D47U Fuel in oil

Most common source is an o-ring on a ferrule between fuel injection pump housing and filter tower. 8B4967 I think
It will look like some special triangular section seal but it’s not, just an o-ring that’s taken the shape of the cavity it’s been compressed into for the last 50 years. Earlier models have a second one on a plug used to block the opposite end of the fuel gallery on the governor end.

The fuel lift pump has two conical packings on the shaft with a spring expander between them creating a drain space that has a small tube attached to carry any leakage off the lower left front corner of the engine. So unless the tube is blocked to prevent it draining, it’s not likely to cause your problem.

[quote="ccjersey"]Most common source is an o-ring on a ferrule between fuel injection pump housing and filter tower. 8B4967 I think
It will look like some special triangular section seal but it’s not, just an o-ring that’s taken the shape of the cavity it’s been compressed into for the last 50 years. Earlier models have a second one on a plug used to block the opposite end of the fuel gallery on the governor end.

The fuel lift pump has two conical packings on the shaft with a spring expander between them creating a drain space that has a small tube attached to carry any leakage off the lower left front corner of the engine. So unless the tube is blocked to prevent it draining, it’s not likely to cause your problem.[/quote]

Thanks, I have full filter kit and a set of injector tips to replace at the same time I will see if I can find an o ring to fit.
Mark

[quote="big harold"]Thanks, I have full filter kit and a set of injector tips to replace at the same time I will see if I can find an o ring to fit.
Mark[/quote]
From Cat 8B4967 seal [o-ring]

i think it is a common oring. can be purchased at any part store for pennies.

Thanks Magnet for clarification.

That's a dash 318 o-ring buna-N common o-ring

He's going to need gaskets and who knows what else once he opens it up, he should get a parts book and service manual and go from there and get all the parts from Cat.

He's going to need gaskets and who knows what else once he opens it up, he should get a parts book and service manual and go from there and get all the parts from Cat.

Mark, I had the same problem a few years ago with my D47U. If you do a search in the upper right corner you can find several posts that talk about this along with a few pictures. I did not have much experience with these old CATS and still do not, but it is not a real difficult job to do. I got all my parts from cat. There are two O-ring seals, one on each end of the housing. I replaced both while I had it apart. May need to replace the ferrule also. Mine was pitted. The help I have received here while working on my machine has been great.

Bruce