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Open Roads Forum  >  Class A Motorhomes

 > Possible Causes of Coolant in Oil on ISC 350 - Updated

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ChaosAgent

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Posted: 03/26/12 07:55pm Link  |  Print  |  Notify Moderator

Coming into Las Cruces yesterday, my Cummins 350 ISC quit like it was out of fuel, with no Check Engine light.

After being towed in to the shop last night, they found coolant in the engine oil this morning.

Everything was fine 1800 miles ago when I had all filters and fluids changed. Also have seen no problems or funny readings on my Siverleaf.

Service Manager said it could not-too-bad to really bad.

Anyone have any ideas on what the possible causes could be?

Thanks for any help.

StuckInLasCruces

--------------------------------------------------------

UPDATED 3/27
Well, we know a little more after today.

They removed the oil pan and found about two quarts of coolant in the oil.

They then over-pressurized the cooling system and except for a couple of very small external leaks around hose connections, no coolant showed up anywhere.

The Tech even joked he wondered if someone just poured coolant in the oil. He also said they found no sign of oil in the coolant. So whatever's leaking is only going in one direction.

So tomorrow they're going to put the pan back on, fill it with oil, get it running, and see what happens.

Anyone have any other ideas?

* This post was last edited 03/27/12 09:39pm by ChaosAgent *   View edit history


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stubblejumper

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Posted: 03/26/12 08:00pm Link  |  Print  |  Notify Moderator

Blown head gasket ?
Warped head ?
Cracked block ?

Mechanic will be only one who can confirm.

Hope for the gasket and good luck.


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wolfe10

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Posted: 03/26/12 08:15pm Link  |  Print  |  Notify Moderator

Many HD diesels have an oil cooler built into the coolant system/block. Could just be a gasket there.


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Mooshaker

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Posted: 03/26/12 08:34pm Link  |  Print  |  Notify Moderator

Don't want to make you feel bad, but, we just spent over $8000 for an inframe overhaul in an International truck. The truck started using water. One of the sleeves had become unseated allowing the water to go into the crankcase. Hope this is not your problem. Good luck.

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Posted: 03/26/12 08:46pm Link  |  Print  |  Notify Moderator

I'm gonna guess that it's either the cooler seal or the water pump seal/gasket. We've got John Deere Gensets on the Tug, and that is the problem we have with them from time to time.

Unless you've overheated the block, the chance of the head gasket failing is less likely, though it can still happen...a failure is a failure.

Not uncommon for the seals/gaskets to fail, especially if the coolant treatment isn't kept up to specs.

Good luck, hope it's the cheap fix!!


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hohenwald48

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Posted: 03/26/12 09:23pm Link  |  Print  |  Notify Moderator

Once upon a time Monaco used radiators that had thd transmission cooler incorporated into the same radiator as the engine cooling. They had failures of the radiator that allowed coolant to get in the transmission. I suppose that if the oil cooler was incorporated into the same radiator as the engine coolant a similar situation could develop. I know a lot of gas engine cars have this kind of radiator design. At least if that was the problem it would be a fairly simple fix.


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ChaosAgent

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Posted: 03/26/12 10:29pm Link  |  Print  |  Notify Moderator

Thanks to everyone for all the great info.

Pretty sure there has been no overheating. The coolant temp was running its standard 175 degrees right up until the engine quit.

Here's hoping for something cheap, though cheap is usually relative working on a diesel.

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