Webcon UK Ltd

sausagefingers · New user Joined: 09 Jan 2009 Posts: 2

Hi,

I need to refurb a pair of 36 IDF's from an Alfa boxer engine.

One of the pair will refurb with a service kit and a few available bits and pieces. On the other hand, it's pair had an entirely seized throttle shaft.

I had to destroy the integrity of the shaft in order to get it out as the bearings were (still are) solid, despite having been soaked in releasing fluids for over two weeks.

I'm pretty sure there are no new replacement shafts left in the world for this type of carb so I'm thinking of having a pair machined using the remaining shaft as a pattern! Shocked

Costly I know...

I'm going to need a couple of butterflys too, which, with a bit of luck, I ought to be able to get online somewhere. I already have bearings to refurb both carbs.

Before I go ahead and make any firm decisions, I need to ask a couple of questions and maybe take on board some advice.

Is there any hope of interchageability between a shaft from a 40 IDF and a 36? I wouldn't have thought so but think it best to ask first.

What do you think the viability is of having shafts engineered as replacements?

Has anyone had any experience of resolving a similar problem?

The only alternative is to buy another set of carbs but I'd much rather refurb the ones I have.

Thanks in advance. Smile

bigjim5551212 · Posted: Mon Jan 19, 2009 5:21 am Post subject:

you can get shafts either made or maybe look on ebay for some or look for some more carburetors at the breakers. Talk to Webcon them selves and see if they know of any. They may be available in Italy from RCA, their agent is ACAR in Milano http://www.acarmilano.com/
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Jim Hilton
Overseas Distributing
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sausagefingers · New user Joined: 09 Jan 2009 Posts: 2

Thanks for the info , I have now contacted ACAR.

admin · Site Admin Joined: 03 May 2007 Posts: 32

Webcon do still have new 36IDF carbs and they may be quite reasonable to buy. Your best action is to contact the sales department on sales@webcon.co.uk or 01932 787100 and they will let you know prices

dave999 · Posted: Thu Sep 17, 2009 11:08 am Post subject:

to get the old bearings out

1 you will need to remove the dust cover, round metal with 2 holes in it

2 then knock the bearings out

both involve using heat

your local DIY or cooks shop will have small blow torches. you want a small torch that can direct a nice but small blue flame at a small area only on a carb that has been completely dried out and dismantled no fuel and no rubber parts (remember the rubber dough nuts on the idle mix screws)

use it to apply heat to the casting around the bearing boss

once hot use either circlip pliers or ground down long nose plyers in the holes in the dust cover to turn it. this will result in it slowly being moved out of the casting
pulling it will just bend it

next job
as you have a broken shaft cut a 1 inch section off the end that inludes the step
put it up the bore and into the bearing
using a long screwdriver or punch through the oposite bearing and down through the casting

tap the bearing out while applying heat with your little blow torch.

stick in genuine weber or find a suitable sealed ball or roller bearing to replace. i prefer the dellorto style and a bearing supply place will be leagues cheaper. no daft dust cap

are your carbs going back onto an un altered alfa engine??

they will be Alfa specific carbs with air bypass screws and the idle circuits fed off the main circuit. i.e different from normal weber IDFs
i.e less options on the air flow into the idle jet stack. its govered by a brass sleaved drilling in the carb top near the stack rather than a section in the top of the jet holder

no worries i have used these with great sucess on VW engines up to 1700 cc with only choke and jet changes

if idle was a problem you can get the brass sleaved hole drilled out and a new bigger or small brass sleave fitted which can be reamed out to the size you need. loads of messing with an air line and the carb in bits but achieves the same ends as changing the idle jet holder.

you can esily spot these carbs

the idle jet holder has 1 thread and 1 rubber seal on it
on a normal none OEM production car IDF the idle jet has two threads and no seal.

don't think 36s were made for anything other than OEM fitment

but as with a lot of things i'm probably wrong

Dave