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How can you tell when number 1 piston is up?

Will not start acts like there is no fuel. It has a new injector pump. Would start a first using ether and will fire now using ether. Will injectors or glow plug cause it to act like this?

Have a NH TN75 that the oil pressure light stays on. Just changed the oil and filter but it has not changed anything. It flutters and may go out momentarily but comes back on. Bought this tractor used and really like how it performs until this issue came up. Has anyone had this problem? Would...

I bleed the injectors and get air. The tractor will then start but only run for 10 to 15 minutes. I bleed the injectors again and get air. Seems to be sucking air from somewhere but I cannot figure out where. Any ideas?