[AT] 4020 troubles

[Barney Van De Weert]

If you run it, do you get bubbles in the radiator? Weep holes should be pretty prominent in the block at the base of the sleeve an inch or so above the bottom of it centered on the sleeve. I'd check everything out before tearing into it- I saw a so called Mechanic take a head off a 4520 because of the same thing and the problem was the oil cooler. I remember the weep holes more on 4010's at 79-80 they may have quit putting them in- Get a leak detector, pre-lubracator and pressurize the oil system and see what happens. 
Barney Van De Weert 

    On Monday, March 12, 2018, 6:31:58 PM CDT, John Hall <jtchall at nc.rr.com> wrote:  
 
 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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