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The Restoration of my DHC has started


Beans

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  • 3 months later...

Hi Beans

my carburetor (HS6) throttle spindle shaft bushes are worn which by now makes it impossible to adjust a stable idle.

Did you ever replace the carburetor throttle spindle shaft bushes? or can you recommend someone who would do that for a reasonable price (no need to buy a complete refurbished carburetor).

To me the seemingly cheapest solution would be to buy an oversized spindle and fit it in with an adjustable reamer ... but I guess it is not so easy.

Regards

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7 hours ago, Thomas4 said:

Did you ever replace the carburetor throttle spindle shaft bushes?

Yes, machined the alloy bodies and fitted spindle bushes (from Southern Carburettors)
But that was done locally by a friend over here in the NL. 

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  • 4 weeks later...

I ended up buying a set of refurbished carburettors from Turner Carbs

https://www.su-carbs.co.uk/

Unfortunately at first I could not set the idle speed; even with the idle screw completely out it idled at about 1500 rpm. The problem was that the left carburettor's throttle valve did not shut completely by the force of the return spring, as it is supposed to. Only if I pressed the throttle shut manually the idle dropped to 750 rpm as it is supposed to. I then unscrewed the two screws holding the butterfly disc to the spindles and moved the spindles in and out until the disc centered and the unwanted gap was reduced. Now I got a nice idle a 750 rpm and the car runs very well. Although the refurbished/remanufactured carburettors were not very cheap it was well worth it in the end, the car feels much less worn out overall.

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1 hour ago, Thomas4 said:

I ended up buying a set of refurbished carburettors from Turner Carbs ... I then unscrewed the two screws holding the butterfly disc to the spindles and moved the spindles in and out until the disc centered

That is something that should have been done by a reputable SU specialist !?

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Also recently I fitted a new water pump, of course thereby replacing all the O-rings and gaskets to stop water leaks, had a new clutch fitted (after the old one didn't disengage any more, due to a rusted and broken spring in the plate as we later found out), fitted a refurbished starter motor, and finally fitted EBC vented brake discs (as part of an upgrade kit with a bigger brake booster, Ford Escort calipers and Capri brake discs I got 'National' discs which were not round to start with, or at least I failed to mount them so there would be less than 0.05 mm wobble, because I didn't have a dial gauge at the time) so now there is no brake judder any more. The car is now in the best state since I have had it and probably decades before that (and at least the brakes are better than when the car was new)

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