Engine knocking

[Ben]

If its the earlier type of engine the correct torque is crucial to drive the oil pump. If its the later type its key wayed so has less of a chance of slipping

Surely none of the engines have a cambelt crank pulley without a key? If it slipped at all the timing would be out and the engine shagged..

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the oil pump drive sprocket on the crank on the later engines was keywayed
early engines relied on the clamping force of the crank bolt to stop the oil pump drive sprocket spinning as it didnt have a keyway

Ah I thought we were talking about the cambelt pulley not being keyed. Still I can't get my head around how the pump sprocket could be held by that bolt rather than a key, I'd have to see a diagram!