Somebody asked about the correct rotor position for an MGB.
Strictly speaking there should not be a "correct" rotor position and that
is why the Haynes manual does not describe it. The rotor can be in one on
several positions depending on how the distributor was inserted into the
engine.
The distributor has a drive cog at the bottom which meshes with the
camshaft. I think there are about 8 teeth on the cog, so theoretically
the distributor can be inserted with the rotor pointing in 8 different
positions.
What I like to do is have the rotor in all my cars pointing in the same
relative position (I usually have the rotor pointing to the number 1
spark plug at TDC)
To set the rotor in the correct position do the following :
Set the No 1 piston at TDC on the firing stroke.
Remove the dizzy cap and take note of the position of the rotor.
If the rotor is not pointing at a particular contact, loosen the dizzy
and rotate it until the rotor is pointing at a particular contact. This
should now be the position for the number 1 cylinder on the dizzy cap.
Connect the ignition wire to the number 1 spark plug.
Now go round and install the other ignition wires according to the
rotation of the rotor and the firing order.
gerry
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