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Old 11-12-2013, 02:43 PM   #1
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Rear Main Leak

I hope I'm posting in the correct forum.

The engine is a 300 hp Cummings the bus is a 1995 Country Coach Intrigue, it has a hundred & seventeen thousand miles. Not sure if more information is required for a diagnosis, if so I’ll be happy to post it. Thanks in advance for any help, before I take off to the mechanic………*

I took my CC in for an oil change this morning and got a call from the service dept telling me the rear main seal was leaking, the bus wasn’t low on oil and there was no oil stain under the vehicle. My question is this; could I have something else leaking besides a rear main?

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Old 11-12-2013, 02:57 PM   #2
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First your best bet is to bring it home to where ever you are climb under her and take a look for your self. If the rear main seal is just seeping and collecting dust it is not a big deal but if you see a drip hanging off it you will need to do something. 117,000 miles the main bearings will have some wear and allow the crankshaft to move in the 10s of thousandths of inches which I would think to be normal at that mileage. So seeping and collecting dust not to worry to much. I was a diesel mechanic for many years.

George & Jerri
06 GT 340TSSE
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Old 11-12-2013, 04:14 PM   #3
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at 117,000 miles if it is a little damp then not to worry. Go to Walmart or an Autoparts store and buy an aerosol can of engine spray cleaner and spray off the whole area under the engine then hose it off and watch it for a a few moths. The other thing is to check that all the oil pan bolts are tight and also that the oil is not leaking down from the valve cover on top of the motor or an oil pressure sensor.
Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
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Old 11-12-2013, 04:33 PM   #4
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I just had a good scare with my 99 Cummins 5.9l, where the entire oil pan was caked front to rear with crud. I even had a significant amount of crud on the radiator. About half of the pan bolts were wet with oil, yet no dripping.

I thought I was really in for a $$$$$ repair.

I had my mech change the pan gasket with an OEM Cummins gasket and change the oil. He also felt into the torque convertor housing at the bottom and came up with dry fingers. After some driving, he looked and found that the pan gasket was the failure...NO MAIN SEAL LEAK!!

I have also put a plastic gatorade bottle over the crank case vent tube and tie wrapped it to the chassis so any oil that comes out of the tube goes into the gatorade bottle. I think this was one factor to such a horrendous amout of oil buildup, along with the pan gasket.

You would do yourself a huge favor to fully wipe your pan down where it meets the block, fully. Clean that thing so you can eat off of it and drive your coach for a while. Monitor your oil level and even if you're losing oil, keep it topped off for the test period and take another look at your pan, front main, rear main for ANY sign of oil. If you find it's not your pan gasket, work your way up from where you get oil witness staining. This should be easy to work out, if you're patient.

Don't just take their advice. Even if you have to spend a little bit of money to prevent that huge rebuild cost, it's money well spent. IMO
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Old 11-18-2013, 12:39 PM   #5
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Thanks for all the advice and help, I think I have solved the problem. The rear main seal is not leaking I do have a pan gasket leaking and a timing chain cover leaking, a problem that needs addressing but not a rear main.

Thanks again for the help, all the replies they were all very helpful.
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