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Bosch Temperature gauge.inaccurate?

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Walter Buller
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PostPosted: Wed May 23, 2018 5:46 pm    Post subject: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

Next question: Today I installed a new 180 degree thermostat in my "94 Chevy dually with the 5.9L 12v Cummins motor because the new Bosch temperature gauge that I installed yesterday reached the 250 degree mark a few miles from home and even went beyond that to an estimated 275 degrees. But oil pressure was still good and the radiator was not blowing out coolant, nor did the motor have that "hot" smell. When I got back to my shop I used 2 of my wife's thermometers to check actual engine temperature. One is a stainless, sharp pointed meat temp. tester. The other is a glass candy thermometer. It is about a half inch wide and tapers down at the bottom to the bulb that contains the mercury. On the casting that holds the thermostat is a hole about 3/8ths of an inch wide by about an inch or so deep. It is only about an inch away from the take-off point where the line to the temperature gauge is connected to the head just behind the thermostat. I filled this hole with water while the engine was running, with the Bosch gauge showing 240 degrees. After waiting a minute for the water in that hole to reach the same temperature as the motor, I put the meat thermometer into the water. It read 165 degrees. Then I immersed the bulb at the bottom of the candy thermometer in the water in that hole and it read a steady 180 degrees, which it should inasmuch as the new thermostat opens at 180 degrees. So, would any of you care to comment on whether my method proved that the Bosch gauge is reading about 60 degrees to high? Thanks in advance.
 
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MSD
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PostPosted: Wed May 23, 2018 7:48 pm    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

Put the gauge end in some warm water and see what it reads and then put your other thermometers in it at the same time and see what the difference is. Might be more accurate than what your trying to do.
 
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Walter Buller
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PostPosted: Thu May 24, 2018 3:54 am    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

I'll try that. Thanks
 
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Frankinfl
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PostPosted: Thu May 24, 2018 6:01 pm    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

You can use boiling water to test. Water boils 180 degrees. Make sure the bulb is suspended in the water and not touching sides or bottom.
 
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DoubleO7
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PostPosted: Thu May 24, 2018 6:28 pm    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

CVPost-Frankinfl wrote:
(quoted from post at 22:01:38 05/24/1Cool You can use boiling water to test. Water boils 180 degrees. Make sure the bulb is suspended in the water and not touching sides or bottom.


Umm, you would have to be higher than any mountain in the lower 49 states to boil water at 180 degrees.
But.......test all of the gauges in boiling water to see how they compare. My bet is on the candy one being the most accurate.

I would say the gauge or the sender (if it has one) is faulty.
 
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tractorguy2
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PostPosted: Fri May 25, 2018 6:05 am    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

Water boiling point is not 180. It's 212.
 
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Walter Buller
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PostPosted: Fri May 25, 2018 7:05 pm    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

I immersed both thermometers and the gauge sensor in a pot of hot water. All three read close to the same temperature. Actually the candy thermometer and the Bosch sensor read the same, 175 degrees. I cranked the motor while the sensor was still outside the casting where its inserted, and created a geyser of water and coolant, so that told me the new water pump was working fine. Then I reinstalled the sensor or probe, removed the radiator cap, cranked the motor and waited until the Bosch temperature gauge was reading close to 200 degrees, plenty warm enough for that 180 degree thermostat to have opened, yet I saw very little coolant trickling through the radiator vanes on the way to the bottom hose. So I removed the new thermostat altogether and replaced it with nothing. I purposefully left the radiator coolant level about 5" low. On a one hour trip the next day pulling an empty dual axle 8 x 16 utility trailer, the Bosch gauge only went up to 209 degrees. On the return trip with about a 7000# John Deere loader tractor on board, the temperature indicator still did not go above 209 degrees. This morning before leaving for about an hours worth of mostly city driving, I filled the radiator to the top with coolant. The highest reading I got on the Bosch gauge was about 159 degrees. When I returned the new thermostat to O'Reilly's, the girl said that this thermostat was not the right one for a 12v Cummins motor. But I decided to not go through the hassle of changing the thermostat again so I'm just going to drive without one until winter sets in. I would hold O'Reilly's liable for any damage to my motor but I haven't noticed any. Still runs and sounds the same.
 
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504
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PostPosted: Fri May 25, 2018 7:24 pm    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

Put the thermostat back in,it slows the water down and helps keep the air out of the system. Air will ruin the motor(cavitation) Every pound of PSI on the cooling system lowers the boiling point 7 deg. My Freightliner runs over 200 deg most of the time and has for 292000.0 miles so far.
 
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willie in mn
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PostPosted: Sat May 26, 2018 10:12 am    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

Someone gave you bad info. Every pound of pressure RAISES the boiling point 3 deg. It also lowers the freezing point, but I don't remember how much.

Willie
 
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MSD
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PostPosted: Sat May 26, 2018 4:40 pm    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

Tough to find a good thermostat. About like condensers. We have used the actual Cummins one's and still not had good luck with them. Keep trying till you get a good one I guess.
 
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SVcummins
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PostPosted: Sat May 26, 2018 10:48 pm    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

Buy a cheap infrared thermometer and then you can run down the road awhile till the gauge reads hot and see what the infrared thermometer says
 
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David G
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PostPosted: Sun May 27, 2018 7:27 am    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

Number 1, put the right thermostat back in, 180 is too cold for that engine.

Number 2, check the gauge.
 
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PopinJohn
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PostPosted: Sun May 27, 2018 3:40 pm    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

I had a similar problem with a 1973 Mercury Capri that I had bought
at a used car lot. Temp gauge read around 250 deg.
Installed a new thermostat that looked like the 180 deg one that
came out. Looked similar to V8 Chevrolet. Wrong!
The V6 engine was supposed to have a bypass type thermostat
made similar, but smaller, that the t-stat found in Detroit?s.
Finally got a correct one and temp ran 195 or so.
 
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Walter Buller
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PostPosted: Mon May 28, 2018 10:39 am    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

Right. Pressure raises boiling points. Neither do I understand how a thermostat could help keep air out of the motor. Or why that would even be a good thing if it could. As far as 180 degrees being too cool, why would that be? My old "93 Cummins Dodge dually has about a half million miles on it, and it has always maintained an engine temp. of about 160 degrees unless I am pulling something. Then it might go up to 210 or thereabouts depending on the weight and terrain. Besides, as engine temperature goes up, viscosity goes down, reducing the load carrying capacity of the crankcase oil, therefore reducing the ability of the oil to protect the engine. Is my reasoning incorrect?
 
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SVcummins
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PostPosted: Mon May 28, 2018 5:37 pm    Post subject: Re: Bosch Temperature gauge.inaccurate? Reply to specific post Reply with quote

180 is fine . Your wrong on viscosity as the temp goes up on multi viscosity oils the oil changes to the 40 weight instead of the 15 if You ever send a oil sample in they will send you a report and part of that report is what the oils viscosity is at certain temperature I don?t have any handy but I?ve never had one come back that wasn?t around 40 viscosity
 
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