Morris Minor Owners Club

hiiiiiiiiiii everybody. going to try and adjust the timing tomorrow but feeel i ought to check the vacuum advance is working ok..... how do i check that the vacuum advance is working

If you suck on the attached tube it should cause the mechanism to turn slightly.

If when you suck there is no resistance ie you can't make a vacuum, then the diaphragm has failed - if you can make a vacuum but the plate in the dizzy doesn't move then either the plate is seized (so try release oil) , or the vacuum unit is seized........ Any which way - you will need a new one! They rarely work if over 20 years old.....

Ok thanks and where's the plate in thanks distribbutor thing

Oh dear......it's obvious when you take the cap off..............

as you say its obvious, i just checked and to my amazement it seems to work fine. its a 25d distributor, now i intend to advance the timing as discussed in a previous thread as we have the 12g940 head on, i tried to advance it on the knurled knob but it was already right forward, what sort of increments should i be advancing by, 1mm 5mm 25mm! and i assume i just mark where i start and then go from there or are there some marks on it already?
got a tiny oil leak since fitting the 12g940 head at the corner nearest the front exhaust manifold if anyone is interested? its only just visible so i guess not to worry abooooot!

Just turn the dizzy a couple of mm clockwise - then you can wind back the knurled knob slightly to mid-stroke and play about from there.

ok, thanks if i can wangle it past the mrs ill get it done tommorrow, gonna try and do the brakes as well...

well i managed to wangle it and got the brakes done and did the 1st adjustment on the dizzy, i marked it up and twisted clockwise about 3mm.. i think it has worked as it has now lost its 'turbo lag' on acceleration and ive never haed it before but i think it is pinking... to me it sounds like hitting a piece of copper tube against a bit of metal. Its only apparent when i put in 4th and try to accelerate when its doing about 10 - 20mph. difficult to hear over noise of exhaust tho!

That's pinking, try retarding it on the knurled nut till it stops.

thanks will try to do this eve, not driving in the mean time tho

My engine pinks very slightly just as I start to slog it - then it quiets down. Certainly don't run it with continuous pinking!

Its only apparent when I put in 4th and try to accelerate when its doing about 10 - 20mph.

You shouldn't be lugging it that hard, no wonder it's pinging.

i dont normally, it was just to see.......... you know like touching paint to see if its dry even thought you know its wet!

Aah so