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John Deere Tractors Discussion Forum

4020D running

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David G

04-04-2013 20:37:31

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We got the 4020D running tonight, only a couple of small leaks that are fixed now.

The engine has the enhanced compression pistons in it. We set the timing at 10 BTDC, but it loped a little at idle, and really sounded like it wanted to detonate, so backed that to 5 BTDC and it quieted right down and the idle smoothed out.

Have you seen that much difference in timing between standard and enhanced compression.

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David G

04-05-2013 05:41:52

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 Re: 4020D running in reply to David G, 04-04-2013 20:37:31  
It did really sound peppy at 10, but will it crack or burn pistons?

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Tim S

04-05-2013 06:20:20

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 Re: 4020D running in reply to David G, 04-05-2013 05:41:52  
No it will deal with it just fine, and will also be okay where you have it, sounding nice, but not as "peppy"...I'm only talking by a few HP's, but if you were playing on the dyno it would be noticeable...

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David G

04-05-2013 08:23:46

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 Re: 4020D running in reply to Tim S, 04-05-2013 06:20:20  
I think we will get through planting with it set at 5, then look at advancing it, maybe to 8 and see how it goes.

It really snaps at 10 when you advance the throttle.

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04-05-2013 05:13:33

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 Re: 4020D running in reply to David G, 04-04-2013 20:37:31  
I've rebuilt several 404's with the high ring pistons. Have had the heads flat surfaced,valve standout set to spec, timing at factory spec, no pump mods. Most noticeable improvement is in cold weather starting,and less exhaust smoke when cold. Last 4230 I did stared at 18 degrees not plugged in with no ether,without alot of crsnking

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Tim S

04-05-2013 05:59:26

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 Re: 4020D running in reply to MSM, 04-05-2013 05:13:33  
When the 4230's came out new that was a killing point for them, they started hard, Deere went through a couple different injector change campaigns none realy helped much..

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Tim S

04-05-2013 05:01:20

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 Re: 4020D running in reply to David G, 04-04-2013 20:37:31  
A smooth quiet sounding 4020 will be "Spanked" by a 4020 with a little ping in the engine as it reves up, which is caused by the 10-15 BTDC setting,, but you will be fine where you have it set now..

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Mike Aylward

04-05-2013 10:37:15

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 Re: 4020D running in reply to Tim S, 04-05-2013 05:01:20  
Tim is right. Factory timing is at TDC but I've always set the timing at 3-5 degrees fast and on a particular tractor doing nothing else but this gained 10 h.p. The owner didn't believe it. I've never tried 10 degrees (mostly because the tractors I've set forward didn't have that much slot to do it) but I imagine it would be fine. A quiet 4020 is usually a good runner...and a pooch. Mike

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Tim S

04-05-2013 11:07:00

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 Re: 4020D running in reply to Mike Aylward, 04-05-2013 10:37:15  
Ooh yes Mike you can feel it when the rev up...

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Tx Jim

04-05-2013 04:08:37

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 Re: 4020D running in reply to David G, 04-04-2013 20:37:31  

Didn't you install a new oil pump or pump shaft? Did you install a new cam? If so this would have tightened up the timing of the inj pump back to new spec's.

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