Amazon: Weepy Stromberg advice.

[Alf ista]

Hi all. Haven't posted in quite a while, though I do check in most days. I have an issue with my Stromberg carb and I hope the knowledgeable folk on here will give me some sage advice. As you can see in the pics below there is a leak from the carb that is going onto the manifold. Obviously not the best situation, though I do feel it is just the dashpot oil as I need to top it up with oil before every spin. I use ATF. I want to fix this but am not sure what is causing the problem. Is there a particular seal inside the Stromberg that normally causes this that needs replacing or could it be something else? Any advice appreciated.
Hugh.

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[Triple-S]

Strombergs have a habit of leaking petrol from the O-ring seal at the bottom of the float chamber - does your leakage smell of fuel? Admit it looks like oil from the pic, and seems to be coming from the carb-to-manifold join.
Could you be over-filling the ATF in the dashpot? You have to leave enough space for the screw-in plunger otherwise it will force excess out. Does your car smoke a bit when first started - as if oil is getting into the manifold then engine?
If you do need to check that bottom O-ring it is frankly easier if the carb is removed from the car (4 nuts) as it probably means removing the float chamber from the bottom. The seal is at the bottom, to prevent the contents from leaking (not a good design), however some models of cars have a decent-fitting plug there - still, a look will give the opportunity to clean it out of the almost-certain crud the fuel filter hasn't caught.

P

[Ron Kwas]

Hugh;

I have very little experience with ZS so the following advice will be general only...fuel would evaporate quite quickly for the hot manifold after motor shut-off, ATF less quickly, and needing to top it up often pretty much confirms that is what is weeping/leaking...so its a matter of finding the path ATF is taking...I agree with OP...removing carb from manifold and giving it a careful once over (with a particular eye on any path or seals or seams between ATF holding compartment and intake tract) would be my next move...

Good Hunting!

[Derek UK]

As said, don't over fill. Fill tube only to about half an inch from the top. The piston will displace a bit and raise the level anyway. I'd use 3 in 1 or 20 sae. The small, cheap, general purpose light oil cans from the supermarket are fine and they usually have a convenient nozzle. Not much difference in viscosity to ATF but a bit more sticky and less prone to flow. Might be a good time to pop off the top and fit a new diaphragm after a good clean up.
Yes the lower O ring seal can weep on the carbs with the removable bottom nut but that doesn't look to be the case here.

[Alf ista]

Thanks all. There is no smell of fuel so I am sure its not that. I have replaced the diaphragm in the past so I think that is ok. I also don't overfill the dashpot, I think anyway. Could the oil leak from the carb to manifold gasket if that had failed? To me, it looks like it comes from there and it would be an easy fix if that was the case.

[volvoid]

arent y supposed to put engine oil into a dashpot ?