Thanks for all the suggestions. I am leaning towards an injector(s) or the injector pump. A diesel is far simplier than a gasoline engine. All a diesel has is more/less fuel, more/less air.
When starting and idling it starts randomly knocking. This knock dosen't sound metallic. It sounds like a real heavy fuel knock like pre-detonation on a gasoline engine.
The only way this makes sense is that when running at higher RPMs, the injector is hosing it to it the cylinder and being burned. No smoke, no miss, well it has had a light miss for years... Idle down and it starts knocking like a MF'er.
If an injector were stuck, not seating, trash, broken spring it would be flooding that cylinder causing black smoke and a heavy spark knock? Could the injector pump be related? The injectors, pre-cups, and pump are all OEM from 1962, never touched in 47 years. Has about 5000 hours on the clock.
If it were a piston pin or sleeve I feel it would have gerenaded long before I ran it 3 hours yeaterday with a 6 foot cutter in 6 foot high weeds at about 2000 rpm. But it still acting up at idle.
I think I'll try removing the lines and turning it over. If I do that, I am going to have to bleed the system... What would it cost to overhaul 4 injectors.
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