2520 diesel blowby

bv

Member
I have a 71 2520 diesel that starts easy and runs great and doesn't smoke but it has a lot of blowby and a little bit of oil is coming out of breather pipe, I bought the tractor last fall and haven't got to use it any because of too many other projects so maybe some broken rings or what?
 
I had a 2520 that did the same - oil & water came out of the breather. In my case it was cavitation of the block so the liners wouldn't seal because the coolant hadn't been kept up. Good place to start is get some coolant test strips and check the antifreeze.
 
Regardless it is a good idea to test the coolant in terms of pH. I've seen some tractors that have significant blowby but use a minimal amount of oil over a workday. I would put it to work and frequently check the oil level over the course of a day. See if the blowby increases as the job becomes heavier.
 
Regardless it is a good idea to test the coolant in terms of pH. I've seen some tractors that have significant blowby but use a minimal amount of oil over a workday. I would put it to work and frequently check the oil level over the course of a day. See if the blowby increases as the job becomes heavier.
that sounds like a good plan, I just didn't want to make matters worse.
 
Could be ?
 

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that sounds like a good plan, I just didn't want to make matters worse.
Just remember that it may take an hour or so for all the oil to drain back into the crankcase. Patience and vigilance are important while you do this.
 
If it starts good on a COLD "first-thing-in-the-morning" start, I wouldn't sweat anything just yet. Be damn sure the radiator is FULL, because if it's a gallon low on coolant, that might be getting into the oil and will make heavy blow-by in the form of steam. Remove the oil fill cap and inspect the underside of it for shaving cream like foam. If that is present.....that means antifreeze in the oil and leaking sleeve O-rings.
 
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If it starts good on a COLD "first-thing-in-the-morning" start, I wouldn't sweat anything just yet. Be damn sure the radiator is FULL, because if it's a gallon low on coolant, that might be getting into the oil and will make heavy blow-by in the form of steam. Remove the oil fill cap and inspect the underside of it for shaving cream like foam. If that is present.....that means antifreeze in the oil and leaking sleeve O-rings.
or electrolysis has eaten a hole in the sleeve deere is known for that problem on the smaller engines
 
If it starts good on a COLD "first-thing-in-the-morning" start, I wouldn't sweat anything just yet. Be damn sure the radiator is FULL, because if it's a gallon low on coolant, that might be getting into the oil and will make heavy blow-by in the form of steam. Remove the oil fill cap and inspect the underside of it for shaving cream like foam. If that is present.....that means antifreeze in the oil and leaking sleeve O-rings.
oil is clean anti freeze is full and clean no milky foam anywhere
 
I have a One-Eighty gas that I found a under a shade tree that has been there 10+ years. I assumed the engine would be stuck but as it turns out it wasn't and a quick carburetor OH and she runs nice !! So, now I'm dealing with the damage of outdoor life, like new brakes on both sides and cleaning out the mice nests. My wife says "why do I make myself do things like this ??"
 
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