135 blowing oil

   / 135 blowing oil #1  

Jessef87

New member
Joined
Nov 15, 2025
Messages
2
Tractor
Massey Ferguson 135
I have a 135 Massey Ferguson diesel that acted like it ran out of fuel and quit and won’t start back off starter but will if you pull start it but then it blow oil out of dip stick tube. So we took crank case breather tube off valve pan and it was not stopped up so we tore it on down and the head and piston also the sleeves all look good what else could it be it runs great and sounds good when you pull start it just blows to much oil out of dip stick tube to run it
 
   / 135 blowing oil #2  
Sounds like you've got some serious blowby, did you check the head gasket..?? Could be blown between cylinder and oil return ports.

Did you pull the dipstick to see how much oil is in it..?? Injector pump may have put a lot of diesel fuel in the crankcase, and running pushes it out. That much the oil should smell like diesel.
 
   / 135 blowing oil
  • Thread Starter
#3  
I checked the oil it doesn’t smell like diesel
 
   / 135 blowing oil #4  
There are only two things that will make it blow oil out, to much oil in the crankcase usually caused by the injector pump dumping fuel into it or compression from a blown head gasket, cracked head or worn out rings and sleeves.

Have the head checked by a competent machine shop for cracks or being warped. Look closely at the old head gasket for signs of a blow out. IF all these check out then most likely you have broken rings allowing the compression in passed the pistons. Which I am guessing is the problem since you say the only way to start it is to pull it and to me that equals low compression.

Did you think to take a compression test before tearing it down? That could have told you a LOT.
 
   / 135 blowing oil #5  
I don't know the 135 but if the hydraulic pump fails on many tractors it will dump hydraulic fluid into the crankcase. You may not notice a drop in the hydraulic fluid level but you generally have far more hydraulic fluid than engine oil and you will see it on the crankcase dipstick.
 
   / 135 blowing oil #6  
Seconds on the post about hydraulic pump....if the front seal blows it goes right into front timing gears and then down into oil pan...and the pressure blows out breather cap or filler...
 

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