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Old 12-15-2005, 12:01   #1 (permalink)
Graham G
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Zenith Carbs

Brother got his IIa up and running today, however he tells me that its
running like a bag of spanners!! He says that it ticks over fine, but under
acceleration it misses and chuffs out black smoke. Has turned the mixture
screw right in, and it will continue to run and accelerate with black smoke.
Economy diaphram has a small tear in it, is this likely to be the cause?? He
also seems to think ther is excessive wear around the hole through which the
shaft holding the flutter valve sits (apparently petrol comes out rount
here, but he thinks its a result of the huge amounts of fuel being dumped
into the system).

Should he get a repair kit? Is it something he's missing, or shoud he just
throw it in the hedge and buy a new one?

Any help is appreciated as he is baffled ATM.

Cheers

--
Graham

101 GS
101 Rad Bod


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Old 12-15-2005, 13:01   #2 (permalink)
Alex
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Re: Zenith Carbs

On Thu, 15 Dec 2005 19:35:51 -0000, "Graham G" <NOSPAM@here.com>
wrote:

>Brother got his IIa up and running today, however he tells me that its
>running like a bag of spanners!! He says that it ticks over fine, but under
>acceleration it misses and chuffs out black smoke. Has turned the mixture
>screw right in, and it will continue to run and accelerate with black smoke.
>Economy diaphram has a small tear in it, is this likely to be the cause?? He
>also seems to think ther is excessive wear around the hole through which the
>shaft holding the flutter valve sits (apparently petrol comes out rount
>here, but he thinks its a result of the huge amounts of fuel being dumped
>into the system).
>
>Should he get a repair kit? Is it something he's missing, or shoud he just
>throw it in the hedge and buy a new one?
>
>Any help is appreciated as he is baffled ATM.
>


I had a lotta trouble with a Zenith/Stromberg carb on my IIa, despite
a rebuild with an overhaul kit, it still did strange things. I
replaced it with a brand new Weber, not had a single problem since.

Apparently they can have problems with warped carb bodies, something
to do with problems during casting.

Alex
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Old 12-15-2005, 13:01   #3 (permalink)
Richard Brookman
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Re: Zenith Carbs

....and Alex spake unto the tribes of Usenet, saying...


> On Thu, 15 Dec 2005 19:35:51 -0000, "Graham G" <NOSPAM@here.com>
> wrote:
>
>> Brother got his IIa up and running today, however he tells me that
>> its running like a bag of spanners!! He says that it ticks over
>> fine, but under acceleration it misses and chuffs out black smoke.
>> Has turned the mixture screw right in, and it will continue to run
>> and accelerate with black smoke. Economy diaphram has a small tear
>> in it, is this likely to be the cause?? He also seems to think ther
>> is excessive wear around the hole through which the shaft holding
>> the flutter valve sits (apparently petrol comes out rount here, but
>> he thinks its a result of the huge amounts of fuel being dumped into
>> the system).
>>
>> Should he get a repair kit? Is it something he's missing, or shoud
>> he just throw it in the hedge and buy a new one?
>>
>> Any help is appreciated as he is baffled ATM.
>>

>
> I had a lotta trouble with a Zenith/Stromberg carb on my IIa, despite
> a rebuild with an overhaul kit, it still did strange things. I
> replaced it with a brand new Weber, not had a single problem since.
>
> Apparently they can have problems with warped carb bodies, something
> to do with problems during casting.
>
> Alex


The original Zenith on the 2a was well knackered, so I replaced with a
"Zenith type" (ie pattern) carb from Cra/Paddocks. It lasted a few months,
by which time it was so warped it would hardly run at all. The gap between
the lid and body on the front edge was over 1mm in the centre. Flatting the
mating surfaces on fine emery on a glass plate helped but didn't cure it.
Alex is right - it's something to do with the heat-treating during
manufacture, and there are a lot with this problem AIUI. It would not idle
evenly, even when set to idle at >1000rpm, ran extremely rich, and turning
the mixture screw in and out made no difference. I bit the bullet and got a
new genuine Zenith (now being manufactured by Burlen www.burlen.co.uk). Bit
pricey, but runs like a dream now.

--
Rich
==============================
Disco 300 Tdi auto
S2a 88" SW
Tiggrr (V8 trialler)


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Old 12-15-2005, 14:01   #4 (permalink)
scruttocks
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Re: Zenith Carbs

Richard Brookman wrote:
>I bit the bullet and got a
> new genuine Zenith (now being manufactured by Burlen www.burlen.co.uk). Bit
> pricey, but runs like a dream now.
>


Could I ask roughly how pricey, looking on the website it says price = ask.

Tia
--
scruttocks
k12rs r80g/s sIIa
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Old 12-15-2005, 15:01   #5 (permalink)
Richard Brookman
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Re: Zenith Carbs

....and scruttocks spake unto the tribes of Usenet, saying...


> Richard Brookman wrote:
>> I bit the bullet and got a
>> new genuine Zenith (now being manufactured by Burlen
>> www.burlen.co.uk). Bit pricey, but runs like a dream now.
>>

>
> Could I ask roughly how pricey, looking on the website it says price
> = ask.
> Tia


Can't remember exactly, but it was a good bit over a ton - about 120 plus
the usual, I think. Give 'em a ring - they were very helpful to me.

--
Rich
==============================
Disco 300 Tdi auto
S2a 88" SW
Tiggrr (V8 trialler)


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Old 12-15-2005, 15:01   #6 (permalink)
scruttocks
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Re: Zenith Carbs

Richard Brookman wrote:

> ...and scruttocks spake unto the tribes of Usenet, saying...
>
>
>
>>Richard Brookman wrote:
>>
>>>I bit the bullet and got a
>>>new genuine Zenith (now being manufactured by Burlen
>>>www.burlen.co.uk). Bit pricey, but runs like a dream now.
>>>

>>
>>Could I ask roughly how pricey, looking on the website it says price
>>= ask.
>>Tia

>
>
> Can't remember exactly, but it was a good bit over a ton - about 120 plus
> the usual, I think. Give 'em a ring - they were very helpful to me.
>



Thanks, I've got a fair bit of rust to exorcise before I can start
putting the shiny bits on, I can feel one coming on in the spring though
(hopefully).

--
scruttocks
k12rs r80g/s sIIa
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Old 12-15-2005, 15:01   #7 (permalink)
Richard Brookman
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Posts: n/a
Re: Zenith Carbs

....and scruttocks spake unto the tribes of Usenet, saying...


> Thanks, I've got a fair bit of rust to exorcise before I can start
> putting the shiny bits on, I can feel one coming on in the spring
> though (hopefully).


I didn't regret it...

--
Rich
==============================
Disco 300 Tdi auto
S2a 88" SW
Tiggrr (V8 trialler)


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Old 12-16-2005, 03:01   #8 (permalink)
Paul - xxx
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Re: Zenith Carbs

Graham G came up with the following;:

> Should he get a repair kit? Is it something he's missing, or shoud he just
> throw it in the hedge and buy a new one?


As Alex and Richard have said, a replacement 'other make' carb is a very
worthwhile investment. My S3 never ran properly with a zenith, but did with
a weber.

there are a few things you can do, as you suggest, the repair kit might
work, the flatting of mating surfaces might work, a damn good clean of the
petrol pipes, tank, sedimenter and carb might also help, as would checking
that air can also get in. A screwed air filter might also make one think it
could be the carb when it isn't ...

--
Paul ...
(8(|) Homer Rules ..... Doh !!!

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Old 12-16-2005, 07:01   #9 (permalink)
David G. Bell
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Re: Zenith Carbs

On Friday, in article <40fjajF19b890U1@individual.net>
notcheckedever@hotmail.com "Paul - xxx" wrote:

> Graham G came up with the following;:
>
> > Should he get a repair kit? Is it something he's missing, or shoud he just
> > throw it in the hedge and buy a new one?

>
> As Alex and Richard have said, a replacement 'other make' carb is a very
> worthwhile investment. My S3 never ran properly with a zenith, but did with
> a weber.
>
> there are a few things you can do, as you suggest, the repair kit might
> work, the flatting of mating surfaces might work, a damn good clean of the
> petrol pipes, tank, sedimenter and carb might also help, as would checking
> that air can also get in. A screwed air filter might also make one think it
> could be the carb when it isn't ...


The oil-bath air filter is pretty free-flowing, though it's worth
cleaning out. I've had the semi-flexible air-hose on a diesel suffer an
internal collapse, which is serious black-smoke time.

--
David G. Bell -- SF Fan, Filker, and Punslinger.

"I am Number Two," said Penfold. "You are Number Six."
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Old 12-16-2005, 13:01   #10 (permalink)
Paul - xxx
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Re: Zenith Carbs

"David G. Bell" came up with the following;:
> On Friday, in article <40fjajF19b890U1@individual.net>
> notcheckedever@hotmail.com "Paul - xxx" wrote:
>
>> Graham G came up with the following;:
>>
>>> Should he get a repair kit? Is it something he's missing, or shoud he
>>> just throw it in the hedge and buy a new one?

>>
>> As Alex and Richard have said, a replacement 'other make' carb is a very
>> worthwhile investment. My S3 never ran properly with a zenith, but did
>> with a weber.
>>
>> there are a few things you can do, as you suggest, the repair kit might
>> work, the flatting of mating surfaces might work, a damn good clean of
>> the petrol pipes, tank, sedimenter and carb might also help, as would
>> checking that air can also get in. A screwed air filter might also make
>> one think it could be the carb when it isn't ...

>
> The oil-bath air filter is pretty free-flowing,


Unless, of course as we found out, some nerk leaves their oily rags inside
the bloody thing.

> though it's worth
> cleaning out. I've had the semi-flexible air-hose on a diesel suffer an
> internal collapse, which is serious black-smoke time.


Almost anything that stops the flow of air is black smoke time, IME.

--
Paul ...
(8(|) Homer Rules ..... Doh !!!

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