What has to be done to repair an engine that has suffered from a snapped belt/chain?
A. The cylinder head has to be removed from the engine block and the valves are stripped from the head. The valve guides are inspected for cracks and replaced if necessary. The damaged valves are replaced and the cylinder head is rebuilt fitting new valve steam oil seals. It is then fitted back onto the engine block using a new head gasket and timing belt / chain.