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John Deere Tractors Discussion Forum
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Re: 2020 Diesel Timing

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12-23-2013 05:39:03

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The timing is supposed to advance by 14 degrees when running. Subsequently - if the advance isn't working it will be impossible to manually adjust timing correctly by moving the pump. You can get the timing correct at engine idle speed, or a high RPM - but not both. Generally speaking - if the advance is not working as it should and timing is retarded at higher RPMs - the engine will skip when you try to rev it under no load. Might smooth out when worked.

That's why I mentioned the little round plastic timing window. It has circular degree lines. It makes a 10 minute job out of checking the full timing curve from 0 to 14 degrees just by screwing it on, running, and looking.

As others have mentioned - the pump itself has a timing pin hole, just like the engine does. All that does is verify the pump is static timed when the engine is cranking and has nothing to do with ensuring proper timing when the engine is actually running. If the pump has a non-working advance and you set it properly with the timing pins - it will be running 14 degrees retarded when running at high RPM.

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1 Dollar

12-23-2013 07:13:26

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 Re: 2020 Diesel Timing in reply to jdemaris, 12-23-2013 05:39:03  
Ok thanks for the directions. I think I did the pins when I first installed this thing but I'll check that again for sure. My main concern is just the smoking at idle. It runs fine everywhere, the smoke just burns your eyes and I know it's not burning all the fuel.
Is there a way to dynamically time it?
Where could one go about getting one of these windows?


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12-23-2013 17:41:28

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 Re: 2020 Diesel Timing in reply to 1 Dollar, 12-23-2013 07:13:26  
Deere used to sell the window under a Deere part # that has been obsolete since the 1980s. The Stanadyne part # for the round plastic timing window for C pumps is # 17180. Thompson diesel was selling them for $8 each but I suspect they are all gone. I bought a spare last year from them. Other dealers charge around $25 for it.

The round plastic window has degree lines in circles. You screw it onto the pump and then start the engine. Rev it up and look into the window to see if the timing changes. Very easy to do and with Deere spec pumps - you can adjust the timing advance with the engine running.

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