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big nut master cyl

Started by _scottya!_ , Feb 27 2009 09:15 PM

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#1 _scottya!_

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Posted 27 February 2009 - 09:15 PM

I have 2 big nut master cylinders, could some one please ID them for me.
numbers as follows:- 10J4N
15J6R

also 2 brake booster numbers
VH 279
VH 346

Thanx in advance
cheers scott

#2 fuzzypumper

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Posted 28 February 2009 - 10:01 AM

Big Info can be found on these earlier posts:
http://www.gmh-toran.......&hl=big nut
or
http://www.gmh-toran.......&hl=big nut

Looks like you have M/cyls made in 10th Oct 1974 (10J4N) and 15th Oct 1976 (15J6R).

The booster VH279 is a UC Torana that came mostly on 6cyl , manual, with rear drums brakes.
Cant tell much more about this one.

The booster VH346 is the a UC Torana dual diaphram unit which was physically smaller than the original
dual booster available on the LH/LX. Looks like the one that came on HZ Statesman SL/E.
Still its a good booster as it takes up less room under the bonnet of a V8 torana, its shorter and smaller diameter.
Still has horizontal M/cyl studs so takes the standard Mcyl with seperate proportioning valve.
Does not take very late UC combo M/cyls which are like Commodore.

I believe the VH346 booster was standard equiptment on the following models:
UC 4cyl Auto & Manual with rear discs
UC 6cyl Auto only with rear drums
UC 6cyl Auto & Manual with rear discs
This doesnt mean much as you can use them on just about any LH/LX/UC model.

#3 _scottya!_

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Posted 28 February 2009 - 10:52 AM

Thanx fuzzypumper, the VH 347 came of late model 11/77 LX sedan i have. I thought it was dual diaphran.
The others i have no clue.
Will read other post, thanx again
scott

#4 _HQ SS_

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Posted 28 February 2009 - 11:00 AM

Hi Scott.
are these numbers/letters correct 10J4N 15J6R, if so I am interested to see if anyone as a explanation as to the meaning
of the N and the R in these details.
I have read that most have A or P on them meaning AM shift and PM shift so what do the N and the R stand for.
Cheers Paul.

#5 fuzzypumper

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Posted 28 February 2009 - 12:48 PM

I suppose being a late 11/77 LX it may have had the new revised booster designed for the UC due to stock.

I saw somewhere that the suffixes denoted that state these GMH manufactured Mcyls where made but the code must be cryptic .

Edited by fuzzypumper, 28 February 2009 - 12:50 PM.

#6 _scottya!_

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Posted 28 February 2009 - 04:45 PM

Hi Scott.
are these numbers/letters correct 10J4N 15J6R, if so I am interested to see if anyone as a explanation as to the meaning
of the N and the R in these details.
I have read that most have A or P on them meaning AM shift and PM shift so what do the N and the R stand for.
Cheers Paul.



Hi Paul,
Yeh these numbers are correct.
These 2 master cyls. both have disc stamped on the nut aswell.
The 10J4N was attached to a big booster like the SS, A9X, SLR5000 and so on !
The 15J6R was attached to a skinny littlr booster VH 279

Some one on here must possibly know.

#7 dattoman

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Posted 28 February 2009 - 05:00 PM

However... in theory neither of these masters would be on a UC
The outlet ports are around the wrong way

And A9X and late UC ran plastic bottle master cylinders anyway.

#8 _scottya!_

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Posted 28 February 2009 - 05:16 PM

Posted Image
Posted Image
Posted Image
Posted Image

This set up came of a 12/76 LX sedan
L16 M40 GU8
Had a 9 inch, it was a rolling shell when i bought it.
The bloke was going to put a chev in it.

#9 _lx-304_

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Posted 02 March 2009 - 09:11 AM

it maybe the angle but that r looksa little out of wack, like a p with a scratch under it.it is definately part of the letter.the leg doesnt look to be as deep as the p part of it.


dave

#10 _MR & MRS L34_

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Posted 02 March 2009 - 09:55 AM

I have seen a few with cast numbers or part numbers in the master cylinder body have either of these have any numbers ,i have never seen one ending in a N or R very interesting.
Pete

#11 fuzzypumper

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Posted 02 March 2009 - 11:28 AM

it maybe the angle but that r looksa little out of wack, like a p with a scratch under it.it is definately part of the letter.the leg doesnt look to be as deep as the p part of it.


dave


Good pickup, Looking at it a second time I would say you could be correct.
Scotya, maybe clean it up some more.

#12 _scottya!_

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Posted 02 March 2009 - 02:43 PM

lx-304, well done :clap: :clap:

rubbed it back with some 2000 paper

sprayed some black paint on it

and presto !!

Posted Image

I do apologize

i will have to double check the other one as well

surely i couldn't mistaken the N for any other letter

#13 _scottya!_

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Posted 03 March 2009 - 04:34 PM

Heres a picture of the other big nut master cylinder clearly showing the letter N,

Posted Image
Posted Image

#14 dattoman

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Posted 03 March 2009 - 04:42 PM

Oh and by the way
A VH347 is a left hand drive export hatch

#15 _scottya!_

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Posted 03 March 2009 - 04:53 PM

Oh and by the way
A VH347 is a left hand drive export hatch


Please explain 'dattoman'

#16 dattoman

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Posted 03 March 2009 - 07:10 PM

VH347 was the code for a LHD export booster
Yes they sent them offshore
No they didn't build any LHD SS's

#17 fuzzypumper

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Posted 04 March 2009 - 02:31 AM

You mean it was also used on the LHD export but not exclusively.
The info I posted earlier about the VH347 came straight out of the GMH UC Torana parts catalogue which incidentally
mentions nothing about LHD/export part numbers.
I pulled a VH347 Booster off a UC Torana 6cyl (with aircon, Disc/drum) at the wreckers a few weeks ago.

Edited by fuzzypumper, 04 March 2009 - 02:32 AM.

#18 _lx-304_

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Posted 04 March 2009 - 12:55 PM

maybe N is someones idea of a joke being noon.neither am nor pm or they were not too bright and picked it by mistake.

dave

#19 _scottya!_

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Posted 04 March 2009 - 02:04 PM

Is there any hard evidense out there to lend any support to the fact that "A" is for AM and "P" for PM
Seems to be a lot of guessing going on.

#20 _lx-304_

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Posted 04 March 2009 - 04:55 PM

i dont really know but it makes more sense than a for automatic like i was once told,as it would make no difference to what box you run.

dave

#21 Bazza

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Posted 04 March 2009 - 05:38 PM

i dont really know but it makes more sense than a for automatic like i was once told,as it would make no difference to what box you run.

dave


or P for Performance as I was once informed.

Bazza

#22 fuzzypumper

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Posted 04 March 2009 - 06:03 PM

Just to throw another option in the mix, it could also be the hour of the day the cylinder was made.
e.g A=12am-1am ....... or A = the first hour of production of that day......

#23 _lx-304_

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Posted 04 March 2009 - 07:50 PM

^^^completely off topic,but is a fuzzypumper what im lead to believe what it is.


dave

#24 _scottya!_

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Posted 04 March 2009 - 09:18 PM

I guess we will never know what the letters really mean.

well i suppose its fair assume the all the "A" and " P " theories are just that........Theories !!!

now we know that the letters "A", "N", and "P" exist, can anybody else post pictures of other

big nut masters with different letters to the above.

#25 fuzzypumper

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Posted 04 March 2009 - 11:43 PM

^^^completely off topic,but is a fuzzypumper what im lead to believe what it is.


dave


Interpretation is the key.
However to set the record straight it was a knick name given to me at high school in reference to my thick,
large & healthly follicles on my head. I believe that explains the "Fuzzy" part of the knick name..... :)
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