I recently acquired an old Ford 4000 HD industrial backhoe. I haven't got it running yet but I noticed the oil is full of diesel fuel. The previous owner said he had to change the oil a lot. I am wondering if the injector is leaking into the crankcase and if I could fix it without getting the injector pump rebuilt. The serial number on the backhoe makes me think it was built around 1962. Other than the oil issue, it looks in pretty good shape for its age.
I'm not familiar with your engine but I'd think it would be hard to get that much diesel into the crankcase from the injector pump, the injectors inject a fine mist and too much would make it run extremely rich and very poorly, smoky, etc... If it has a mechanical fuel pump mounted on the engine to deliver fuel to the injector pump from the fuel tank (sometimes called a lift pump) like an old car has, it can let fuel into the crankcase if the diaphragm in it gets ruptured..fuel delivery to the injector pump will be reduced as well, but some injector pumps generate enough suction to keep the engine fed with fuel even if the lift pump is compromised or "dead", it will take a lot of cranking to get it to fire up though..
Oh well, so much for that theory !.... I would think if it's running so rich it will get diesel in the crankcase it would be smoking like a tire fire and running quite poorly?..unless there is some other way for diesel to migrate from the injector pump into the crankcase I don't have an answer for this one!.
It this has the 4-cylinder engine with the manifolds on the same side, it would have a vertical pump like a distributor. If it has a leaky seal, fuel can go right into the crankcase.
Im going to order a seal kit for that roosa master injector pump on ebay and replace the ones that would make it leak through to the oil
dale the roos master pump uses 2 umbrella seals on the pump drive tool. if they leak, they pour,and with gravity feed,forget about it, it has all day and all nite to leak in. mike