I have a question about a 567 prime mover in an old geep 9. It has come to my attention that when I clean the carbon tramps on this engine 2 of them are pretty clean and may have some carbon in them. There are others that have this black tar like stuff in them. It has to be cleaned out with a scrapper. I think it has something to do with the lube oil. Does anyone know just waht's going on with this engine.
Thanks

I would suggest removing all the air box handhole covers and inspecting each cylinder power assembly through the air inlet ports for broken compression rings and evidence of excessive lube oil or fuel being bled out of the ports. Look for any piston crowns that are wet with unburned fuel which could indicate an injector with a bad needle valve or tip. Also take a look at the air delivery chutes from the roots blowers to make sure you do not have a bad blower shaft seal throwing lube oil into the air box. And look at the liner walls through the air inlet ports to make sure they are not all varnished up from light load running. Inspecting through the engine air box is the easiest for troubleshooting, but if you still cannot determine which cylinders are causing the problem then you may need to get a look inside the exhaust manifold cans to see which cylinders are at fault.

But what would really help you is to watch eBay and try to get a copy of any post-1980 EMD 645 engine manual that has the extended troubleshooting guide in the back. This guide section is very extensive, is as applicable to the 567 as it is to the 645, and addresses all these issues. There was no comparable guide in the original 567 engine manuals.

PC

I agree with Preston, there is no substitute for a good air box, piston, ring, and liner inspection.

Some other things I would do before an inspection to narrow things down a bit would be:

Rack out individual injectors. With the engine at idle disconnect individual injector linkages and rack them out. There should be a noticeable laboring of the exhaust. If not you have a cylinder that is not firing.

With the engine up to temperature take a digital non contact thermometer and shoot the individual exhaust manifold legs. What your looking for is a leg or legs that are running significantly cooler. Again this speaks to firing.

Although not in the EMD book, a good method of isolating a power assembly that is pushing oil is; with the engine at idle, wearing gloves and safety glasses, remove the cylinder test cock needle and hold a white paper cup in front of the open test port. A cylinder that is running well will push out a mist of fuel. You'll be able to tell pretty quickly when you find the one that is pushing oil.

EBL