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John Deere Tractors Discussion Forum
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Setting timing on 4010 diesel

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hogman_2002

02-10-2005 20:54:47




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I have a 4010 diesel with a 4020 rebuild kit. I was wondering where do I need to set the injection pump? The I T manual I have says to set it on 14 degrees Before TDC for a 4010. But to set it on TDC for a 4020. So that got me to thinking. The injection pump is a Roosamaster with the fuel advance.




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msb

02-11-2005 08:33:26




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 Re: Setting timing on 4010 diesel in reply to hogman_2002, 02-10-2005 20:54:47  
A 4010 with a speed advance kit in the injection pump is to be timed at 8 degrees.Use the timing window as a measure to mark the flywheel.Since the full width of the window is 4 degrees,scribe a line on the flywheen below the 10 degree mark using 1/2 of the width of the window to come up with 8 degrees.Should a 4020 govenor weight retainer have been installed then time the tractor at TDC.Lots of misinformation below.Alll rotary distributor pumps are timed at end of injection and all in line pumps are timed port closing.In both cases that is the only constant.

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Bob

02-11-2005 06:52:31




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 Re: Setting timing on 4010 diesel in reply to hogman_2002, 02-10-2005 20:54:47  
The reason for the discrepancy is that the original pumps were timed to the engine at the START of injection... when the pump first begins to deliver fuel and "crack" the injector.

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.

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R. John Johnson

02-10-2005 22:42:31




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 Re: Setting timing on 4010 diesel in reply to hogman_2002, 02-10-2005 20:54:47  
Hogman

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

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jdemaris

02-11-2005 05:47:49




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 Re: Setting timing on 4010 diesel in reply to R. John Johnson, 02-10-2005 22:42:31  
It's been a while since I worked on a early 3000 or 4000 series Deere - but . . . as I recall, the static timing issue - of 10 or 14 or 0 degrees before, or at, top dead center ALL related to the injection pump. You need to go by the spec. numbers on the pump itself. If in doubt, call a pump shop with all the numbers. We either sent pumps out, or rebuilt a few in the shop that got updates relating to the fuel timing automatic advance and/or scribe marks on the governor weight retainer. These are the marks you see and line up when looking into the injection pump timing window. Changes, sometimes including an entire different pump model, are reflected in the spec. numbers. Modified/updated pumps got new - or additional numbers.

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txblu

02-11-2005 05:29:12




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 Re: Setting timing on 4010 diesel in reply to R. John Johnson, 02-10-2005 22:42:31  
Rebuilt a 4020 LP. IT manual said go to 0 degrees and do this and do that. Later on it said set timing to 25 BTDC. I missed that sentence.

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

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