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Old 11-12-2013, 02:44 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, 02:55 PM   #2
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I will leave this to the experts to answer, but i tend to believe if you don't see oil lost and no puddle of oil on the ground, why bother to fix it? for a 18+ year old engine, seepage of oil is no surprise, you can wait at the least.
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Old 11-12-2013, 03:18 PM   #3
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Rear Main Leak

Well something is leaking fluid, so I really need to know what that could be. I understand the bus is old, but I still need to keep up the maintenance up on it. Besides it could be an easy fix, that’s why I’m asking. But thanks for your input...
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Old 11-12-2013, 10:37 PM   #4
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This is a cheap guy trick, but you need to figure out whete the leak is, and this works well and is cheap.

Get some good degreaser or dawn or other cleaner and a spray bottle and brushes.

Raise it up and get cleaning on the engine.

No need to get to only paint or like new, just get the layers of crud off and give it a good look.

Then look again for fresh shiny oil, then follow the trail.

Clean again along the trail, may need better job to get exact spot.

Found many this way...
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Old 11-13-2013, 09:57 AM   #5
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Rufus Earl, your 1st post states "the bus wasn't low on oil and there was no oil stain under the bus"???? so why did the mechanic say you had a rear main seal leak??? Have you your self seen an oil spot under the coach where it was parked for a period of time. IF you had a rear main seal leak you will have an oil stain/streak under the unit in the vicinity of the bell housing/transmission mount. Drive is home and put cardboard under the unit. Check it the next morning for oil and go from there depending if oil is on the cardboard or not and how much.
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Old 01-12-2014, 11:34 AM   #6
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CC rear main oil leak

Last year I bought 1999 C.C. Intrigue. I noticed a slight oil leak that appeared to be coming from the rear main seal. I whipped everything clean when I changed the oil. After the oil change I was underneath with the engine running checking for any oil leaks. I found the oil was leaking from a oil pressure sendor. The brass sensor was not even hand tight. It's very hard to see, located curbside above and forward of the starter. I just tightened it with a large open end wrench. I believe it was 1". This summer, i'll keep an eye on it.
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Old 01-13-2014, 11:39 AM   #7
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It is difficult for us to give you good advice except those who say, check it further yourself. Doing so might save you some money, or ID some money well spent.

I get the same "oil leak" comments from Jiffy Lube on my Jeeps. Yet neither has left a spot on my garage floor. Nor do I see a wet "leak" when I slide under.

Absent any real evidence, I assume the mechanic is covering his axx or trying to spark some additional revenue for the repair.
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Old 01-13-2014, 12:22 PM   #8
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Oil leaks most always appear to be more serious than they really are. A 1/4 cup of transmission or engine oil looks like a gusher after you have driven it 50 miles....oil is all over everything under the coach. Yet, when you check oil levels, they are all fine.

If you can accurately identify the source of the leak, then you can likely fix it with a Lucas product or some other aftermarket additive.

Until then, fugetaboutit.
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Old 01-13-2014, 12:29 PM   #9
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Rear Main seal leaks can be funny things. If the seal is really worn, then you will get a constant leak. Sometimes a bit of contaminant or crank case pressure will cause a temporary leak that will "fix itself" once the cause goes away. I had a 2004 Porsche that with under 800 miles burped a cup of oil onto the garage floor (from the RMS). Cleaned it all up and monitored it and it never happened again.
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Old 01-13-2014, 12:38 PM   #10
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For what it's worth I shoot my differential with my IR gun on every trip.

It runs about 160 degrees on average.

I figure if I lost fluid it would heat up so I kinda monitor it that way.
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Old 02-02-2014, 01:00 PM   #11
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Clean the crud off the bottom of the engine with a pressure washer. Drive it and monitor for leaks. Can try some additive to recondition seals if dried out. Changing rear main requires separating engine from transmission. If it's not leaking bad enough to lower oil level or leave a significant spot on the floor I would just drive it.
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Old 02-02-2014, 01:19 PM   #12
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Good advice on cleaning and checking it yourself. While your cleaning and looking, take a look at the Crankcase Breather that hangs down the side of the engine. Make sure it is not restricted in any way. As mentioned in another post, high crankcase pressure will cause leaks and the first place to check is the breather to make sure it is doing its job.
Rear main seals can and do wear but the biggest cause of a leaking rear main seal is excessive crankshaft main bearing clearance or excessive crankcase pressure caused by worn combustion area parts. In this case, Putting in a new seal is a band aid fix.
In short, if in fact you do have a leaking seal, with the mileage you have, it can get real expensive real quick. So, do your homework and get a 2nd opinion. Far too many parts are replaced by people that either don't know or are looking for a way to generate more revenue.
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