Uboat wrote:So I put the pulley mark at 12 degrees to tdc, then rotor was six o clock which is in the middle between cylinder one lead and next cylinder lead. So I turned the distributor 45 degrees anticlockwise to get spark in cylinder no 1, then tightened clamp. But the spark was at the same timing! What did I do wrong?
Ulf
Not sure if that would work. you have to get the rotor arm in the right place first. If you have removed the cam sprockets since it last worked, when you replaced the timing chain it might not now be on the same teeth of the shaft that drives the distributor.
So you may need to unclamp and lift up the distributor, them rotate the rotor arm to near the correct position, then slide the distributor in. When the spiral gear at the bottom of the distributor meshes it causes the rotor to move a bit, so you may need a few attempts to get it in the right place relative to spark plug 1's contact in the distributor cover.
If you look at the rotor arm you will see that it has a long curve on the high tension side that gets close to the spark plug contact, that long curve copes with the automatic advance i.e the tiny spark between the rotor arm and the HTlead contact will move along that curve as the RPM increases. So at static timing measurement it has to be one of the ends of the rotor arm contact that is near the HT contact. Of the top of my head I'm not sure whether that should be the leading edge or the trailing edge of the rotor contact and it is a bit mind twisting to try work it out. It's usually quicket to just try both ways
With the simple rotor arm (the one that does NOT have the centrifugal rev limiter built in), the curve of the contact on the rotor arm is quite long, so it is probably OK to just ensure that at static timing point the No 1 contact is near the centre of that rotor contact.
The distributor cam has only 4 lobes, but I think the spiral gear may have 8 or 12 teeth, so for each good position of the spiral gear there are one or two positions that are not right.
Looking at that picture, I count 10 teeth on the spiral gear.