John Deere 425 Blowby

   / John Deere 425 Blowby #1  

a.palmer jr.

New member
Joined
Jul 12, 2007
Messages
12
I have a John Deere 425 tractor that's got a severe case of blow by. It blows the dipstick and the oil cap off of it. I was told to change the pvc valve behind the flywheel, which I did but I don't think that fixed the problem because the old valve, which looks like a reed valve, looks as good as the new one. I checked the compression and it showed about 170 on both cylinders but seems like the last time I checked it it was lower on the left side by a few pounds than the right. Is there anything else I should check while I have the engine out of the tractor?
 

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