401 Fuel in oil

Largecar · Jul 22, 2020

I have a 401 that is getting fuel in the oil is this a common problem?
How big of an operation to repair?

Don Rudolph · Jul 22, 2020

More than likely it is the small seal in the transfer pump on the side of the injection pump. Just did one 2 weeks ago on a 400 Super. It's about a 1 hour job for a novice and requires removing several lines and reconnecting them, which is the worst part of the task. Don

tomturkey · Jul 22, 2020

I had that issue also on my Case 400, sent the pump to dieseltech (a contributor to this forum) and all has been well since. Getting the injector lines off the pump is a challenge. I was very paranoid about marking the locations of everything so I could get it back together correctly. Guess it payed off all went well. gobble

Largecar · Jul 22, 2020

That sounds like a plan - how do I get ahold of him?

John Saeli · Jul 22, 2020

Dieseltech is a great guy, but what a waste of time and freight to R&R a pump for an $8.00 seal you can change yourself in less than an hour. kind of like pulling an engine to replace the spark plugs.

tomturkey · Jul 22, 2020

John, I've attempted simple fixes and suddenly been up to my butt in alligators so to speak. A spring jumps out, or a tiny silver ball falls out, never to be seen again. That injection pump according to things read on this site no longer has parts available. So understanding MY limitations and paranoia thought it best to send it away. Thank you for your service to the CASE community, I/we appreciate you and Chris. gobble

Dieseltech · Jul 22, 2020

As others have said, start with the gear pump seal, PK7910 or equal cross. Gear pump will pull out with the two bolts removed and needed lines off. If fuel still gets into the oil then the injection pump seals are next suspect.

Doc Larry · Jul 23, 2020

As others have said, the transfer pump seal is the best place to start, and you won't find a much simpler repair.

John Saeli · Jul 23, 2020

Tom: This really is a simple fix. We keep the seals in stock and sell dozens a year. If one has the expertise to R&R the pump, then one has enough expertise to replace that seal, and in less time.

401 Fuel in oil

Largecar

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Don Rudolph

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tomturkey

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Largecar

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John Saeli

Well-known Member

tomturkey

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Dieseltech

Well-known Member

Doc Larry

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John Saeli

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