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Big Nut Master Cylinder Caps.

Started by IanC , Feb 10 2022 11:06 AM

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#1 IanC

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Posted 10 February 2022 - 11:06 AM

Does anyone know if the caps and locking arms are interchangeable on all the square cornered big nut master cylinders.   I see there is a couple of different caps between the models.   Some have two mound top cap (LJ I think).  Some have flattish style top cap. (LH I think).      cheers Ian.


#2 S pack

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Posted 10 February 2022 - 01:09 PM

Does anyone know if the caps and locking arms are interchangeable on all the square cornered big nut master cylinders.   I see there is a couple of different caps between the models.   Some have two mound top cap (LJ I think).  Some have flattish style top cap. (LH I think).      cheers Ian.

I thought the bail and lid were the same on all square ended big nut cast iron m/cyl up to the end of 1976.

Might learn something new.
 


#3 IanC

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Posted 10 February 2022 - 04:07 PM

Thanks Dave. I bought a big nut for my car, but it was for LC. I just bought another which is LH. Just hoping I can change the lid.

#4 IanC

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Posted 10 February 2022 - 04:23 PM

Next question Dave, can you buy the different lids.

#5 dattoman

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Posted 10 February 2022 - 05:45 PM

Nope on lids

 

And they are different shapes

The LC one... is it really LJ as they aren't squared and if so... same as LH

 

LC is rounderIMG_2688.jpg

 

LH is squarer 

s-l640.jpg

 

Late ones are just plain ugly

 

s-l400.jpg


#6 IanC

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Posted 10 February 2022 - 05:59 PM

I have a round one.   The round ones I believe are LC.  Square ones LJ onwards.  The lids are different on differing square ones. just need to know if the lids and bails fit all the square ones. because i would like to have the LJ one and at present it appears to be an LH/LX.   cheere Ian.


#7 dattoman

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Posted 10 February 2022 - 09:14 PM

LJ and LH are the same

 

Now your turn to put up pics


#8 S pack

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Posted 10 February 2022 - 09:34 PM

My LJ bignut lid & bail is the same as this.

s-l640.jpg


#9 grumpy xu1

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Posted 10 February 2022 - 10:29 PM

What did you pay for lc 1 Ian ? Is the cap in gc & would you sell it again ? Gary.

#10 Dr Terry

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Posted 11 February 2022 - 08:35 AM

I have a round one.   The round ones I believe are LC.  Square ones LJ onwards.  The lids are different on differing square ones. just need to know if the lids and bails fit all the square ones. because i would like to have the LJ one and at present it appears to be an LH/LX.   cheere Ian.

The square ones began @ HQ release which is the same time as 173 & Aussie 4-sp release in July 1971 LC.

 

Dr Terry


#11 hanra

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Posted 11 February 2022 - 09:06 AM

This is mine.

Attached Files


#12 IanC

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Posted 11 February 2022 - 04:54 PM

What did you pay for lc 1 Ian ? Is the cap in gc & would you sell it again ? Gary.

Gary I can't remember what I paid.  it is marked Drum 26 H1A .   Yes I will sell it.   Cap is quite rusty.  I will take some pics and PM you if you want.  I'm happy for you to make an offer.  cheers Ian.


#13 bat 53

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Posted 12 February 2022 - 10:56 AM

mine is round type


#14 claysummers

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Posted 12 February 2022 - 11:11 AM

And yours is a 173 LC isn’t it Albert? But early one. They would have used up the bin before they changed to the HQ type.


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#15 S pack

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Posted 12 February 2022 - 11:43 AM

And yours is a 173 LC isn’t it Albert? But early one. They would have used up the bin before they changed to the HQ type.


Agree Clay, the LC type m/cyl and booster continued in production after HQ release and 173 introduction.


#16 IanC

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Posted 12 February 2022 - 12:00 PM

Dave, do you know if you can buy new tops and bails like your M/C.   And my car is 02/72, round or square?.   


#17 S pack

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Posted 12 February 2022 - 12:41 PM

Hi Ian, I believe Neil is correct, the metal caps are NLA. I thought RSP were making reproductions but I can't find any on their website.

Your 2/72 LJ should have this one.

s-l640.jpg


#18 IanC

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Posted 12 February 2022 - 07:01 PM

Bugger.   if you had to choose, would you go LC round or LH square flat.   First World problems I know.   But still.....   :banghead:


#19 claysummers

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Posted 12 February 2022 - 08:34 PM

After market jobby 15de9b7bb8cda55c8b4c5828f444a89a.jpg


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#20 grumpy xu1

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Posted 12 February 2022 - 09:45 PM

Bugger.   if you had to choose, would you go LC round or LH square flat.   First World problems I know.   But still.....   :banghead:


Well if i had an xu1, then i would fit the correct master cylinder for that car. Forget the aftermarket, just put the word out for an lj 1. Be a little patient.

#21 IanC

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Posted 14 February 2022 - 11:16 AM

https://photos.app.g...EvJN2gDEpgcapv7

https://photos.app.g...3QzzJiwAJgsUZs9

https://photos.app.g...fPFixj4vKrY4EH6

#22 claysummers

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Posted 14 February 2022 - 02:53 PM

There is a square cap on gumtree at the moment. Not a lot of good with out the body.


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#23 IanC

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Posted 14 February 2022 - 04:04 PM

I have the square body also..  I will have a look thanks Clay..



There is a square cap on gumtree at the moment. Not a lot of good with out the body.


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Clay could you PM me the link cheers mate...


#24 claysummers

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Posted 14 February 2022 - 05:52 PM

Done


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#25 IanC

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Posted 15 February 2022 - 11:34 AM

I got this today, and have an LJ style lid coming. https://photos.app.g...vQfUyaY3TvpSwL6
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