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· Club polo shirts / Badges
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· Technical Pages
· Past Events/Photos
· Other NZ Clubs
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· Site Map
· Series MM
Technical Pages - ELECTRICAL
Getting Your Spark Advanced - (taken from Capital Minors, January 2000)
instant the throttle is opened above idle speed, suction from the increased RPM
will pull the diaphragm of the governor against a spring and rotate the points
holding plate in the distributor in the advanced direction.
The spark is set at idle speed up to 600 RPM when all systems are at rest according to the degree of time at 5 to 8 degrees before top dead centre. (TDC) This setting is standard for a smooth idle, but not sufficient advance to get any power for driving and will advance the spark to 14 to 17 degrees via the two governors for ideal performance as speed increases, If either of these two governors are not working, then the car will be sluggish on acceleration and have little power on hills and will run hot and consequentially bum valves continuously.
To check the function, first remove the distributor cap, then disconnect the vacuum pipe line at the carburettor end. Add a length of small bore close fitting rubber hose tubing to the pipe line and suck on the hose, at the same time observing the rotational movement of the distributor points mounting plate. When you suck, the vacuum governor will pull the plate in the advance direction and it will snap back when the sucking stops. If, when sucking, you can not build up any suction, then the system can not work and there is a leak somewhere, ether in the pipe line or the governor diaphragm is punctured. Renew.
The mechanical flyweight governor is beneath the points plate, so it is necessary to dismantle the distributor to view this governor. However, if you remove the rotor button you will see a screw underneath it in the centre of the cam shaft. This is where a drop of oil is necessary every 4-5000 miles to keep the governor shaft free. Refit the rotor and thrust it back and forth in a rotary action and feel if the cam is free on the centre shaft and you can hear the bob weights clicking.
If it is seized solid then the distributor must be removed and overhauled. Until all this mechanism works correctly you are wasting time trying to time the engine and can cause damage to the engine.
If somebody else's Morris Minor goes better than yours, this is probably why. The engine is running retarded.
How to make the self cancelling device on the indicators work.
I have had 61MORI this has not worked and I thought it was just worn and I would
fix it " some day ". Well the day arrived because I failed a warrant
when there was too much up and down movement in the steering column and also free
movement as the steering wheel was rotated.