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Old 06-18-2017, 11:02 PM   #1
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DT466 and MT643 Questions

Toke my bus out for a drive the other day (second time in 6 months I have had on the interstate) on a 160 mile round trip to home depot. Just a test run and also to keep everything lubed up and running well from sitting around.

Also got the bus weighed at the local cat scale, steer is 10180 and drive is 13480 for a total of 23660 holly crap that's a big bus!

Overall it did very well, but I have few questions.

1: Is this normal shifting for a MT-643?
https://goo.gl/photos/EXRJeGBYsQSAmfAM8

2:How hot is too hot for a DT466? On flat roads and normal driving the bus is doing 60MPH at 2200RPM and won't budge from 180 degrees, but on long hills like a 6% grade for quite a few miles almost pedal to the floor doing 45MPH, I will see the temp gauge start to go up, On the dash when the needle was half way over "2" in 210 I was worried, next hill it was between the 2 and 1 in "210" I slowed down and downshifted into "3" and it held there until the top of the hill, the bus will very quickly got rid of the heat and settle back down to 180. The temp gauge is bit confusing I see the line for 210 is in the 0, I assume anything between the 180 line and 210 line is normal? What's the proper way to baby the DT466 up hills?

3. I noticed the voltage gauge is jumping around it will fall to just above 12 volts and bounce right back up to 14V, it will do that maybe once or twice a min I hope it's not the Alt the service records say it was already replaced to the tune of 800 bucks. It's 175Amp it says.
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Old 06-19-2017, 07:08 AM   #2
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Join Date: May 2009
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if you have a Bosch type alternator, it is designed to run in SI or single wire mode.. in single wire mode, it has no way to sense true system voltage, so from what I understand, the alternator shuts off for an instant every so often to "check" system voltage.. and then turns back on.. this has been doing this on my DEV bus ever since i got it and I did lose an alternator, put the same type on and it does the same. when I tested it with a Sense wire this operation didnt occur..

when your bus was nearing 210 did you hear the roar of an engine fan? if not, id begin to suspect the fan clutch could be bad...

-Christopher
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Old 06-19-2017, 07:40 AM   #3
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Sounds normal to me. My bus has a 466/643 and yours sounds like it behaves the same as mine.
I bought it in KY. On the way home it stayed just under 180 on the gauge.
We hit monteagle in TN (6% grade) and the temp went up into the low 200 range.
Pulled over at the top and let it idle for twenty mins and it stayed at 180 the entire way home to FL.
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Old 06-22-2017, 07:13 AM   #4
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Thanks guys for the feedback super helpful, I don't remember the roar of the fan on the long runs up hill (but there is a lot of road noise ect), but I do remember the roar of the fan when I pulled off the interstate got weighted and went to get back on, I could hear that fan. It seems total random when kicks in or not. I honestly don't hear it that much.

Glad to know everything is normal, as most of us never drove a school bus in my life and have not ridden on one for 20 years.
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Old 06-22-2017, 07:19 AM   #5
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the fan is somewhat "random" unless you are lucky and have an electronic fan clutch (mosrt dont), there is a little spring coil in the center of the fan clutch.. it measures the temoperature of the air coming from the radiator.. so the coolant heats up and warms the air that the fan is in contact with which will rotate that spring xoil and cause the fan to spin.. the fan spins, the air cools, and the clutch disengages.. at road speed its less likelyt for the fan to engage although when working correctly, it will when thinks get hot enough..

if you shut the bus off for awhile and restart it, the clutch almost always engages for the first couple minutes to distribute that fluid inside the clutch.. it also tends to run more at lower speeds as there is less air coming into the radiator so thigns are hotter..

its not really random but it kind of seems like that.
-Christopher
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Old 06-22-2017, 08:04 AM   #6
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gotta chime in on this one . Im having the same issue. On my 9 liter i replaced the spendy fan clutch with a new one. So when you are driving and the temp. hits 190-200 you should hear a notable difference in the fan noise ( very loud like a train) until the temp goes back down. this is the visco clutch engaging the fan i e spinning faster. So my dt4666 with the same tranny when i pulled hills last week in hot weather goes silent not good! At International they call for all old dt466 to be upgraded (1200$ in parts) to a Horten electronic fan clutch, to spendy. So Brent (my parts guy at IH ) went in the back and found something that fits ( only $500 :[ ) , Im gonna put it in today or tomorrow I will let you know how it works. P S yesterday 103, today102 degrees perfect weather to test the cooling system! And if anyone needs to know the joyus removal procedure let me know (get ready for sweat and bloody knuckles) If it works ill show you the part number and some pics, if not i will hang my head in shame and sell the dog to make back the $500 !
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Old 06-22-2017, 08:24 AM   #7
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Have to admit, I like Chris's fix. Drill a hole and bolt that sucker so it turns full time. Like the price too.
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Old 06-22-2017, 08:42 AM   #8
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I don't advocate it as a perm fix but if it means I can stay in the saddle with my AC on by god the drill is comin out
Christopher
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Old 06-22-2017, 09:18 AM   #9
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Quote:
Originally Posted by Busmanmoab View Post
gotta chime in on this one . Im having the same issue. On my 9 liter i replaced the spendy fan clutch with a new one. So when you are driving and the temp. hits 190-200 you should hear a notable difference in the fan noise ( very loud like a train) until the temp goes back down. this is the visco clutch engaging the fan i e spinning faster. So my dt4666 with the same tranny when i pulled hills last week in hot weather goes silent not good! At International they call for all old dt466 to be upgraded (1200$ in parts) to a Horten electronic fan clutch, to spendy. So Brent (my parts guy at IH ) went in the back and found something that fits ( only $500 :[ ) , Im gonna put it in today or tomorrow I will let you know how it works. P S yesterday 103, today102 degrees perfect weather to test the cooling system! And if anyone needs to know the joyus removal procedure let me know (get ready for sweat and bloody knuckles) If it works ill show you the part number and some pics, if not i will hang my head in shame and sell the dog to make back the $500 !
I bought my horton EC-450 fan clutch on fleabay new in the box for about 250.. then used a dakota digital fan contrioller.. now I have full control over the fan.. either first by coolant temp or I can click the manual button and spin it all the time if I choose..
I have thread here where i detailed the install
-Christopher
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Old 06-22-2017, 09:20 AM   #10
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on the long interstate hills such as eastern oregon, or past salt lake, when my cat engine gets up to about 200, I just slow down a little. I have never stopped to let the thing cool off. My detroits ran same temp range.
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