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Old 01-10-2014, 07:41 AM   #1
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Does oil on the rear mudflap mean a problem?

Looking at a used diesel pusher and I noticed that the rear mudflap under the engine was caked with oil. That seems like a warning of some possible issue. Anyone have a deeper insight as to what might cause this?


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Old 01-10-2014, 07:44 AM   #2
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Could mean fresh oily ass vault!

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Old 01-10-2014, 07:50 AM   #3
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Pop the hood and look for oil residue on the Radiator, if so the breather tube is puking some oil ( normal ) to an extent. Those rear Radiators need to be cleaned on a regular basis.
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Old 01-10-2014, 08:14 AM   #4
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It could only mean that the "slobber tube" which vents crankcase vapors hasn't been extended beyond the mudflap. A Cummins service facility can do a crankcase pressure test to see if the engine blowby is within normal parameters; for an investment of this size, it might not hurt to make the deal contingent upon the engine passing a Cummins evaluation protocol.

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Old 01-10-2014, 08:14 AM   #5
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May be a slobber tube extension above that location.
If a CAT engine it may have been overfilled on a oil change.
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Old 01-10-2014, 09:00 AM   #6
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Mr. M

Your best bet is to get a crank case pressure test as RustyJC stated. There could be a costly condition with the engine or there could be a simple reason such as over filling the oil as Triker56 stated.

One would normally not get a "caked with oil" condition unless an engine has excessively high miles (hundreds of thousands), or if something is wrong. Before you make this purchase you really need to find out why, especially if this MH is low mileage (you didn't post it's mileage or engine type).

Also, you need to get the radiator cleaned as NHRA225 stated, because if there is oil on the mudflap the radiator is probably heavily coated with oil and you will have over heating issues. From the condition you described, cleaning will take quite an effort and you will find many posts on this forum about that issue.

Good luck and please find the answer to why the oil before you buy an otherwise nice coach.

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Old 01-10-2014, 09:17 AM   #7
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Thanks for the responses. This is very interesting information. The engine is a 330 CAT, and the mileage is not excessive, 45k or so. This is not the first pusher I have looked at with this symptom of a blackened and oily mudflap. So I am trying to learn what it means.
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Old 01-10-2014, 09:24 AM   #8
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There can be a few things at the back of the coach that can make that mess on the mudflap. As mentioned, the crankcase ventilation tube can be the cause, particularly if the oil level is too high in the engine.

The front engine crank seal can be leaking, as can the timing cover gasket. The front seal is not a big cost to fix. The timing cover gasket is.

If the hydraulic canister is located at the back, there could be a leak there from one of the hoses, or from the canister itself if it has been overfilled.

Good luck.

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Old 01-10-2014, 10:30 AM   #9
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Does the front side of the mudflap have the same oil covering as that rear side does?
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Old 01-10-2014, 10:36 AM   #10
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I bet it is your slobber tube, and is likely not an issue. You can remedy the oil from the slobber tube via an extension or catch cup pretty easily. The slobber can be exacerbated by overfilling the oil typically. Mine is a side rad, but as others have said you definitely need to have the radiator cleaned if you choose this coach.

When I serviced my C9 and filled it to the top of the mark on the dipstick (without measuring carefully how much oil I added) I actually oil-misted the rear of my coach (and likely any fool following too closely!). I have confirmed with CAT the capacity of my C9 (33 Qts) and on my next oil service will add 29 Qts, then check dipstick, then add 4 and check dipstick. The 29 and 33 reference points will now be my add and full marks on my newly calibrated dipstick.

BTW, I also added a catch container below my slobber tube as MANY others have and it works perfectly.

Good luck on your search!

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Old 01-10-2014, 02:48 PM   #11
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I would suggest you get it to a qualified service company that can
lift the coach up for a thorough examination of the power train.
There are harmless leaks that are easy to fix, and leaks that are
extremely expensive to fix. If there are no leaks, it may have been asphalt,
but if so it would be focused behind the wheels, and you should
see evidence up behind the front wheels as well. I had a leak that
covered one side of the block down to the oil pan, it was a loose
clamp !
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Old 01-10-2014, 04:21 PM   #12
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Check seals on engine

I had a similar issue - when I returned home after a trip I saw oil reside on the toad - did some checking and there were some oil showing on the oil pan. Initially we thought is was from the overflow tube. Turns out that during the manufacturing process, the seal that was installed wasn't done correctly. Cummins dealer repaired the problem under warranty.
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Old 01-10-2014, 04:43 PM   #13
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JMO, but if the MH was maintained that poorly for something that maybe a simple solution, how was the rest of it maintained???
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Old 01-10-2014, 09:16 PM   #14
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Originally Posted by brobox View Post
JMO, but if the MH was maintained that poorly for something that maybe a simple solution, how was the rest of it maintained???
I'm with Brobox. This oil residue is an indication of overall poor maintenance procedures.

There are score of used Phaetons on the market. I would walk away from this one.

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