[AT] 4020 troubles

[k7jdj at aol.com]

John,

I have never had any luck with stop leak, IF the leak is into the combustion chamber.  You can see if it is leaking there by taking off the radiator over flow hose and put it in a pail of water while the engine is running. Some air bubbles are OK but if the bubbles increase with engine RPM you may as well plan on pulling the head. Oil cooler failures usually push oil into the coolant.  I have also found that if the engine is not loaded a fair amount the leak may not cause any issues.  In almost every failure I've had the first sign of trouble was rust and moisture at the top of the oil dip stick. Most of my experience has been with Detroit Diesels and John Deere diesels.

Gary,
Renton, WA.  


-----Original Message-----
From: charlie hill <charliehill at embarqmail.com>
To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
Sent: Tue, Mar 13, 2018 2:27 pm
Subject: Re: [AT] 4020 troubles

re-torque the head, put some good quality stop leak in it,
run it and see what happens.  All it will cost you is a 
couple of hours and the cost of the stop leak.  Won't hurt a thing.

Charlie

-----Original Message----- 
From: John Hall 
Sent: Monday, March 12, 2018 6:42 PM 
To: Antique tractor email discussion group 
Subject: [AT] 4020 troubles 

Haven't seen anything from ATIS in days. So here is a little something 
for you guys to ponder. Spring is upon us and needed to get the 4020 
Deere diesel serviced. I pulled the drain plug slowly and noticed 
antifreeze coming out instead of oil. I caught about 4-6 oz of 
antifreeze before it switched over to all oil. Pulled the pan and 
pressurized the coolant system. Number 6 has oil coming between the 
piston and sleeve--out side of sleeve looks dry (makes me think the 
orings on sleeves are OK). I have not had the engine hot and antifreeze 
is adequate, so I have no reason to suspect a crack. I really don't have 
time to do an in frame rebuild right now, just considering a head gasket 
replacement--should face head as soon as I can find someone who can. 
Supposedly this engine has weep holes in the side of the block, but I 
haven't found them.  the block is a replacement from 79 or the very 
early 80's. I am not ruling out a in-fram rebuild, would just like to 
wait until next winter if I can.

Your thoughts?

John Hall

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