Why??

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Originally Posted by Davo

Yes, Loctite and I bash the ends as well.

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Yep, that's what I did :) I couldn't really bang the ends over though. I did a fantastic job of it .... I replaced the very few 'O'rings... stuck the new diaphram in, the float measured perfectly with both with old/new needle and seat in there. Fired her up and it sounded fantastic.... Yeah smart person I am I didn't take it for a test drive. I got about two streets from home today before limping back, choke full out in 1st gear and grabbed a different car .... Obviously the carby I had apart now doesn't like to do anything other than idle. I guess that's the new diaphram not sealing (I can't see what else it could be given I didnt actually change anything really).

I did however make up the special tool:

Make Your Own Zenith Stromberg Carburetor Tool S-353 : MG Midget Forum : MG Experience Forums : The MG Experience

Before you ask, yes it does take me forever to get around to finishing anything :)

seeya,
Shane L.

Sometimes the butterflys stick after they have been disturbed and need a light hone where they contact the throat. You can see if the end of the spindle is turning when you move the accelerator cable.

Regards Philip A

Quote:

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Originally Posted by PhilipA

Sometimes the butterflys stick after they have been disturbed and need a light hone where they contact the throat. You can see if the end of the spindle is turning when you move the accelerator cable.

Regards Philip A

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The throttle is turning... it's just leaning straight out... That's how I managed to drive it back with the choke full out. I bet the new diaphram hasn't sealed, if my understanding is right, diaphram leaking air == no fueling :)

seeya,
Shane L.

Correct.
There is a tab on the diaphragm which has to go in a slot, and ditto on the plunger.
Regards Philip A

Hang on ... The plunger has a slot ? I think I know why the carby isn't working :wasntme: I didn't see any guides/slots on the plunger, it appeared to be held in place by the diaphram (that's why the tool I made to adjust mixtures has a "tag" on the outer part so you your holding the piston, and not applying rotating force to the diaphragm while adjusting the needles. ?

woops... :)

seeya,
Shane L.

http://www.howacarworks.com/illustra...rettor-482.jpg

Look at the hole in the side of that piston. If the diaphram can slot on it more than one position when attached piston side, then when you line up the "notch" on the outer edge, the air/fuel passages in the piston are not going to be in the right spot (ie: if 90degrees out of line they may no longer be in the air flow).

seeya,
Shane L.

Maybe I wasn't clear.
The outer rim of the diaphragm has a little nipple thing which slots into a slot in the carb body.
I am hazier on this but AFAIR there is also a guide which ensures that you put the piston on the diaphragm the correct way around .
With the two things correct , the piston is pointing in the correct direction.
Regards Philip A

why did I ever touch this bloody thing ... at least it ran before even if it wasn't right.

I whipped the top back off the carby and the diaphram was all good (infact you could see it lift if you looked down the throat of the carby ...

Off with the carby .... Float bowl full ... I blew compressed air through the only two orifices I could find ... I did do that before, but then spray carby cleaner down there afterwards, so figured I might have blocked them back up..... Put it all back together.,... sweet, running heaps better. So I head up the street... revs out perfectly in 1st gear, then dies in the arse as it leans right out and half the motor dies .... You gotta be ****ing kidding me :wallbash: :wallbash:

The new needle and seat mustn't flow enough fuel :confused: So I pulled the bloody carby back off (gee's I'm getting good at that ... have it down to a fine art :censored: ). So put the old needle and seat back in .. Put it all back together ... head up the street ... sweet finally .......... hit 2500 rpm in 2nd gear and it dies in the arse ........... AARRRRRhhhhhh,..,

Now what do I do ?? I guess I pull it back off into a million little piece and try and see if there is anything wrong (I can't understand how when I didn't actually change anything and it's all gone back identically) ... You'd swear it's simply not getting enough fuel, but how is that possible when I didn't need to change the float level and it measure perfectly :(

Guess how much fun this is :censored:

seeya,
Shane L.

Well here's another "WHY" :o "Why always me" ... type question :bangin: :wallbash: :wallbash:

I pull that bloody carby back off .... carry it into the office and sit down at a desk with it.... Pull the bastard of a thing into tiny bits..... Nothing ... not a bloody single thing wrong... It's the simplest most basic carby I've ever pulled apart.... So why in the hell can't I get it to work :censored: It's definitely starving for fuel...

I had a brainwave and whipped back to the car, the fuel line flare joint doesn't have an "O"ring that has broken up and blocked the carby up ..................... Sigh ... nope, standard flare joint :( So I put the carby back together carefully blowing through every hole in it I can find (there's not many, it's the most simple thing I've come across)....... Measure the float level again ...... Absolutely spot on .... Couldn't be more perfect if I wanted it to be :confused: So I removed the needle and seat and blasted through that with 120psi of air .... the very last orifice in the carby I can think of.............. Something came out of there at about 1000miles and hour, bits of it splattered me on the way past.

Can you believe that :eek: I **** you not, this sort of thing could only happen to me ... A bloody spider/insect had crawled into the carby inlet (or fuel line) on the car over the week it was apart and blocked the fuel intake.... So you could get enough fuel past it for the motor to idle, try to drive though and the fuel bowl in the carby would get drained and you'd die.

I'm now back to where I started a week ago, on the bright side I'm bloody good and pull the carby off and stripping it down now.... And I also have the tools so I can adjust the mixtures made up so I can finally tune it.

seeya,
Shane L.

And that's why you always plug and block and cover things up when you leave them. I guess you'll do that from now on! :p

They are a wonderfully simple design, though, aren't they? That's one reason they used them. They are also sort of "self-cleaning" in the way the needle moves up out of the the jet.

I've got a factory tuning manual and a Haynes manual for them but I can't scan them at the moment, otherwise I'd put them up since they're both long out of print.