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Old 05-15-2021, 01:47 PM   #1
New Member
Join Date: May 2021
Posts: 1
Thomas Bus HDX Mercedes Engine problem

Anyone with “serious” Mercedes Benz rear Diesel engine knowledge:
2004 Thomas Built HDX Bus overheating. Stuck in Alabama. Afraid to attempt the trip to TX. New water pump, belts, lines, coolant. No leaks. Fan good. Running at 200 degrees without any weight (bus stripped). No idea where to find mechanic near Enterprise AL. Trying to see if we can find tools nearby to do a pressure test. Worried it could be a cracked head or head gasket issue. Trapped in East bumfuck. Desperate for any guidance/direction from you gear heads. No idea where to turn for help without getting screwed.

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Old 05-15-2021, 01:50 PM   #2
Bus Nut
Bert06840's Avatar
Join Date: Mar 2021
Location: New York
Posts: 323
Year: 2009
Coachwork: Gillig
Chassis: G27E102
Engine: Cummins ISL 280
Rated Cap: 30,000 lbs
I have no Daimler engine knowledge, but you have my sympathy. It’ll do as much for your problem as one of those miracle cure bottles.

Good luck.
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Old 05-15-2021, 02:17 PM   #3
Join Date: Jan 2017
Location: Maryland
Posts: 35
Year: 2005
Coachwork: International
Chassis: RE300
Engine: DT466E
Rated Cap: 30 + 2 WC
Im not an expert in this, but 200 does not sound abnormal. I looked online, and it appears that the mbe900 operating temp is 180 to 220. I know my international dt466 runs 190 to 210. Are there any other symptoms that may help with troubleshooting?
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Old 05-15-2021, 02:42 PM   #4
Bus Nut
Join Date: May 2018
Location: topeka kansas
Posts: 888
Year: 1954
Coachwork: wayne
Chassis: old f500- new 2005 f-450
Engine: cummins 12 valve
Rated Cap: 20? five rows of 4?
Couple of questions

Is there a reason you consider this bus to be overheating? What has changed? 195 is my preferred operating temperature for engines made after 1990. The hotter you can safely operate an engine, the more power you should be able to extract from the fuel.

Do you have an infra red non contact thermometer?

I also find thermostat specification of 95 C = 203 F

785 207 7600

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Old 05-15-2021, 05:27 PM   #5
Bus Crazy
joeblack5's Avatar
Join Date: Dec 2015
Location: pa
Posts: 2,135
Year: 98
Coachwork: 1. Corbeil & 2. Thomas
Chassis: 1 ford e350 2 mercedes
Engine: 7.3 powerstroke & MBE906
Our 2004 mbe 906la runs 205f all they long. Hydraulic fan comes on and goes off.
What is yours doing?

Good luck
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