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#1 Indy Orange

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Posted 11 December 2020 - 07:23 PM

Hi all,I managed to find a spare Big Nut master cylinder , but it isn’t in good shape by the looks , the nut won’t budge .Is there any recommendations on soaking it in something to loosen everything up? Ta Paul.

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#2 73SUNBURSTEXYOUWON

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Posted 11 December 2020 - 07:59 PM

Hi, going back some years. I bought this Rusty P.O.S.

Tried soaking it with CRC for a week to try n free thing's up.
Anyway, eventually got the Big Nut undone, that was the easy bit...but the piston was seized solid.

So had to literally smash the piston out, with an F.B.H. , in a good well mounted vice.

Then off to BHSS in Capalaba Brisbane....resleaved the bore stainless steel, rekitted it myself. And working fine.

:)

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#3 Indy Orange

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Posted 11 December 2020 - 08:07 PM

Thanks Jaso, I might try dunking it in diesel .

#4 73SUNBURSTEXYOUWON

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Posted 11 December 2020 - 08:12 PM

Use a good socket or ringspanner on the bignut. N hold the M.C. nice n firm in th vice, the nut will come undone.

It may help to give the Big nut a couple of good wacks on the end face, to free up the thread.

Protect the face of the Bignut with something flat, so you dont ding up the surface of the Nut.
:)

Thanks Jaso, I might try dunking it in diesel .


Yeah, cant hurt.

Cheers :)

#5 claysummers

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Posted 12 December 2020 - 06:39 AM

In vice and rattle gun after a soak and or heating in mums oven



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#6 Ice

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Posted 12 December 2020 - 07:38 AM

Penetrene is you’re friend Paul 



#7 sibhs

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Posted 12 December 2020 - 09:12 AM

Hi Paul,

 

After my experience I'd just take it in the brake reconditions and let them do it. 

HiTech Brake and clutch in Wangara are the go. Cheaper than buying a kit and doing it myself. I know, I've done it both ways.

 

 

Marty



#8 grumpy xu1

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Posted 12 December 2020 - 10:20 AM

It's an 1" & a 1/2" socket, make sure that you purchase a single hex if you do it yourself, a 12 point ring spanner is going to f@ck it, if its already that tight. Diesel for a week, is probably a good idea, take the cap & lid rubber of & keep it, to reuse them.

#9 meanmachine72

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Posted 12 December 2020 - 10:21 AM

i put mine in a shop at Gosford, i found out later they sent it away capalaba  :furious: when it came back it was missing the piston  :banghead:

the gosford shop blamed the mob in QLD and they in turn blamed the gosford shop..so then i had to source a piston, just make sure

the back part of piston has the right depth as they come in 2 depth sizes



#10 grumpy xu1

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Posted 12 December 2020 - 10:22 AM

If you have a really good spare lc big nut lid, that you would sell, let me know please.

#11 dattoman

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Posted 12 December 2020 - 11:23 AM

Remove pistons before soaking

petroleum based solvents will swell the seals and you wont ever get the pistons out



#12 Indy Orange

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Posted 13 December 2020 - 07:02 PM

The big nut is well and truly seized Datto ,it's only a spare so I just wanted to inspect the inside .Will try soaking it.thanks guys.




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