four-stroke-cycle-engine

So here is a four stroke engine cycle, with each stroke listed. Hopefully everyone understands it, but if you don't, google.
What is important is that each stroke is 180 degrees, or half a rotation. When you look at the picture just think about the front of the engine photo with the arrow on the crank pulley. Right behind the pulley, inside the engine in cylinder No. 1, this is what is happening. So if you knew where the cycle started you could look at the arrow on the crankshaft pulley and know where you were. It would go around twice for every cycle. But how do you know where the cycle starts??? Well, the cycle starts with an intake of fuel, so the No. 1 cylinder intake valve will be down (like the number three intake valve in the valve photo) As you rotate the engine (I use a wrench on the crankshaft, but if the engine fires it could be LETHEL - when I did it the fuel was all drained from engine and there was no fuel injection pump) you will see the no. 1 valve go down, telling you the intake stroke is occurring. If you keep rotating both valves will be shut, and then the exhaust will open, ending the cycle. (see diagram)
When you have rotated about one rotation and both valves are closed you will be near top dead center. Now you have to locate the timing marks on the flywheel (on my engine) and adjust flywheel (which adjust the crank, which times everything) to the specified number of degrees before top dead center. geeze, I am getting worn out. be back later.
All of the above has been so that I could insert my rebuilt fuel injection pump in the correct timing so it would not inject fuel at the wrong time.
Another closely related topic is the initial setting of the valve clearance. The valves make a tight seal on the valve seats when they are closed, and open the correct amount when they are supposed to be open. To start your engine after rebuilding you need to set the initial clearance for when the valves are open ( .014 to .016 - for my engine- using a feeler gauge from auto parts store) The information below the cylinder head top view tells you what valves are open when you should be setting other valves. If all of this is fuzzy it is because it is just to much for me to explain. If you have my engine and have questions just drop me an email. I am not a professional. I am a self taught who is only sharing what he has learned. Maybe right, maybe wrong.