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Old 02-18-2019, 03:06 PM   #1
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DT466e Possible Coolant Problem

So I was driving today on a test drive, and figured I'd stop by autozone and top up my coolant since I didn't quite fill it up to the line the week before, and could always use a spare jug of the stuff "just in case".

The coolant chamber was nearly empty, about 1/4 full. I filled it up to the line and bought an extra gallon.

Took it on the rest of the drive, did push highway speeds at 2650RPM for around 30 minutes, with an additional 30 minutes of 2200RPM at 45MPH. After this I checked the coolant level again, and it had reached about 2/3.

I'm concerned about this, although after cranking it up again and doing some more drives at 2500RPM or lower, the coolant level was at the same spot.

No smoke from exhaust, but there is some light smoke coming out of the oil fill pipe. White and barely visible, but there.

I also see a rather new wet spot on the bottom left side of the DT466 (if you're facing it and the radiator is facing you) where the coolant line goes into the engine, so I'm hoping that's the source of the leak.

I tried running the engine with the coolant cap off, the coolant did not drain immediately, and stayed at the same general level at idle to 1500RPM under no load for 10-15 minutes.

There is also no smoke coming out of the exhaust when started, I've been checking that on a weekly basis and none have been seem.
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Old 02-18-2019, 03:24 PM   #2
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It takes alot of effort to burp the cooling system of a bus!

Does the vapor coming from the oil fill tube smell sweet?

Also check for vapors coming from the blowby tube.
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Old 02-18-2019, 04:14 PM   #3
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Quote:
Originally Posted by geminusprime View Post

No smoke from exhaust, but there is some light smoke coming out of the oil fill pipe. White and barely visible, but there.

I also see a rather new wet spot on the bottom left side of the DT466 (if you're facing it and the radiator is facing you) where the coolant line goes into the engine, so I'm hoping that's the source of the leak.
If you're looking at your engine from the front, the bottom left side is going to be your oil cooler. Your coolant runs through it to draw heat out of the engine oil. It's a long cylinder looking thing.

It may be helpful if you took an oil sample and sent it in to Blackstone Labs in Fort Wayne, IN. They can tell you if you've got coolant in your oil. Also a really good peace of mind to have. You can get the oil sample kit directly from them.
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Old 02-18-2019, 10:12 PM   #4
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Quote:
Originally Posted by EastCoastCB View Post
It takes alot of effort to burp the cooling system of a bus!

Does the vapor coming from the oil fill tube smell sweet?

Also check for vapors coming from the blowby tube.

The vapor doesn't really smell sweet, kind of just plain old industrial fumes but barely that. Nothing at all coming from the blowby.



Quote:
Originally Posted by rensch26 View Post
If you're looking at your engine from the front, the bottom left side is going to be your oil cooler. Your coolant runs through it to draw heat out of the engine oil. It's a long cylinder looking thing.

It may be helpful if you took an oil sample and sent it in to Blackstone Labs in Fort Wayne, IN. They can tell you if you've got coolant in your oil. Also a really good peace of mind to have. You can get the oil sample kit directly from them.
Pretty sure that's it, it matches your description. Long tube thing going from front to back on the lower left hand side of the engine block.

Just got the sample kit last week, gonna take a sample this week and send it in.
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Old 03-01-2019, 05:03 PM   #5
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So been try to do my best to solve this during our current week long rainstorms. Despite it seeming like it's the oil cooler, my local district said I also had a leak in my cab heater...which is directly over the area where coolant is leaking. I also did some tests and it seems I do lose much more coolant when the heater is running, although this may be flawed as I did drive different distances.
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Old 03-01-2019, 05:33 PM   #6
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bus heater cores are norotious for leaking... as are the hose connections going into the main heater... all 3 of my busses have had really small seepage leaks around the heater hoses connecting one of the heaster cores or the coolant booster pump.. ive fixed all but one. (my 40 year old bus needs a new main heater core).. by simply taking at least 1/2 turn on the hose clamp screw..
-Christopher
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Old 03-02-2019, 05:15 PM   #7
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Pulled the cover off the cab defroster cover today, sure enough not only is there a leak in the hose coming from the coolant pump and into the heater core, but the hose going into the T is also bent and leaky.

Guess where both are leaking out of - right over the oil cooler on the bottom of the engine.

At least the area is accessible from in the cab with the engine cover off with the rain we've been getting in upstate SC.
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