was just wondering if anyone else has had problems with the cast woodruff key snapping on there cam pulley? have just put an ARZ head onto my AJQ engine and the timing marks were out (bottom end lined up but cams were out,they would have snapped on pistons when we tightened up head), so we duly took off the old pulley to find the key had snapped, hence why the valves had struck the pistons. the new (second hand head) was the same, was broken also but had not slipped round far enough to damage valves as they were all fine with no marks to indicate otherwise. I have a new pulley coming monday so should be up and running then (piston damage was minimal so will be fine).
The old head, when we stripped the cams off, had had a sludge problem(oil pressure, pickup pipe blocked) and the exhaust cam had run dry and had worn into the head so pressume this caused the key to break but if anyone else has suffered the same then let me know and what caused it?
will post pics of old and new when daylight arrives