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kettlewj
The 65mph Club Member
kettlewj
The 65mph Club Member
Joined: September 28th, 2006, 7:06 pm

July 8th, 2007, 9:37 pm #11

Soak it in plus gas, and blast it out at the gas station, if the piston is badly corroded, put it in the lathe, and clean it up with some wet and dry, also, the piston will shoot out at about 200mph, make sure that your fingers are out the way.
Will
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Drumbrake
Fizzmeister Extrodinaire
Drumbrake
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Joined: February 5th, 2005, 5:57 pm

July 8th, 2007, 9:41 pm #12

kettlewj wrote: if the piston is badly corroded, put it in the lathe, and clean it up with some wet and dry,
If the piston is badly corroded, you BIN it and grit your teeth to by a new one. Wet and drying it will seriously screw it up and give you sealing problems
The oldun's are the best'uns.........usually
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Fisambard
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Fisambard
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Joined: August 31st, 2007, 8:26 pm

February 21st, 2010, 3:03 pm #13

Having soaked (my caliper) the whole thing in paraffin & WD40 and blasted with the airline it still would not budge. Left for a few hours -still no good. Got gas bottle out, warmed the caliper up for a minute, placed face down, so piston would not fly out, gave it another blast with air gun and it 'popped' nicely out onto the bench.
Fisambard
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mech73
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mech73
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Joined: May 19th, 2007, 8:43 pm

February 21st, 2010, 4:40 pm #14

Fisambard wrote:Having soaked (my caliper) the whole thing in paraffin & WD40 and blasted with the airline it still would not budge. Left for a few hours -still no good. Got gas bottle out, warmed the caliper up for a minute, placed face down, so piston would not fly out, gave it another blast with air gun and it 'popped' nicely out onto the bench.
Thats similar to my experience, I soaked in diesel then applied heat with a hot air gun. Not having an airline, I used an old pair of pliers to grip the inside of the piston by forcing the handles out with a nut and bolt. A few twists and out it came.

There is a proper tool available for gripping the inside of the piston rather than bodging with pliers. I think Kwackers might sell them on ebay.
Lincolnshire exile in North Hampshire

Brighton 08/09/10/11/12
East Coast 10/12
IOW 08/09/10/11
Northern 12
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New Forest 09/10/11/12
Billing 07/08/09/10
Eagle 08/09/10/11
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techno6fs1e
The 65mph Club Member
techno6fs1e
The 65mph Club Member
Joined: July 21st, 2005, 3:02 am

September 14th, 2011, 10:46 pm #15

Is there a tool for pulling the two pins out using the 5mm threads ,cant move mine they are solid
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Fisambard
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Fisambard
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Joined: August 31st, 2007, 8:26 pm

September 15th, 2011, 10:53 am #16

Hello Jim
I have removed the pins by winding in a bolt as far as possible then clamping the bolt in a the vice and carefully trying to turn bolt by holding the caliper. Use a strong grade bolt or it might snap. Prior to this give the whole assembly a good soaking in diesel / paraffin. I have repaired three calipers like this now, and everyone is a trial.
Fisambard
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mech73
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mech73
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Joined: May 19th, 2007, 8:43 pm

September 15th, 2011, 5:22 pm #17

If you can get some screwed rod of the right thread, a piece of metal tube, a thick washer and a nut, you should be able to make a puller to draw the pins out. Heat from a hot air gun and soaking as Wayne suggested will also help.

Cheers

Mark C

PS I can't remember exactly, but there may be some rubber bushes that these pins go through in the bracket that bolts to the fork leg, so make sure you can replace these with new before applying too much heat.
Lincolnshire exile in North Hampshire

Brighton 08/09/10/11/12
East Coast 10/12
IOW 08/09/10/11
Northern 12
Uttoxeter 08/09/10
Spa Francorchamps 11
New Forest 09/10/11/12
Billing 07/08/09/10
Eagle 08/09/10/11
Ace Cafe 09/10/11


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