4020D running

David G

Well-known Member
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.
 

David
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.
 
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..
 
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
 
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..
 
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...
 
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.
 
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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