Thank you very mauch for your advices. I'll try to do as you said and see what happens. Shoul I use 10% NM to do the adjustment instead of the 5% NM that I used last day?. Till now the engine worked ok with the 10% NM.

How can I check if the glow plug is still ok?. I have taken it out of the engine, connected directly to the starter and it seems to get incandescent normally. But I still have the doubt about why the engine stops when I take out the glow plug starter.

Greetings