03-04-2025, 09:57 PM
Hello again,
Thanks Stuart for the phone call. Since then, I've managed to pinch 5 minutes and investigate a little further. The downdraft SU carburettor
(the dashpot lies horizontally with the "top" being near the bulkhead) had no oil in the dash pot so I've now put some in. My initial thought that, perhaps there was no piston was incorrect. Having removed the dash pot cover, there is a largeish casting inside (a piston) which slides in and out of the main body of the carburettor which has a needle attached to it that goes into a small hole. There is also a spring in there too. My only thought is, should there be another piece in the "top" of the piston? I've some vague recollection of there being another part between the brass cap and the main piston on a Morris Minor I owned 25 years ago but I may be mistaken.
I've not tried to start the car since due to it being late but will try to see if this has made any difference tomorrow if I get chance as "somebody else" wants to go out for the day instead.
I guess that if this hasn't worked, I could try to put the downdraft Zenith from the other (broken) engine on and see if this works better than the SU - I doubt it can be any worse.
I'll try to keep you all posted as and when I get chance.
And then there's the whining gearbox to contend with but that's for another day...
Best wishes,
Nick
Thanks Stuart for the phone call. Since then, I've managed to pinch 5 minutes and investigate a little further. The downdraft SU carburettor
(the dashpot lies horizontally with the "top" being near the bulkhead) had no oil in the dash pot so I've now put some in. My initial thought that, perhaps there was no piston was incorrect. Having removed the dash pot cover, there is a largeish casting inside (a piston) which slides in and out of the main body of the carburettor which has a needle attached to it that goes into a small hole. There is also a spring in there too. My only thought is, should there be another piece in the "top" of the piston? I've some vague recollection of there being another part between the brass cap and the main piston on a Morris Minor I owned 25 years ago but I may be mistaken.
I've not tried to start the car since due to it being late but will try to see if this has made any difference tomorrow if I get chance as "somebody else" wants to go out for the day instead.
I guess that if this hasn't worked, I could try to put the downdraft Zenith from the other (broken) engine on and see if this works better than the SU - I doubt it can be any worse.
I'll try to keep you all posted as and when I get chance.
And then there's the whining gearbox to contend with but that's for another day...
Best wishes,
Nick