Setting timing on 4010 diesel

The later pumps were timed to the engine at the END of the injection cycle, as fuel delivery stops, and the injector pintle reseats.

The later pumps IF they been kept original, and parts have not been swapped will likely say "Timed Injection End" right on the little timing window covers on the pump.

When I went to time my 4010 (of which I have posted so much of lately) I used an IT shop book. I knew I was only off a little and was surprised when at 14 degrees there was no sign of a timing mark. At 0 degrees the mark was visible. I called the local John Deere dealer and he told me a 4010 deisel should be timed at 0 degrees. Hopefully someone else can verify that the John Deere shop manual says 0 degrees.

Hope this helps

John

Worked my cheeks off trying to get that tractor to run right, start and all and couldn't make any progress. Had 2 of the local experts out and they just scratched their heads....everything they usually found to be the problem wasn't. Nobody thought to check the timing.

In short, I reread the manual and this time discovered the overlooked sentence. Set the timing properly and no more problems.

Don't know about the diesel, but if it doesn't want to crank and run, might look some more. TDC makes for a sluggish engine (any engine) if you have nothing to advance the spark/fuel injection timing. I know of mechanical advance on the distributor of gas engines to do that. Don't know what an injector pump would use if anything.

You have to get the bang started before the piston hits the top so that it has had time to get there when needed. Even with a diesel, where you want a cylinder full of hot compressed air then "squirt" it still takes time for the injector pump to know it's time to squirt, squirt, get the fuel to the injector, and the injector to squirt it..... the whole time the crank is still turning; piston is still moving. TDC seems a bit late.....but I dunno.

Food for thought.

Mark