greenmachine
Member
I have a 1975 JD 4630, that I bought many many years ago. It has always had light white smoke when running, worse when cold, but still visible when warm. I had the injection pump and injectors rebuilt last spring, still smoked the same. They put new plungers in the pump and new nozzles on the injectors. It did make it start better in the cold weather. This spring I decided to do a complete overhaul as a rod bolt came loose when spraying. I caught it in time and it did no damage. The head was completely redone, new valves, seats, guides, springs, etc. I installed a new camshaft, lifts, oil pump drive shaft. I put a new crankshaft balancer on at the same time. Basically anything that needed replaced got replaced. It had a turbo, water pump and radiator replaced last fall. I set all the valves and timing correctly using all JD tooling, pinned the flywheel etc. It starts really good now, but still has white smoke at idle. It clears up when it gets under load, but even when hot idling it smokes white. No oil or coolant consumption. Its for sure unburnt diesel fuel. I have double checked pump timing, set the valves again, they were fine. I have a 4430, it does not smoke at all. I am wondering if it still has a pump problem, or do I need to play with pump timing? I just feel it shouldnt smoke once warm at all. I had a good pump shop do the pump and injectors so I think they would be right. Not sure what else to check.. Or is were some 30 series like this? Thanks!
