5600, 256cid, oil in exhaust

Low Flyer

Member
Guys, my 5600 is putting oil in the exhaust. It comes out of the bottom of the muffler, runs down the exhaust manifold, and then down the side of the engine. There does not seem to be any blow-by coming from the crankcase vent tube. The black smoke is noticeable when it is first started after sitting for a few days. I'm thinking valve seals. What do you guys think? Could it be coming from somewhere else? I don't think it sounds like rings.

Thanks,
Gil
 
What kind of work do you do with this tractor? Is it getting up to operating temp? Hard to say without more information, but it sounds like it's wet stacking from running cold and not burning all the fuel. Too much idling or light work in cooler weather is when you start to notice it.
 

We were not working it hard, that's for sure. I wasn't the one on it. We were burying water pipe and using the tractor with a box scraper to fill in the ditch. It was doing this light work for about an hour, maybe a bit longer.

The injector pump is brand new about 20 hours ago, and not installed by a Ford service center. I think that it may be idling high. It idles at about 900 rpm.

One other thing, and I don't know if this may be related, but every once in a while the rpm will jump up by itself, for just a second, then come right back to where it was. Though I haven't been able to see the exact amount of rpm that it jumps, I would guess it to be between 50 and 100.

I bought this tractor from my uncle just last month, and I used it many times over the past 3 years. I never noticed what appears to be oil in the exhaust until today. There is no indication of it doing this before. However, I mentioned it to my uncle, just in casual conversation, and he said, "That was supposed to be fixed. That's the reason that I had it rebuilt." He claims that it was rebuilt when the injector pump was replaced, and he has the reciept to prove that he paid for a complete rebuild of the engine. But I have doubts that it was rebuilt. I suspect that money changed hands, but that the person didn't do the work. I'll inspect all of the fasteners tomorrow and report to you what I find out.

Gil
 

Perhaps improper break-in so that rings are not seated, coupled with light work so that it doesn't come up to temp so pistons don't expand as they need to.
 

Slobbering is common for this model.. especially if not worked hard.. Change thermostat to a 190 degree... will help..

The head is designed so that the valves are recessed and covered with oil.. as the valve guides wear a bit, it will pass a bit of oil out the exhaust... This design allows the tractor to sit for years and not have a valve rust open or stick. But has the problem of slobbering if not warm up.

Run a commercial injector cleaner can help also by getting a fine injection pattern and burning warm and completer.
 

Thanks for all of the help guys. Is there a procedure to check the injectors without having to take it to the dealer?
 

Would a clogged fuel return line cause excessive amounts of fuel to enter a cylinder?

I think I'm going to remove the exhaust manifold and see if one cylinder is wet.
 
Low Flyer, If you take things apart without working the tractor you may be looking for a problem that is not there. This is a powerful engine that needs to get hot and worked under continuous heavy load for a while. Stick a 4 bottom plow in the ground or a chisel plow and tear up some ground for one of the neighbors. It will probably stop slobbering.
 
(quoted from post at 17:14:58 11/25/14) Low Flyer, If you take things apart without working the tractor you may be looking for a problem that is not there. This is a powerful engine that needs to get hot and worked under continuous heavy load for a while. Stick a 4 bottom plow in the ground or a chisel plow and tear up some ground for one of the neighbors. It will probably stop slobbering.

Tom, I agree, however, I think that there may be a problem this time, but I've been wrong before and will be again. Anyway, do you and the rest of the folks here think the black stuff that looks like oil in the exhaust and the tractor's tendency to increase the rpm every once in a while could be different symptoms to the same problem, a clogged return fuel line?

If a return line is clogged the excess fuel pressure have to go somewhere, right? If it can't go back to the tank, it's logical to think that it will go in the cylinder, right? And when it does that, the rpm jumps for just a second then comes right back to the governed speed. And will this excess fuel cause the black, oil looking stuff in the exhaust, as others in this thread have stated?

I'm just trying to learn and figure this out. This is my first diesel farm tractor.

Thanks for bearing with me folks.

Gil
 
(quoted from post at 22:25:14 11/26/14)
Anyway, do you and the rest of the folks here think the black stuff that looks like oil in the exhaust and the tractor's tendency to increase the rpm every once in a while could be different symptoms to the same problem, a clogged return fuel line?

If a return line is clogged the excess fuel pressure have to go somewhere, right? If it can't go back to the tank, it's logical to think that it will go in the cylinder, right?
Gil

Gil
The tractors I've been around with a plugged return line run for only short periods of time or at lower not higher rpm's. If excess fuel is getting into cylinders then you have an injector problem plus there's no way return fuel can crack open the valve in an injector. If your engine speeds up it is most likely a faulty governor in the inj pump.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top