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[Richard66]

I am getting Diesel fuel in my engine oil. Any ideas?

 

[DanielW]

Common, very, very common on the Bosch PSB pumps. On the side of the injection pump, there's the feeder/lift pump built into it. The shaft seal inside it goes bad. Easy to fix/replace: Pop the cover off, slide the pump gears out, replace seal, put back together.

The seals are SKF Part Number 4231, or Timken/National Part Number 444258. There are a few others which interchange as well, but those are the two most common. Any bearing or industrial supply worth their salt can get them in. Last ones I got were SKF, bought them a couple of months ago for $16 each. I only needed one, but got two just in-case I bungled one up putting it in. Still have it (somewhere), if you're anywhere near central Ontario you're welcome to it.

 

[DanielW]

Apologies: I was misremembering: You don't need to pull the cover off: The lift/supply pump has six screws in it: Two centred top & bottom which hold the pump on, four which hold the cap on. You just need to take the two centred top & bottom ones out and slide the whole pump out to get access to the seal - no need to take the cover off. Original Bosch part number for the seal is PK7910, but you're far better off buying the SKF/National/Timken one.

 

[DanielW]

See circled items in picture below:

 

[Richard66]

Thank you for your help. I have IT manuals for every other pump except this one.

 

[Watthour]

...Sel.

If it's diesel, it's going to find a place to leak/seep/wick/drip sooner or later. That's not always a bad thing.

 

[Richard66]

I have owned this Tractor for 20 or more years and have never had any issues with it until recently

 

[Dieseltech]

The American Bosch gear pump seal is PK 7910. There's also a chance if fuel still gets into oil after seal is replaced that the hydraulic head seals need replaced too. They get hard/brittle over time and will pass fuel into oil also at the lower head seal, control unit seal, and/or the lube oil bolt seal.