Is there a normal operating temperature for a 1HZ motor in a 1995 troopy?

Submitted: Wednesday, Jul 01, 2009 at 11:47
ThreadID: 70296 Views:10071 Replies:8 FollowUps:4
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I have just finished putting the TM-2 Watchdog in the troopy.

I took it for a run and the temperature got up to 63 degrees, however when I got back to the 50 kph zone it went up to 73 degrees. Is this normal?

Perhaps ignorance is bliss, and I should have left the watchdog off. LOL
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Reply By: Atta Boy Luther - Wednesday, Jul 01, 2009 at 12:04

Wednesday, Jul 01, 2009 at 12:04
No idea but where on the firewall did you run the wire ? I am thinking of getting a TM2 . Where did you put the sensor ?
AnswerID: 372614

Follow Up By: Member - Boo Boo (NSW) - Wednesday, Jul 01, 2009 at 12:42

Wednesday, Jul 01, 2009 at 12:42
I ran the wire through the grommet up the top of the fire wall on the air cleaner side. Its the one in the top right hand corner as you sit in the drivers seat.

I found it easier to push a piece of wire through from the engine bay side, tape it to the sensor wire and carefully pull it back throught to the engine bay.

I put the sensor on the second to last rocker cover bolt on the intake side (Passenger side).
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FollowupID: 639841

Reply By: Member - Scooby (WA) - Wednesday, Jul 01, 2009 at 12:49

Wednesday, Jul 01, 2009 at 12:49
Hi Boo Boo,
Where have you mounted the thermocouple? On my Hilux with the 5L diesel motor and the thermocouple under the bolt of the thermostat cover I get between 85 and 95 degrees. It depends on how hot the air temp is and how hard the motor is working.
Regards
Scooby
AnswerID: 372621

Reply By: Member - Vic S (VIC) - Wednesday, Jul 01, 2009 at 14:21

Wednesday, Jul 01, 2009 at 14:21
I think thermo couples are meant to be mounted as close as possible to the rear of the head ?not rocker cover.normal operating temp (water) is usually just below boiling ie 100 degrees as coolant takes it to about 105 - 110
Vic
AnswerID: 372633

Follow Up By: 120scruiser (NSW) - Wednesday, Jul 01, 2009 at 20:33

Wednesday, Jul 01, 2009 at 20:33
Try the pressure from the radiator cap increases the boiling point.
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FollowupID: 639927

Follow Up By: ian zzr - Wednesday, Jul 01, 2009 at 22:42

Wednesday, Jul 01, 2009 at 22:42
approx about 1 degree per lb pressure of cap but this does"nt mean put a higher pressure cap on but then you take in altitude as this changes pressure slightly, but dont change your cap to a higher pressure, what you have from standard is best, and should be tested as well.
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FollowupID: 639951

Reply By: Member - ross m (WA) - Wednesday, Jul 01, 2009 at 15:10

Wednesday, Jul 01, 2009 at 15:10
I have mine connected to the forward bolt on the upper coolant outlet.
Its gets from 68c coasting down a 3klm hill in 5th and up to 94 in low range 4wd in summer.
Most of the time for trips around town,it sits in the 78 to 84c range.
It goes up a couple of degrees after shutdown.

Its not meant to be an accurate temp gauge ,but rather an indicator to tell you when things are getting critical

Thermostats open at about 88c,so I imagine Im within a cooee of operating temp.
AnswerID: 372638

Follow Up By: happytravelers - Wednesday, Jul 01, 2009 at 20:42

Wednesday, Jul 01, 2009 at 20:42
I agree, I have mine on the same bolt and the temp ranges from low 70 s to high 80 s. 94c is the highest reading so far up a long hill, so I've the alarm set at 95c. Very interesting watching it on a long steady run as you can see the thermo fan cutting in and out via the temp. reading.

Regards Jon
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FollowupID: 639929

Reply By: Member - Phil G (SA) - Wednesday, Jul 01, 2009 at 19:55

Wednesday, Jul 01, 2009 at 19:55
Your thermostat opens at 78 degrees C and is fully open at 90 degrees C.

The TM2 sensor is best on one of the top water outlet bolts as it is alloy, and should reflect the water temperature.
I installed a TM2 last weekend on my daughter's 1Hz but don't have a feel for the temperatures yet.
AnswerID: 372678

Reply By: get outmore - Wednesday, Jul 01, 2009 at 19:59

Wednesday, Jul 01, 2009 at 19:59
I think you will find the factory gauges are desighned to move as little as possible - it worries people (like you found out) that the engine temps DO vary
unlike your tojo gauge which gos to 1/2 2 minutes after you start driving and stays there unless its just about to boil
AnswerID: 372679

Reply By: Member - Chris & Debbie (QLD) - Wednesday, Jul 01, 2009 at 20:42

Wednesday, Jul 01, 2009 at 20:42
Boo Boo, if it is running around those temperatures you will probably find your thermostat needs replacing, or more likely it does not have one if running that low.
As was mentioned the thermostat should open around 80°C, therefore, the minimum your engine should run at.
Chris
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AnswerID: 372692

Reply By: Member - Boo Boo (NSW) - Thursday, Jul 02, 2009 at 10:05

Thursday, Jul 02, 2009 at 10:05
Thanks everyone for the info.

I'm heading for Emerald in about 1 hour and I'll see what the gauge does.

Although I think the that maybe I will get back and have the thermostat looked at.

AnswerID: 372744

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