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Old 08-07-2015, 10:59 PM   #21
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Join Date: Sep 2013
Location: Denver
Posts: 489
Year: 1982
Coachwork: Blue Bird
Chassis: International S1800
Engine: DT466 Trans: MT643
Rated Cap: 65
Yeah and i bet its the liner o rings that went if i had to guess. Coolant maintenance is the essence of being in a bus, particularly one with wet sleves. Sca's are important. I just flushed my system and refilled with the expensive CAT coolant. I have a dt466. Ive seen coolant neglect or naivete ruin more engines than oil issues.

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Old 08-07-2015, 11:05 PM   #22
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Join Date: Mar 2015
Location: Statesville, North Carolina
Posts: 467
Year: 1993
Chassis: Thomas
Engine: International Navistar DT360
Rated Cap: 60
We're hoping for O-rings instead of sleeves. Then maybe we can get away with replacing them instead of a rebuild. We used heavy duty coolant with SCAs and I believe the school bus garage did as well. I hate it cause I had just put 5 gallons of new oil, new oil filters, and 2 gallons of new coolant in it. All down the drain now. Not to mention we JUST got the tags and insurance the same day it happened!
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Old 08-09-2015, 01:54 PM   #23
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Join Date: Mar 2015
Location: Statesville, North Carolina
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Year: 1993
Chassis: Thomas
Engine: International Navistar DT360
Rated Cap: 60
It was the O-rings!!!! Seems that they were damaged and pinched upon insertion because one was just hangin' around not even attached to anything. The rest are pretty hard and brittle from overheating.
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Old 03-08-2022, 09:00 PM   #24
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Join Date: Jan 2019
Location: Denver, co
Posts: 58
Year: 1999
Coachwork: International
Chassis: International (I think)
Engine: Dt466e w/ Allison md3060
Rated Cap: 84, 35000 gvwr
New thermostat for dt466e

Just thought I would post this here but I have the international manuals and it says that the thermostat was replaced with a new thermostat that opens at 190°F and is fully open at 212°F as opposed to the previous one which was 180°F opening fully at 202. This is for all engines with serial number 1082180 and above.

It notes the operating temp will be higher. Int. Part number 1 830 256 c91
Old part number 1 822 575 c92

Hope this helps
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Old 03-16-2022, 08:54 PM   #25
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Join Date: Jul 2015
Posts: 11
I have the 444e engine and had trouble with over heating. I got rid of the vicious fan and put a Horton electric fan And problem solved. I also put a manual switch on fan so I can turn it on when needed and leave it on if need be.
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Old 03-17-2022, 07:34 AM   #26
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Join Date: May 2009
Location: Columbus Ohio
Posts: 18,758
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
Quote:
Originally Posted by Hane View Post
I have the 444e engine and had trouble with over heating. I got rid of the vicious fan and put a Horton electric fan And problem solved. I also put a manual switch on fan so I can turn it on when needed and leave it on if need be.

I put a 180 Tstat, flushed my whole system and installed a Horton E450 electric fan clutch along with the 9 blade plastic 24" fan..



I also put a manual switch on and i set my fan on temp down lower than factory.. im on at 206 off at 198 instead of on at 214 and off at 205..



like you, no more hot T444E.
-Christopher
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Old 03-17-2022, 08:15 PM   #27
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Join Date: Aug 2020
Location: Greensboro, NC
Posts: 95
Year: 2008
Coachwork: IC
Chassis: IC CE300
Engine: Maxxforce DT
2008 Maxxforce DT here. 27', 26000 pounds. Runs 175F to 190F max when outside temp > 80F and full load.
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Old 03-18-2022, 06:53 AM   #28
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Join Date: May 2009
Location: Columbus Ohio
Posts: 18,758
Year: 1991
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Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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Originally Posted by Seb1 View Post
2008 Maxxforce DT here. 27', 26000 pounds. Runs 175F to 190F max when outside temp > 80F and full load.
that seems low for a Maxxforce.. IH likes to run those hot.. but if it warms up enough to complete its regen's then it should be OK
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Old 03-18-2022, 08:26 AM   #29
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Location: West Ohio
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Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Yeah, AFAIK maxxforce dt ran a 195°F thermostat. That's done to meet emissions. IDK what the minimum temp for regen is offhand.
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Old 03-18-2022, 06:25 PM   #30
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Location: Greensboro, NC
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Year: 2008
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Engine: Maxxforce DT
Humm, good to know. I believe my regens are going ok. I’ll investigate further. Thanks for the heads up though.
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Old 03-19-2022, 03:55 PM   #31
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Join Date: May 2009
Location: Columbus Ohio
Posts: 18,758
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
Quote:
Originally Posted by Booyah45828 View Post
Yeah, AFAIK maxxforce dt ran a 195°F thermostat. That's done to meet emissions. IDK what the minimum temp for regen is offhand.

if I remember right it needs to be 170-180 minimum.. I remember working on a 2009 version that failed regen because the heaters ate uo all the engine heat and the webasto was dead..



it was on a party bus .. it finally got to the point of trying to do forced regen but wouldnt start.. i read someplace.. possibly in the service book it had to be at least 170-180.. we ended up setting high idle with all heaters off and it did a parked -regen after it warmed up..
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