So in the next week I'm hoping to check my tappet clearance and I also want to check the condition of my rockershaft as Im getting a bit of knocking as I come areound the 230k mark. So my question is was is the formula / crank order to set the tappets in the correct position to measure their clearance? I've got and aftermarket turbo and wondering will I need to compensate for that when adjusting the clearances?

and as for the rocker shaft, what should I be looking for in terms of wear and tear?

cheers, Dylan.

BTW, its a '92 GQ Silvertop TD42