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Join Date: Dec 2004
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Thermostat working?

On a freshly rebuilt 2.7 S, how long should it take for the engine to reach operating temp (say 180 degrees) if the thermostat is working properly? It seems that even after 15 minutes or more, the engine is still warming and never reached 180 on a 78 degree summer evening.

The temp sending units (there are two, one for the dash gauge and one for the ECU - its fuel injected now with ITBs) display within 5 degrees of each other.
Old 08-13-2018, 06:10 PM
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Quote:
Originally Posted by db9146 View Post
On a freshly rebuilt 2.7 S, how long should it take for the engine to reach operating temp (say 180 degrees) if the thermostat is working properly? It seems that even after 15 minutes or more, the engine is still warming and never reached 180 on a 78 degree summer evening.

The temp sending units (there are two, one for the dash gauge and one for the ECU - its fuel injected now with ITBs) display within 5 degrees of each other.
Won't reach much temp until some load comes on the motor,a good working thermostat will bring the temp up reasonable fast from idle but not to the temps you are mentioning unless you drive it.
Seems they don't fail often but in my case it wasn't hard to test it and it worked as designed.
Maybe yours isn't working correctly as my calibrated gauge shows temp after 10mins atleast.
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Old 08-25-2018, 10:56 PM
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Thermostat tests.......

Quote:
Originally Posted by db9146 View Post
On a freshly rebuilt 2.7 S, how long should it take for the engine to reach operating temp (say 180 degrees) if the thermostat is working properly? It seems that even after 15 minutes or more, the engine is still warming and never reached 180 on a 78 degree summer evening.

The temp sending units (there are two, one for the dash gauge and one for the ECU - its fuel injected now with ITBs) display within 5 degrees of each other.



DB,

You need to physically test and observe how they slide under thermal tests. Do they open fully or partially? Not until you have physically observed how they work, you will be just guessing or hoping everything is OK. Unfortunately, you can not rely on LUCK all the time for your troubleshooting. Test and confirm. A set of test result or data is more reliable to have and make your conclusion.

Tony
Old 08-26-2018, 06:59 AM
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20-30 minutes of soft driving warm up is not unusual to get to temp.

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Old 08-29-2018, 09:18 AM
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