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Stromberg leak, again!


haggis
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Hi everyone, I seem to be replacing rubber ‘o’ Rings from the brass adjustable jet on the bottom of a stromberg on a regular basis, as they just keep leaking. I have a couple of spare carbs and have checked them all and the adjustable jet seems too loose in the brass jet holder and moves around a bit in all of them, is this normal? I’m assuming these things can’t really wear as the tolerance is in the ‘O’ ring. It’s not leaking from the brass jet holder/ float chamber housing ( the big O ring) always on the adjustable jet.

Any ideas how to stop it leaking? 

I’ve looked at all the usual suppliers but can’t find replacement jet holders,  Can you buy new ones somewhere? 

Thanks as always. 

Hag 

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Its normal for the jet to be a bit of a slack fit in the jet holder,

I suspect you have been sold some mickey mouse O rings , , many are a minimal fit , where did you get them from??

Try some from burlen or carb exchange 

They are a special size , you wont find one in a universal  box or Os from anywhere.  

Pete

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Hi Pete, well initially I bought some from Rimmers but they worse, so went to Canley in the end, better but don’t seem to last long. Should they be slack enough to be really easily turned? I assumed they need at least need a bit of grip to keep them in position? 

Thanks 

hag 

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yes there should be some degree of grip or ...it leaks  stiff enough to turn by hand with a penny etc.

try a bead of hylomar or similar  around the  O  , allows a turn and doesnt fully set   may give you some relief

ive had  O's in kits that are too small a section ,    think its a  copy , well its round sort of spec  made for petrol...Nooooo !!!

give burlen a call 

Pete

 

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lets us know if they work,  there cnt be any wear in the jet carrier or .jet barrel as theres little movement other than when turning to adjust the jet, 

do check for any corrosion inside the carrier which migh wreck 0 rings 

i always add a smear of grease on reassembly of the jet  assy. and chamber O rings 

Pete

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On 3/5/2018 at 8:05 AM, Pete Lewis said:

They are a special size , you wont find one in a universal  box or Os from anywhere.  

Pete

I may be getting mixed up with something else but were the carb rings not originally supplied from the factory as more of an oval and therefore sat out further around the circumference, but all we can get these days is round, so it's not the best replacement? I'm talking about the cross section, rather than the shape! You're right in that standard O rings from a selection are never the best fit, so I agree you'll have to go to a specialist for the better ones.

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  • 3 weeks later...
On ‎06‎/‎03‎/‎2018 at 1:20 PM, haggis said:

Hi, placed an order with Burlen, not sure 4 tiny ‘O’ rings should cost £3.95 to send though!

Hello Hag.

Great to hear the O rings have done the job, I have to say Burlen are very good and very helpful. I know what you mean about p&p - it really is a subjective situation; I have certainly known other companies charge more for such items. Many companies do not deal with weight & size, just a standard tariff for many items. I usually console myself by accepting it would cost far more in fuel to collect items and when something works as it has done for you then it really fades from memory.

Dave's tip on the rubber grease is sound and additionally it prevents the rubber from perishing quicker than it should, so that has to be a good thing.

Overall, a job well done with a positive outcome.

Well done.

Regards.

Richard, 

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