Big nut master cylinder .
Posted 02 September 2021 - 09:54 PM
Posted 03 September 2021 - 07:00 AM
Hi all,I have a LC big nut master cylinder which has been fully reconditioned,however the piston depth is deep (LJ standard type)I have the LC shorter pin in the booster. Can I just find a standard LJ booster piston and use that instead of the LC one?Thanks Paul.
Yes, they are easily swapped if you can get the LJ type pushrod to suit your booster.
Posted 25 September 2021 - 07:08 PM
Edited by Indy Orange, 25 September 2021 - 07:15 PM.
Posted 25 September 2021 - 07:19 PM
Posted 25 September 2021 - 08:00 PM
M/cyl is the same for both single and double diaphragm boosters.
Even with the reaction disc missing you should still have brakes (albeit they will be violent in their application) if the pushrod is the correct length for the m/cyl.
You need to undo and ease the master cyl away from the booster and measure the length of pushrod protruding past the face of the booster.
Posted 25 September 2021 - 08:40 PM
Posted 25 September 2021 - 09:02 PM
No, that is about correct for LC (about 8mm if memory serves me correctly) not LJ.
LJ should be around 25mm protruding past the face of the booster.
Posted 25 September 2021 - 09:09 PM
just had my XU1 booster reconditioned and he had to make me a new rod, he also reconditioned my big nut master cylinder and adjusted booster master cylinder clearance.
Hope this will help you
Posted 25 September 2021 - 09:12 PM
Posted 25 September 2021 - 09:15 PM
Posted 25 September 2021 - 09:28 PM
Yeah I believe that’s correct push rod for LC and a VH212 booster . It has to be the master cylinder piston depth which is wrong for my LC.
The pushrod currently in your booster is one you recently bought and was supposed to be from an LJ or LH booster?
How does the pushrod you got from the forum member compare to the length of the pushrod you already had?
LJ pushrod for single diaphragm booster should be about 100mm long from memory..
Edited by S pack, 25 September 2021 - 09:33 PM.
Posted 25 September 2021 - 09:32 PM
Posted 25 September 2021 - 09:53 PM
Edited by Indy Orange, 25 September 2021 - 09:54 PM.
Posted 25 September 2021 - 10:11 PM
Yeah, LC should be about 17mm shorter than LJ which means LC pushrod is about 83mm overall length.
Next need to remove the rod from your booster and compare it side by side with your old one.
Looks like the acorn nut shaped tip has been adjusted right in on the one currently in your booster.
Perhaps there may be enough adjustment available to get the extra 17mm you need?
Edited by S pack, 25 September 2021 - 10:16 PM.
Posted 26 September 2021 - 06:36 AM
Lc =84mm. (101 -17 shorter than Lj's)
Lj =173mm. Dave I. Has 180mm from a LH Torana , however S Pack has 156mm Nos item (Lc xu1) so 156 +17 =173 mm
Lc =156mm as per S Pack's nos item.
Here's a link to the thread.
"xu1 booster push rod length - Page 2 - Brakes, Wheels and Tyres - GMH-Torana - Page 2" http://www.gmh-toran...d-length/page-2
Posted 26 September 2021 - 11:31 AM
James , thanks for that measurement info mate, I got my measurements wrong,so it seems I now have to find a LJ type pushrod 101mm long , I’d rather do that than take off the master cylinder, travel 4 hours to get the piston changed , then travel 4 hours back .
You definitely live and learn with these cars , just when you think you’ve nearly finished, you haven’t really.
If anyone has a long type LJ pushrod to sell I’d be interested 101mm long , cheers fellas.
Edited by Indy Orange, 26 September 2021 - 11:32 AM.
Posted 26 September 2021 - 11:42 AM
Posted 26 September 2021 - 12:40 PM
Edited by Indy Orange, 26 September 2021 - 12:41 PM.
Posted 27 September 2021 - 10:23 AM
Posted 27 September 2021 - 06:27 PM
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