PMS in compression or escape?

It is very easy, if you have the cylinder, for example, the No. 1 in PMS and in your engine as Decis is 1 and 4 you realize which one is in compression looking at the camshaft, so that it is in compression the 1 you should put the cylinder 4 at "crossing" that is when the valves are tendering to close and the other starting to have had. That is to say, the balance makes them precion at 2 ahi is when the 1 is in compression and the easiest if your engine is gasoline to take out the spark plug and put your finger in the hole of the same, tour the engine with a tool and when you feel that the piston pushes your finger for the compression there is when it is in time of compretion. I hope I explained.

In this case, the PMS of the first cylinder is important but beyond that, the most important thing is at what point are the valves of that cylinder, what happens? The valves of the first cyl should be closed, why? Because the time of the first cyl must be in PMS in compression/explosion, when turning the tree should continue escape in the cyl, it is important to be clear in this when the marks are lost. Good that you already solved, this is for those who read your consultation.