1. Stop the compressor and take out the fuse
2. Drain the cooling water
3. Remove the cylinder cover
4. Clean the cylinder head face and piton crown
5. Place the led metal piece on the top of the piston
6. Cylinder cover is placed on the cylinder with correct joint thickness and tightness the head
7. Turn the compressor slowly by hand over the engine and head impression
8. Then remove cylinder cover again
9. Remove the compressed lead metal
10. Take the measurement of lead wire thickness by using micro meter