Hi Guys,

I tried this thread on the Cosworth general forum but did not get a response and wondered whether anybody here could give me some advice.
I have seen query on the forum previously about setting up the camshafts for belt replacement and difficulty with alignment of the pulleys in accordance with the manual. My 4 wd head has been skimmed, valves ground in and a new set of Burton hydraulic lifters fitted. The car has vernier type camshaft pulleys fitted which I have set the centre to simulate the original pulleys. The exhaust cam can be set so that the 'arrow' lines up with the top of the head casting no problem, although it tends to creep back. The inlet cam, however, springs past this point clockwise by a tooth or so and can only be aligned by turning it back with a wrench and holding it against quite considerable pressure. The turning moment past the Ford manual set point seems to be caused by the spring pressure of the opening of the valves on No. 3 cylinder as the camshaft lobes slip off the edge of the tappet and the cam cannot 'rest' at the correct set point. The situation occurs at every 90 degree turn of the camshaft whether the head is off or on the car, so it does not seem to be particular to any one pair of valves or cam lobes.
Previous comment on the general forum seems to say that the belt can be installed by holding the pulleys in the correctly aligned position with a wrench, but this does not seem to be right somehow and I am worried about getting the cam timing right.
Does anyone have experience of this problem and what causes it?
Any advice would be much appreciated