Engine Coolant Temperature Gauge 4540/4550

   / Engine Coolant Temperature Gauge 4540/4550 #1  

WorkingToLearn

New member
Joined
Aug 24, 2019
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22
Tractor
Mahindra 4550
I bought a 4550 w/ 400 hours recently. After a couple of uses I noticed that the engine temp gauge is dead. There's no local Mahindra dealer. The nearby Kubota shop suggested I look for a loose wire at the sensor(s) that extend above the radiator. Any sensors do not appear to be above the radiator on this tractor. Didn't find anything in the manual. Can anyone suggest where I could start with this problem before I call for service? Thank you.
 
   / Engine Coolant Temperature Gauge 4540/4550 #2  
Coolant sensors are somewhat generic. They typically screw into the cylinder head and have 1-2 wires. A lot of times they are brass in color.

The sensor gauge style typically sweeps a range of resistance and the idiot light style typically is a switch to ground.
 
   / Engine Coolant Temperature Gauge 4540/4550
  • Thread Starter
#4  
Thanks RNeumann, I'll check for a loose sensor on the cylinder head.
 
   / Engine Coolant Temperature Gauge 4540/4550
  • Thread Starter
#5  
Thanks gardner175. I'll read this thread after work today.
 
   / Engine Coolant Temperature Gauge 4540/4550
  • Thread Starter
#6  
Thanks again, very informative thread. Seems like there are at least 2 or 3 take-aways.
Since I'm very new to tractors, I'll discuss with the mechanic I like and see what he thinks.
 
   / Engine Coolant Temperature Gauge 4540/4550 #7  
I have the 4540 and the local Mahindra dealer put in an inline restrictor in the rubber hose coming out of the radiator so it would raise the temp, it worked perfect.

Our 4540 wouldn't even touch the green before the restrictor was put in.
 
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   / Engine Coolant Temperature Gauge 4540/4550 #8  
you may want to call your dealer and have them check to see if there is a ECU reflash for your tractor. Have them check to see if TIB 16.008 has been done to you tractor. Reflash corrected a lot of issues.
 
   / Engine Coolant Temperature Gauge 4540/4550
  • Thread Starter
#9  
I have the 4540 and the local Mahindra dealer put in an inline restrictor in the rubber hose coming out of the radiator so it would raise the temp, it worked perfect.

Our 4540 wouldn't even touch the green before the restrictor was put in.

Just trying to understand, do I want to raise the engine temp just to be able to confirm that the temperature gauge is working? Or does the tractor tend to run with a temp that is too low and raising it is good for the tractor?
 
   / Engine Coolant Temperature Gauge 4540/4550 #10  
Just trying to understand, do I want to raise the engine temp just to be able to confirm that the temperature gauge is working? Or does the tractor tend to run with a temp that is too low and raising it is good for the tractor?

I seem to remember other threads about Mahindra models that ran cool. All emissions engines have a temp range they were designed to run in. If they aren’t getting warm they aren’t running as they should. They make digital IR thermometers. Last time I looked they were under $20 on Amazon. They look like a little pistol and can tell you the surface temp of an object. I’m guessing the engine should be in the 180-220° range when at normal temp. Check the top of the radiator and the thermostat housing to see what it is running at.

On my Mahindra I have to cover the grill in the winter or it won’t come up to temp.
 

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