10 replies to this topic

[BenH]

Hi guys.

my weber 45 i bought off ebay appears to be cracked.see picture. looks like one of the screws has been overtightenned and cracked the case on the underside of the carb. pictures not the best but its all i have as i dont have the car at my place.

without going into the safety aspect,(fire hazard etc) would chemical metal work on the crack? ie would petrol eat through the chemical metal


also have no idea what the screw holds in? theres two and they hava a sort of lock tab on them .

if chemical metal or similar product wouldnt work can anyone recommend what to do or is it scrap?

i just need to get the car running so i can fix the clutch then i can sort out getting a new weber if need be. but at the minute i cant afford another £150 plus for a weber



http://sphotos.ak.fb...1_6214763_n.jpg

[Cater_Racer]

Hi Ben,

I cracked the float chamber ron mu SU's when the engine mount failed. I tried chemical metal, which was "impervious to petrol" and it proved useless the thing failed in 48 hours.

The resolution was a new float chamber............. Sorry.

[Ivor Badger]

If its the hex head with the red circle, it doesn't matter. Its the locking screw for the auxiliary venturi and completely dry. The other one at the other end of the locking plate is for the main venturi and again dry. They sinply hold the venturis in place and srop them rotating and shouldn't be overtightened.

Edited by Ivor Badger, 28 June 2010 - 07:38 PM.

[BenH]

Thanks guys. its definatly leaking fuel so has it caused more damage than meets the eye?

didnt want to hear that aha!

[Kerrin]

Unfortunately this problem is a common fault with 45 dcoe's as people overtighten the choke bolts which causes the cracking you have. It does nit happen on 40s as the chokes are retained differently by springs.

If you are getting fuel leaking out of the crack it is unlikely that chemical metal will stay in place, the heat from the engine will expand the body of the carb and re split the joint.

(unfortunately been there done that)

The crack may also allow in air which could mess up the mixture of the carb and cause poor running.

Look out for another carb is my thoughts, shame you got done over by an eBay seller.

[stardude]

as the body is aluminium, could you get a locel machine shop to weld it up with a TIG welder?

[armotorrepsirs]

as the body is aluminium, could you get a locel machine shop to weld it up with a TIG welder?

Iv come a cross this a few times with customers cars and one of my own the crack can be repaired and save you spending out on a new floatchamber or carb. Do you have Tig welder or an alloy welder?

[Ivor Badger]

I can't really see why the screw should leak under normal use. The venturi is a snug fit in the casting and runs under low pressure. The only time the screw could possibly leak is when stopped and then there should be no fuel in the venturi as it takes the lower pressure in the venturi when running to draw the fuel from the float chamber.

[sebmini]

lumiweld?

[roofless]

we've got tig here Ben - ask alex nicely he might give it a go for you, but you need to get rid of all traces of petrol first LOL

[Kerrin]

we've got tig here Ben - ask alex nicely he might give it a go for you, but you need to get rid of all traces of petrol first LOL

Really interested to see if this works for you, I could have saved a load of cash on my old twin 45's if I knew they could be tig welded.