I had a knocking noise coming from the engine the other week. Thought the worst
, big end failure, cam shaft failure or something else along them lines. Turned out to be the balance belt had snapped and the crank shaft had jumped one tooth. Replaced the belt, reset the timing and all was well
. So new belts, pulley, tensioners and a few other bits ordered, now just waiting for postman pat to deliver all my stuff. So I would take the cam belt top cover off and have a look first.