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CATEGORY LISTINGS > CATERPILLAR > CAT C-15 Massive Coolant Loss [ REFRESH ]
Thread Title:

CAT C-15 Massive Coolant Loss


Created On Sunday July 15, 2012 08:58 Diesel Talk
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mlenar
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Joined: Jul 2012

Note Sunday July 15, 2012 08:58 View thread in raw text format
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Hey I'm new to this forum and I have a peterbilt 387 with the cat c-15 acert 475 HP engine and have a massive coolant loss. I'm losing about a gallon of coolant every 250 miles or so. There is no white smoke out of the exhaust, no visible leaks anywhere, oil is fine and not deluted/increasing. Where might this coolant be going? I do most of the work on my truck so I'd like to try to fix this before bringing it to the dealer. Tried searching for a similar problem but found nothing. Hope someone knows what might be wrong and let's me know. Thanks guys.
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truckdoctor
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Note Monday July 16, 2012 20:53 View thread in raw text format
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Look on the passenger side behind front cover in the middle it's the water pump check for anti freeze staining green red extended life or white crusty indicates leaking a very common place for C15 Cats to leak.
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mlenar
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Note Thursday July 19, 2012 05:13 View thread in raw text format
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Yea I just replaced one on my other truck but unfortuneately its not the case with this one. Couple more symptoms I've found, smells like antifreez really bad when braking or idling, used up 7 gallons in 2 days, and small drops are comming out of the exhaust coupler right after the 1st elbow behind the engine...
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TDcrash63
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Note Friday July 20, 2012 16:43 View thread in raw text format
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Probably a head gasket. Most likely burning it. Take a clear bottle of some sort. Plastic is ok. Figure out a way to hang it or tie it up in a way where it will stay upright with the radiator overflow hose in the bottle with end submerged. Drive the the truck as you normally would. Pull over after 30 miniutes or and hour of normal driving, the harder the pull the better but not always necessery. Pull over and park. Leave engine running. Idle up to 1600 rpm if possible. If not as high as possible. Raise hood. Put the clear bottle half full to 3/4 full of water up by radiator and run radiator overflow hose into bottle. Let run like this for 10 miniutes. Do not open the radiator cap. If you see a steady stream of air bubbles you have a blown head gasket. It is common for these engines to have head gasket/cracked head failures. If you pull a good oil sample you will pick up salt and pottasuim in the sample indiacting coolant is bieng burned. You most likely not see any white exhaust or milky coolant right away or ever. If no bubbles pressuize the system with the engine off and look for leaks. I have seen hoses to the sleeper rubbed that only leak going down the road or when 12 to 15 lbs of pressure are applied.
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JoeZ
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Note Friday July 20, 2012 18:44 View thread in raw text format
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By any chance, do you have a water cooled turbo?

-------------------------
One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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