number 4 cylinder would be compressing but gasses would be escaping enough not to be a problem

oh yeah, what was i thinking
of course if the injector is out no compression, it wont be hard
DOH!
thanks L1ftmech heheh

Well, it wont be hard to turn if the injector is out because there will be no compression, but it is true that both valve rockers will have slight clearance at TDC Compression stroke, if the valves are adjusted properly.
If you can find the point at which your probe wire stops rising (exactly stops) and then the point at which it begins to descend again, and then split the difference between those two points, you will be exactly at TDC.

best way to find TDC is to just pull out the injector on #1 and get a stiff wire or something that you can stick down in the hole...
rotate the engine till the piston is at the top of it's stroke...
Just make sure it is on the compression stroke
you will know because it will be hard to turn usually
also the rockers on the valves will be relaxed on that cylinder(valves closed)

Thank you for all that. The only thing that has been done is injection pump removed, rebuilt, and replaced. On the crank pulley, there are markings. It appears to be 0 1 1 1 1 1 1 1 1 0, using the 1's as lines. Not sure, how to determine TDC according to these marks. I have rotated the pump in the direction of engine rotation several times hunting what I need, however, I don't detect much change. As in the engine starts, heavy fuel smoke, lazy(as in retarded). Even if you attempt to change the angle of the pump while engine is running, it is hard to detect any significant change in the performance of the engine. Again, the pump has been rebuilt by a very reputalbe enity.

(1) Remove the gear case cover
(1)Use socket and put on crank gear nut and turn engine (clockwise) till #1 piston is on TDC on compression stroke.
(3) Inspect the gear timing marks
(4) There will 3 marks on the idler gear that will align with the cam gear, the crank gear and the injection pump gear. (there may be one on the oil pump and aux drive gears also but if not disregard them as they will not matter on their position)
(5) Of those 3 marks they may be labeled 11, 22, and 33 or 1, 2 and 3. mark 1 goes toward the crank gear, mark 2 goes toward the cam gear and mark 3 goes toward the injection pump gear.
(6) Check the mark on the injection pump mounting flange and make sure it is aligned with the marks on the mount plate flange, if there are 3 lines align it with the center line.

Once all the marks on the gears align up the engine and injection timing is set.

reinstall the cover

Now if you have not disturbed the cam and crank gears and have just replaced the injection pump just make sure the engine is on the TDC on compression stroke and use the timing mark 3 on the idler gear and set the injection pump gear mark on it. Also make sure the outer mark is aligned with the center mark on its flange against the flange mount plate.