[Mgs] Removing throttle shafts from SU carbs.

[Simon Matthews]

At least one of the shafts is leaking. I was able to show this by
spraying brake cleaner on the shaft at the point that it goes in to
the carb.

So my plan is to see if new shafts are sufficient to fix the leak. If
not, I will have to send the carbs off for new bushings.

Simon

On Sat, Feb 25, 2017 at 10:19 PM, David Ambrose via Mgs
<mgs at autox.team.net> wrote:
>
> Worn throttle shafts will have steps in them which will prevent them from
> just sliding out. tapping or wiggling them will get them moved to an unworn
> area where they will just slide out of the carburetter bodies.
>
> The seal around the throttle shaft is critical to the proper functioning of
> the carb. If the throttle shafts have any slop in them, air will leak in,
> which makes it difficult to properly set the mixture, and sync the carbs.
>
> You'll need to replace the throttle shafts if they're worn. You may also
> need to replace the bushings in the throttle body. There are companies that
> will replace the bushings, then ream them to the proper diameters. Joe Curto
> comes to mind, but there are others.
>
> Cheers,
> Dave Ambrose
>
> On 2/25/2017 3:46 PM, Simon Matthews via Mgs wrote:
>>
>> That was easy!
>>
>> Based on the threads on one end of the new shafts for the HS4 carbs, I
>> had thought that the shaft had to come apart before it came out. I had
>> not tried to just tap it out.
>>
>> Thanks!
>>
>> Simon
>>
>> On Sat, Feb 25, 2017 at 3:33 PM, Osborne, Paul <paul at ece.rochester.edu>
>> wrote:
>>>
>>> They should come out . I would give the shaft a slight tap with a soft
>>> face
>>> hammer.
>>>
>>> pau
>>>
>>>
>>> Paul Osborne
>>> Department of Electrical and Computer Eng.
>>> University of Rochester
>>> 201 Hopeman Building RC
>>> Rochester NY 14627
>>> 585-275-5226
>>>
>>>
>>>
>>> On Feb 25, 2017, at 5:48 PM, Simon Matthews via Mgs <mgs at autox.team.net>
>>> wrote:
>>>
>>> I am disassembling a set of HS2 carburetors (I think they are HS2s) so
>>> that know how to replace the throttle shafts on a set of HS4 carbs
>>> from a '71 MGB.
>>>
>>> I have got to the point that I have removed the spring and fittings
>>> from the shafts, I have removed the throttle plate, but I don't know
>>> how to get the shafts out.
>>>
>>> It appears that something should unscrew from one end of the shafts,
>>> but nothing seems to move.
>>>
>>> Can anyone give me a suggestion of what I need to do next?
>>>
>>> This photo shows the current state of the carbs:
>>>
>>> https://urldefense.proofpoint.com/v2/url?u=https-3A__goo.gl_photos_XMXPNPuDkozHPn6R6&d=DwICAg&c=kbmfwr1Yojg42sGEpaQh5ofMHBeTl9EI2eaqQZhHbOU&r=j_uK0-rtrtcKZ8O0aGq-Y5ZUDfHjCD_Cv57WMn_czag&m=nnaVOvJVP61iWXZ3fr3fTASbrGaIedU3BWt6lK0Gk_M&s=F3-U2dby9vHwwXMXSwGblsSSRpui0Q-Kc0K7WUGN5QA&e=
>>>
>>> Simon
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>
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