Anybody got a spare vacuum unit or know where I can find one- managed to find one second hand for free but it has the same problem- big leak in the diaphragm. It a 1973 v8 HC engine. Not essential I know but might improve the mpg a little. Just fitted electronic points and its running very nicely now so just want to complete the job on the ignition.
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Distributor - vacuum unit - Vacuum unit
- Thread starter Overover
- Start date
Rumblin_Ron
New Member
I bought one new from J Weekly's about 2 years ago, wasn't exactly cheap tho, about £30 I think.
you can take the unit apart - I did it 3 times - by unfolding the crimped over edge. Inside is a diaphragm: cloth impregnated with rubber or similar that acts on the lever that screws in the middle - a spring holds it in its quiescient state.
It may be posibld to repair it - I failed so made one from some bicycle inner tube - unfortunately that almost worked but geting the crimped edgeto seal is difficult or so I found.
In the end I got one from Wadhams; seem to remember it being quite pricey; £40 or so. And sod's law meant the mounting on the new unit did not match my dizzy so I had to drill and tap the dizzy; apparently I had the rarer model.
You may find a later dizzy, RR or SD! going cheap but you would need to sawp the oil pump gear over; having said that, it is easy to conver from p6-<sd1 gears but not sure the other way; if not, you would use the oroiginal spindle; more messing but not that hard.
It may be posibld to repair it - I failed so made one from some bicycle inner tube - unfortunately that almost worked but geting the crimped edgeto seal is difficult or so I found.
In the end I got one from Wadhams; seem to remember it being quite pricey; £40 or so. And sod's law meant the mounting on the new unit did not match my dizzy so I had to drill and tap the dizzy; apparently I had the rarer model.
You may find a later dizzy, RR or SD! going cheap but you would need to sawp the oil pump gear over; having said that, it is easy to conver from p6-<sd1 gears but not sure the other way; if not, you would use the oroiginal spindle; more messing but not that hard.