just buy an r6/r1 Brembo Steve |
|
|
|
Post by headcoats on Mar 22, 2021 10:31:20 GMT 1
I did buy a Brembo one aswell but I have a genuine Yamaha master cylinder rebuild kit to use LOL
Looks like I will have to drill it but ain't got a slide hammer only pound shop tools |
|
|
|
Post by midlifecrisisrd on Mar 22, 2021 12:28:31 GMT 1
The Brembo one should still be 1/2 inch so the gen Yam kit should go in it
You need the ypvs fittings anyway to make the rod long enough
Steve
|
|
|
|
Post by headcoats on Mar 26, 2021 8:32:55 GMT 1
I did drill it and put an M6 tap in and as i was twisting it in to get a good purchase , the force made the plunger turn then the spring made it pop out
|
|
|
|
Post by chrisg on Mar 26, 2021 14:29:02 GMT 1
I did drill it and put an M6 tap in and as i was twisting it in to get a good purchase , the force made the plunger turn then the spring made it pop out Result. 😀 |
|
