Glow plugs replacement

Biggest issue with glow plugs is breaking them off in the head. I spray them down with Kroil and then run the engine up to temperature. Then let it cool just enough that you can get the various items off or out of the way and use a 1/4" ratchet and long socket. It helps to limit the torque you can apply when removing them. Be sure to remove them as fast as possible, then ream out the carbon and install the new ones. If you let the engine get cold you will have a fight getting them out.

i could only see the one cylinder number one , cylinder two to four are behind something i am not sure what is .

Take a couple pictures and put them on here. We do not get this particular engine in the US, but a couple good pictures should help. Another thing may be to use a mirror and see if you can spot them under the item in the way.