[xk] which carbs do I have?

Greetings, Probably a stupid question,but here goes. On my 54
xk120, I have what I thought were HD6 carbs . They where obviously
replaced at some point before I bought the car. I was taking them
off for rebuild and noticed that the inlet(air cleaner) dimension
was 1 1/2’’ whilst the outlet (manifold) of the carb is 1 3/4’’.
Now I know the HD6 (or any SU 6) should be 1 3/4’’ , but I was
curious about my 1 1/2inlet. Is this normal? Thanks much for any
input on this matter-George–
GEOD998
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

George,

You will find the inlet side of the carbs is 1 5/8", and the outlet (throttle disc end) is 1 3/4". That is normal. You should have H6 carbs on a 120 (float chamber held on by single bolt).

Regards,

David Lonsdale
Classic Carburetters
Cirencester, UK
+44 (0) 7786 912011--------------------------------------------
On Sat, 10/10/15, GEOD998 geod998@gmail.com wrote:

Subject: [xk] which carbs do I have?
To: xk@jag-lovers.org
Date: Saturday, 10 October, 2015, 21:50

Greetings, Probably a stupid
question,but here goes. On my 54
xk120, I have what I thought were HD6 carbs . They where
obviously
replaced at some point before I bought the car. I was taking
them
off for rebuild and noticed that the inlet(air cleaner)
dimension
was 1 1/2’’ whilst the outlet (manifold) of the carb
is 1 3/4’’.
Now I know the HD6 (or any SU 6) should be 1
3/4’’ , but I was
curious about my 1 1/2inlet. Is this normal? Thanks
much for any
input on this matter-George

GEOD998
–Posted using Jag-lovers JagFORUM
[forums.jag-lovers.org]–

In reply to a message from David Lonsdale sent Sat 10 Oct 2015:

Thanks much David.Very good information. Yes I know that they
should be H6s on there, and I was debating on ordering a pair.
Someone must have cobbled the HDs on there at some point,and I
feared they might be HD4s? which would have made it a lot easier
to justify the cost of H6s, at least in my mind. I’ve owned this
car since the 80s,but I just finished the restoration (as if that
ever happens :)). Sure wish I would have noticed the improper
carbs a few decades ago…might have been a little less costly to
correct back then. Any suggestions on where to source some healthy
H6s (other than SU)? Thanks again -George–
The original message included these comments:

You will find the inlet side of the carbs is 1 5/8’’, and the outlet (throttle disc end) is 1 3/4’’. That is normal. You should have H6 carbs on a 120 (float chamber held on by single bolt).


GEOD998
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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On the side of the main body, there is a CAST-IN number.
Tell us what that is, and that will positively identify type of carburetter.

On the top-mounting-flange, there are some stamped in letters/numbers.
Tell me what they are and that will tell you age of your SU carburetters.

Pretty easy to tell if original to your 54 XK120 or not, or if not original,
still correct for your XK120, or if they are someones modification.

Roger Payne
XK140MC OTS; 4.2E OTS; DaimlerSV8
Canberra, Australia

.-----Original Message-----
From: owner-xk@jag-lovers.org [mailto:owner-xk@jag-lovers.org] On Behalf Of
GEOD998
Sent: 11 October, 2015 07:50
To: xk@jag-lovers.org
Subject: [xk] which carbs do I have?

Greetings, Probably a stupid question,but here goes. On my 54 xk120, I have
what I thought were HD6 carbs . They where obviously replaced at some point
before I bought the car. I was taking them off for rebuild and noticed that
the inlet(air cleaner) dimension was 1 1/2’’ whilst the outlet (manifold) of
the carb is 1 3/4’’.
Now I know the HD6 (or any SU 6) should be 1 3/4’’ , but I was curious
about my 1 1/2inlet. Is this normal? Thanks much for any input on this
matter-George

GEOD998
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

In reply to a message from GEOD998 sent Sat 10 Oct 2015:

George,

David L is modest and did not write he does wonderful work on
restoring the SU carbs.
I would buy a used pair (every now and then avialable on ebay
for reasonable money) and send them off to David for
restoration…

Tadek–
ysmalkie
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–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

In reply to a message from Roger Payne sent Sat 10 Oct 2015:

Roger, carb body has AUC7081w. stamped in. Mounting flange has
010 stamped into it. Thanks , George–
The original message included these comments:

On the side of the main body, there is a CAST-IN number.
Tell us what that is, and that will positively identify type of carburetter.
On the top-mounting-flange, there are some stamped in letters/numbers.
Tell me what they are and that will tell you age of your SU carburetters.


GEOD998
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

In reply to a message from GEOD998 sent Sun 11 Oct 2015:

sorry AUC7081w is cast in-not stamped–
GEOD998
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In reply to a message from GEOD998 sent Sat 10 Oct 2015:

Try Joe Curto, he may have a pair. I probably have 3 or 4 of the
H6s, but they are all disassembled. I should put them together and
sell them.
Joel–
ex jag, '66 E-type S1 4.2, '56 XK140dhc, '97 XJ-6
Denison, TX, United States
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In reply to a message from GEOD998 sent Sat 10 Oct 2015:

Should be a aluminum tag under the float bowl bolt samped AUC 577F
or AUC 577R for the correct H6 (non-Type-C head). If the tag is
different you can look up that number to determine the origin of
that carburettor. I used to use the Burlen Fuel System website
for that.–
The original message included these comments:

Greetings, Probably a stupid question,but here goes. On my 54
xk120, I have what I thought were HD6 carbs . They where obviously
replaced at some point before I bought the car. I was taking them
off for rebuild and noticed that the inlet(air cleaner) dimension


Mike Spoelker
Louisville,Kentucky, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

George,

AUC7081 is an HD6 ‘Body-bare-rear’ as used on Mark VIII, 3.4 litre, XK150
and Mark 2, and is not as you already know, an H6 as used on XK140.

I do not recognise the ‘010’ stamping - are you sure about the first number
‘0’, or have you misread a letter P or Q

Rather academic anyhow as the main thing is that it is an incorrect HD6
model of carburetter, which you can certainly get to work OK, but of no use
at all if you want to return your XK140 back to original.

Roger Payne
XK140MC OTS; 4.2E OTS; DaimlerSV8
Canberra, Australia

.-----Original Message-----
From: owner-xk@jag-lovers.org [mailto:owner-xk@jag-lovers.org] On Behalf Of
GEOD998
Sent: 12 October, 2015 02:41
To: xk@jag-lovers.org
Subject: RE: [xk] which carbs do I have?

In reply to a message from Roger Payne sent Sat 10 Oct 2015:

Roger, carb body has AUC7081w. stamped in. Mounting flange has
010 stamped into it. Thanks , George

The original message included these comments:

On the side of the main body, there is a CAST-IN number.
Tell us what that is, and that will positively identify type of
carburetter.
On the top-mounting-flange, there are some stamped in letters/numbers.
Tell me what they are and that will tell you age of your SU carburetters.


GEOD998
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Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

Mike (and others interested),

I have almost completed a very extensive paper on H6 carburetters, and hope
to have it published early next year, so have to say, I do not agree with
the comments about these ‘aluminium tags’.

It is my strong belief that both Jaguar factory-fitted H6 and H8
carburetters DID NOT have these aluminium-tags fitted.
But H6 and H8 carburetters supplied by SU as loose sets, to both SU and
Jaguar spare-parts outlets did have them fitted as a means of
identification, as did most probably any factory reconditioned/exchange
units.

Given the vast majority of twin H8 carburetters were supplied as spare-parts
sets, and were not actually factory fitted, these days you see more H8 with
their 702 or 777 (or AUC702 or AUC777) tags, than factory fitted H8 without
any tags. But with H6 being very common factory supply to XK120/140/Mark
VII you correctly rarely see any with tags (as the factory and SU had
systems in place to ensure correct specification H6 went onto correct model
Jaguar without any call for identifying tags).

But SU did make blank tags available for SU authorised workshops, to stamp
them up as required, after refurbishing H6 or building up a stock of
spare/exchange units.

The other bugger-factor - and I note that you refer to Burlen. Burlen is
in the business of providing new repro carbs, and new spare-parts for
original SUs, and invariably always supply reproduction/rebuilt H6 with
these tags, or can supply loose blank tags, so todays reconditioners who
don’t know any better are now starting to fit (non-original) tags to their
rebuilt H6s.

You also need to be careful with Burlen, as their focus is not on
originality - but instead provide parts/information as per the latest SU
factory supersession as of when the SU factory ceased to make Carburetters
and Petrol Pumps, so if you buy a repro H6 it will be their best efforts as
of SUs 1960s specification, and not as we would prefer to original 1950s XK
specification.

To be sure of what you have, you need to look at part-numbers cast onto all
of the aluminium castings, as well as any etched numbers and stamped-in
numbers. Loose tags fitted at some later time are not an accurate guide.

By the time you get to HD6 and HD8 carburetters - certainly in the 1960s,
albeit I am still unsure about the late 1950s, then factory fitted HD6 and
HD8 now DID HAVE these tags attached, but the concept of the F, C, R suffix
(Front, Centre, Rear) on the tag was not something seen until 1960s.

So even though AUC577 is indeed the correct specification number for a pair
of H6 carburetters suitable for a late XK120 OTS only, who knows for sure
whether the easily added/replaced tags accurately reflect the carburetters
they are fitted to?
Indeed I have several loose/spare tags amongst a box full of SU parts I
have, easily fitted onto anything.

Roger Payne
XK140MC OTS; 4.2E OTS; DaimlerSV8
Canberra, Australia

.-----Original Message-----
From: owner-xk@jag-lovers.org [mailto:owner-xk@jag-lovers.org] On Behalf Of
Mike S
Sent: 13 October, 2015 00:43
To: xk@jag-lovers.org
Subject: Re: [xk] which carbs do I have?

In reply to a message from GEOD998 sent Sat 10 Oct 2015:

Should be a aluminum tag under the float bowl bolt samped AUC 577F or AUC
577R for the correct H6 (non-Type-C head). If the tag is different you can
look up that number to determine the origin of that carburettor. I used to
use the Burlen Fuel System website for that.

The original message included these comments:

Greetings, Probably a stupid question,but here goes. On my 54 xk120, I
have what I thought were HD6 carbs . They where obviously replaced at
some point before I bought the car. I was taking them off for rebuild
and noticed that the inlet(air cleaner) dimension


Mike Spoelker
Louisville,Kentucky, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]-- --Support
Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

In reply to a message from Roger Payne sent Mon 12 Oct 2015:

Thank you for the correction, Roger, and duely noted. I used to
buy a lot of used HD8’s. As you note, the tags are easily removed
or replaced with whatever might be at hand, but if they are
present, they can give you some information as to the original
fitment. I mistakenly extrapolated their presence on 1960-70’s
units back into the 1950’s. Best regards.–
The original message included these comments:

Mike (and others interested),
I have almost completed a very extensive paper on H6 carburetters, and hope
to have it published early next year, so have to say, I do not agree with
the comments about these ‘aluminium tags’.


Mike Spoelker
Louisville,Kentucky, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

1 Like

In reply to a message from Mike S sent Tue 13 Oct 2015:

Can someone please identify carbs
Main body AUC 6040 AA
Fuel Bowl 1208 D
Auto choke AUC 2755
Most appreciated–
Jordymk5
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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Need more information Graham!

AUC6040 AA says they are one of the very last made H6 carburetters made in
c1957 or so, after no longer used for Jaguar application as original
equipment, but still possibly a post-production spare part for a Jaguar.

Can you advise what addition numbers are ETCHED adjacent to the AUC6040AA
cast number, and if twin carbies will be different on front and rear.
Also can you advise letters/numbers stamped on the top flange of the main
body where it mounts against the gasket to the inlet manifold.

On advise of ETCHED numbers, and stamped in numbers, I can 100% identify
them.

If you have sourced these locally in Australia, there is a reasonable chance
that they may be ex-ROVER (or another brand) rather than being ex-JAGUAR,
but again advise of ETCHED numbers will tell me for sure, and what if any,
are the implications.

The AUC6040AA cast number simply tells me that these are the third MAJOR
bare-casting variation for an H6 carburetter, the etched numbers then tell
me what maching has been done to that bare casting to suit a specific car
model/specification application. Everything else bolts on.

Roger

Roger Payne
XK140MC OTS; 4.2E OTS; DaimlerSV8
Canberra, Australia

.-----Original Message-----
From: owner-xk@jag-lovers.org [mailto:owner-xk@jag-lovers.org] On Behalf Of
Jordymk5
Sent: 29 October, 2015 14:26
To: xk@jag-lovers.org
Subject: RE: [xk] which carbs do I have?

In reply to a message from Mike S sent Tue 13 Oct 2015:

Can someone please identify carbs
Main body AUC 6040 AA
Fuel Bowl 1208 D
Auto choke AUC 2755
Most appreciated

Jordymk5
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Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

In reply to a message from Roger Payne sent Wed 28 Oct 2015:

Hi Roger.
Thanks for the response.
Only other stamping on them is 6N (or N9)on the flange.
What should I expect a July 54 120 FHC to have on each
carb? I do have another pair I am presently trying to
locate. Hopefully these are the correct ones. Will let you
know what these have on them once located.
Regards, Jordy
120 FHC 669181–
Jordymk5
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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Jordy,

The N9 stamping on the flange is the H6 carbies date-of-manufacture, N being
a code for 1956 and the 9 for September.

So September 1956 date-of-manufacture.
This is the earliest dated AUC 6040 AA body I have now recorded, with only
N10 and N11 otherwise seen, with the November 1956 example the latest H6 I
have seen, of any variation.
Now we know XK140 still used H6 carburetters up until the last ones made in
1957, but I do not have advice from any January 1957 XK140 owners as to the
date-code on their carburetters, but I strongly suspect nothing later than
N10 or N11 as the H6 was very much being run-out by end of 1956, with SU now
introducing the new model HD6 as used in XK150/ 3.4 litre Mark 1/ Mark VIII

But H6 carbies were used on other Makes of Cars, and this is only
confirmed/identified by the suffix number ETCHED alongside the AUC 6040 AA
CAST number.
It would help if you could advise what suffix number is ETCHED on yours.

(an unfortunate mistake many restorers make when restoring their SUs is to
excessively bead-blast to clean the cast-aluminium body, and in doing so
totally remove this fairly light ETCHED suffix, not having been aware it was
there under all the years of grime accumulated - best to carefully
chemically clean or hydro-blast clean being careful around this etched
number.)

For a July 1954 XK120 FHC I would expect that H6 carbies with the SECOND
MAIN-BODY casting showing a cast AUC 6040 X on the body in the same place as
your current AUC 6040 XX cast number.
But same applies - there will be an ETCHED suffix that tells you whether the
H6 is ex-Jaguar, or say ex-Rover, Lea Francis, Morris etc (and this is
important as the different suffixes determine what machining has been done
to the main casting in order to bolt-on/fit/attach the suite of components
to build the body up to the desired specification H6 or twin-H6 assembly.

So if you locate a non-Jaguar AUC 6040 XX bodied H6, you may need to source
Jaguar associated parts to substitute for non-Jaguar parts fitted, and may
need to block-up surplus holes/threads or drill new ones yourself into the
cast-body - it can be done of course, but having the correct information on
what to do is difficult to advise, albeit once identified by the SUFFIX
number ETCHED that is easier.

Now of course you realise, a FRONT H6 cast-body differs from a REAR H6
cast-body in a Jaguar twin-H8 thermo-carbie set up, allowing the bodies to
be built up to appropriate FRONT and REAR H6 respectively, so its best to
look for a second-hand TWIN-H6 Thermo carbie set-up to begin with, rather
than individual H6 from different sources. Will significantly improve
your chances of the set up being ex-Jaguar given Jaguar were the dominant
user of twin-H6-thermo set-ups from SU.

To be exact - the twin-H6 carbies on a July 1954 would be expected to have
date-stamp L5 or L6 (1954 May or June), as in 1954 at least, the SUs were
usually dated 1 to 2 months prior to the XK120s date-of-manufacture.

Roger Payne
XK140MC OTS; 4.2E OTS; DaimlerSV8
Canberra, Australia

.-----Original Message-----
From: owner-xk@jag-lovers.org [mailto:owner-xk@jag-lovers.org] On Behalf Of
Jordymk5
Sent: 7 November, 2015 06:20
To: xk@jag-lovers.org
Subject: RE: [xk] which carbs do I have?

In reply to a message from Roger Payne sent Wed 28 Oct 2015:

Hi Roger.
Thanks for the response.
Only other stamping on them is 6N (or N9)on the flange.
What should I expect a July 54 120 FHC to have on each carb? I do have
another pair I am presently trying to locate. Hopefully these are the
correct ones. Will let you know what these have on them once located.
Regards, Jordy
120 FHC 669181

Jordymk5
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Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

In reply to a message from Jordymk5 sent Fri 6 Nov 2015:

Thanks Roger for your input and clear reply.
I will attempt to find the suffix numbers on those carbs
and also the second pair.
Most appreciated. Regards
Jordy. 669181–
Jordymk5
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In reply to a message from Jordymk5 sent Sun 8 Nov 2015:

Can I ask for these ones to be decoded
L7
AUC 6040 X
1208
Regards Jordy
669181–
Jordymk5
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G’day Jordy,

Sorry for belated response, but been in Melbourne for a week and half, and
my Tablet OK to read emails, I cannot (don’t know how) respond in ‘plain
text’ as required by this site.

Your single H6 has a couple relevant clues, but still missing the most
important detail to be 100% sure.

L7 says its July 1954 date-of-manufacture.
The AUC6040 X tells me it is the second main variation of an H6 carburetter
MAIN BODY casting, so typical of that used by Jaguar on 1954 XK120 and Mark
VII, also 1955 and early 1956 XK140 and Mark VIIM, so still not totally
correct for your 1953 XK120, but pendants aside, close enough.
The 1208 is the fuel-bowl.

But I need to know the ETCHED numbers adjacent to the AUC6040 X cast
numbers, to confirm whether carbie is correct for 1954 Jaguar, or some other
make of 1954 car - Rover, Austin Healey, etc etc

And one other clue - alongside the L7 stamping, is there a second adjacent
stamping or not? If so, what is it.
If there is NOT a second adjacent stamping its unlikely to be a Jaguar
application H6, but if it does have a second stamping will help to identify
whether Mark VII or XK application originally.

And that’s important, as although you can do a lot of mixing/matching of
different model H6 carburetters originally built up to suit various models
of cars, you need to know what differences and thus what modifications you
need to make to say turn a Rover H6 into a suitable XK H6.

Roger Payne
XK140MC OTS; 4.2E OTS; DaimlerSV8
Canberra, Australia

.-----Original Message-----
From: owner-xk@jag-lovers.org [mailto:owner-xk@jag-lovers.org] On Behalf Of
Jordymk5
Sent: 13 November, 2015 16:36
To: xk@jag-lovers.org
Subject: RE: [xk] which carbs do I have?

In reply to a message from Jordymk5 sent Sun 8 Nov 2015:

Can I ask for these ones to be decoded
L7
AUC 6040 X
1208
Regards Jordy
669181

Jordymk5
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Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

Hi Roger,

I wonder if you can help identify the build date of the carbs on my XK120 (Dec 1950)? They have the early-style thermo carb attached to the rear float bowl, with the shorter-type dashpots. On each carb flange is F11, no other stamp visible. From what I’ve read here, the 11 would indicate November, but what about the F? If L is 1954, then counting back to F would suggest late 1940s… could this be right?? Maybe there wasn’t an I in the list? Here’s a pic of the carbs. Unfortunately, I don’t hace them close by to examine at the moment, but will do so when I get the chance.