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Old 08-03-2021, 08:17 PM   #1
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Cummins 8.3 330 HP Overheating "HELP"

Looking for help!!
2007 Newmar Ventana
8.3 Cummins, 330 HP
Engine will always run in the 205-215 range going as high as 225 on a good pull but will not boil.
What have I done so far?
-New radiator
-New Fan & shroud
-New thermostat, (a few already)
-New water pump
-New temperature sensor

Has engine temperature checked with infrared gun.
guage around 210-212
-At sensor 212
-Other side of engine 196
-At water pump 194

I am at a loss!!
Spoke to various mechanics, nobody has an answer.
Some say as long as it is not boiling and I'm not loosing coolant, "don't worry about, even at 225 I won't hurt the engine".

Any advice would be greatly appreciated.
I'm not very on the ball in checking sites like this but feel free to call me (Johnny) at 780-926-9588 or email at johnny@rigmatsab.com
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Old 08-03-2021, 09:06 PM   #2
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Is the fan installed in the correct orientation?
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Old 08-03-2021, 09:38 PM   #3
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If I had one dollar for every time I put fan on backwards.. over 50yrs I would be so rich.. I don't blame you for being so worried.. the eng cost $$$$$ so.. are you doing the work yourself ? I would check fan again.. I would get lower thermostat.. 1st.. I would run with no thermostat.. see what it does... if it stays in the range you like.. then you know rest of eng ok.. then put in lowest thermostat you are comfortable with.. I would check oil cooler.. if you have turbocharged engines check boost.. then next gets harder like injectors.. and timing .. of injectors.. I don't have one.. don't do much work on diesel.. I know about eng.. and they can burn up.. and in rv.. big bucks.. I keep my stuff forever.. so there has to be a way to add another oil cooler.. can you add extra cooling fans.. then you can go to something like big box auto parts store and borrow radiator bleed down test.. for free.. the kit comes with many adapter for every radiator.. and it will tell you if there is internal leak good luck and let us know what you did and maybe better members then me will help you
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Old 08-03-2021, 11:10 PM   #4
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Cummins 8.3 330 HP Overheating "HELP"

Ok my two cents….. what’s the oil temp reading? That will give you some indication of the engine temp.

This could be a bad temp sensor or gauge I did not see any work done on those two items.

Other may know better on how to verify the engine temp vs what the gauge says. One way I know is to get a scanguage d or a BlueFire that can read the data on the bus vs the data at an analog gauge.

I can tell you this I can make my temp gauge move by turning the dash lights up and down.

The sensor and gauge are ohms matched and if they are not the same the reading will be incorrect. Or that long run from the back to the dash could be causing the ohms to be off.
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Old 08-03-2021, 11:14 PM   #5
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Sorry I see now that you replaced the temp sensor…..

But I would get something to read the temperature off the data bus the infrared will read the block temperature not the water temperature.
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Old 08-04-2021, 06:52 AM   #6
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Installing lower temperature thermostats won’t do anything unless there is something faulty with the current units. An open thermostat at a lower temperature will still be open. I can guarantee that running without thermostats in an 8.3 will cause it to overheat. The thermostats seal off the coolant return flow when opened. Without the thermostats coolant will flow out of the cylinder head and follow the path of least resistance which is right back into the water pump inlet. That’s just my two cents worth of free advice though.
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Old 08-04-2021, 07:29 AM   #7
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-Tried running without thermostat, RESULT no change
-Fan is running in correct orientation
-Motor has had a complete rebuild incl. new injectors, turbo, etc.
-Checked engine temp with computer hookup, RESULT same as gauge
-Oil temperature, NOT SURE HOW TO GET THAT READING, will ask mechanic
-All work was done by a certified Cummins technician
-Transmission oil temp running steady at 208-210
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Old 08-04-2021, 10:40 AM   #8
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Saw this post

I contacted Cummins and this was their response...

"The maximum temperature the engine can reach is 225 F. At this point the engine starts to set fault codes and will likely derate its power output in an attempt to save itself from a dangerous overheat. Normal temperatures are anywhere from 190-210 F."

Was the temps that high before the rebuild?
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Old 08-04-2021, 10:41 AM   #9
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I am sorry I did mean trans temp.
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Old 08-04-2021, 10:42 AM   #10
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Also I don’t know your rig is this a side or rear radiator?
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Old 08-04-2021, 11:26 AM   #11
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Rear radiator

Always run fairly hot but seems to maybe be running hotter after rebuild
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Old 08-04-2021, 12:14 PM   #12
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How about a bad radiator cap? Not holding pressure. Or could there be an air pocket in the engine? Does turning on the dash heater bring the temp down?
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Old 08-04-2021, 01:29 PM   #13
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Sorry for the question but anything blocking airflow like bikes or ladders….
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Old 08-04-2021, 01:37 PM   #14
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turning on heater does not make a difference
Radiator cap good
nothing blocking airflow
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