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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

diesel engine temp

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double d

08-03-2005 20:54:24




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Does anyone know the max engine temp before damage occurs, mine wants to run at 230 on a hot summer day but it is not boiling over it is an 85 model komatsu, any help would be appreciated.




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RAB

08-03-2005 23:30:04




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 Re: diesel engine temp in reply to double d, 08-03-2005 20:54:24  
Who or what says it is 230? Verify accuracy before getting in a tizz. If it has antifreeze mixture and a good pressure cap it will not boil for quite a few degrees yet, even if correct.
If the temperature cycles around that reading, it may be thermostat full open temperature.
Does it have a cab heater? If so, what happens if you use that extra heat dissipation?
I presume you have a clean radiator, inside and out, properly tensioned fan drive belt in good condition.
What is the oil temperature? That can be doing a lot of cooling duty as well.
Even if it was at that temp it should not cause any damage, provided a good lubricant is present at an appropriate flow (design pressure) and it is not boiling. Just a few degrees (10 F?)higher than design. Just check it out accurately and find the problem, if there is one, before it progresses further.
Regards, RAB

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double d

08-04-2005 04:25:08




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 Re: diesel engine temp in reply to RAB, 08-03-2005 23:30:04  
Thanks,hopefully I don't have a problem,all the check points you mentioned are in working order, new water pump,fan belt,clean rad/in &out,oil cooler filter clean,new 172 thermostat,2nd new temp gauge,the point of measure is in the thermostat housing,I get a 25deg. difference from the the fluid in the top of rad/vs what the gauge reads.A diesel shop ran a heat gun across rad with an average of 25 deg less than what my gauge reads also. I have no cab heat. The temp does cycle from 230 full load down to 190/200 idling so my gauge is working,I just may have bought two new gauges out of calibration.

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RAB

08-04-2005 12:53:15




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 Re: diesel engine temp in reply to double d, 08-04-2005 04:25:08  
You could always check out your sensor/guage. Remove, immerse in boiling water. If as I expect it is the thermistor type and you have just purchased a second one, it could be your gauge. You possibly have a voltage regulator for the feed for the guages which is slightly off. So many possibilities for temp guages to read wrong, so I just use them as an indication, not an absolute value.
Regards, RAB

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double d

08-04-2005 21:16:36




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 Re: diesel engine temp in reply to RAB, 08-04-2005 12:53:15  
yes, you are right, I just had a mechanic check my thermostat housing with a heat gun and it was 20deg. lower than my gauge readout,which means the max I am running has been 210 on the hottest day under full load which should be safe for late model engines,thanks for your help.



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