[AT] 4020 troubles

[Dean VP]

John,

 

I don't think you are running into an uncommon problem.  Being a replacement
engine the documentation may be very poor. John Deere is usually pretty good
at documenting things from the factory but after that is gets a bit dicey.
Changes made at the dealer may not be documented at all.  Good luck.  A 4020
is well worth restoring. 

 

Dean VP

Apache junction, AZ

 

From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Mitchell Daly
Sent: Monday, March 19, 2018 5:21 PM
To: Antique tractor email discussion group <at at lists.antique-tractor.com>
Subject: Re: [AT] 4020 troubles

 

John,

 

You've got a big, dirty task in front of you. Good luck with all of it and
hopefully you won't find anymore problems.

 

Mitch Daly
md31043 at msn.com <mailto:md31043 at msn.com> 

 

  _____  

From: AT <at-bounces at lists.antique-tractor.com
<mailto:at-bounces at lists.antique-tractor.com> > on behalf of John Hall
<jtchall at nc.rr.com <mailto:jtchall at nc.rr.com> >
Sent: Monday, March 19, 2018 8:14 PM
To: Antique tractor email discussion group
Subject: Re: [AT] 4020 troubles 

 

A bit of an update on the 4020 water in the oil situation. I kept 
searching for the leak and only found it on #6. Appears coolant was 
coming in on both sides of the sleeve. At this point it doesn't matter 
if it was a bad sleeve or head gasket (hopefully no cracked head) in 
addition to a bad O-ring. Doing an in frame rebuild. Ordered a kit from 
Abilene machine along with new injectors and a water pump. Head and 
manifolds went to the machine shop to be reworked. Crank is actually 
still standard--nobody can say for sure if a new crank was installed 
when the replacement block was put in about 5000 hours ago--don't 
remember about the head either. I will say having a replacement block 
and the head to match has made this an oddball machine to work on 
(ordering parts). I am quite surprised at Deere's inconsistency on this 
engine. I still have to get 5 pistons and all the sleeves out, then I'll 
begin cleaning things up. Thank God for smart phones, been taking lots 
of pictures. There is a ton more parts to pull off this than the average 
gas engine.

John Hall
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