The sound quit working, here will be shown that the piston rings are stuck in the piston and will show the connecting rod bearing worn...
Piston rings... stuck
Connecting rod bearing worn
Crank shaft journal right side gone, left side good, you don<t see it but the block is cracked and need machining.
Head valves seats are shot, they need relapping. I have mesured the cylindre bore and it is not so bad, will need new rings and 1 connecting rod. crank bearing shot, need new one.
This engine is discontinued, so getting the parts is hard.