Engine Temperature Sensor LOCATION

As per Graham H.

Any good solid connection directly in direct contact with the head or block.

The rocker cover on diesel 1Hz cruiser is plastic so no good at all. On the thermostat housing somewhere would be the best bet.

True but think about it the bolt into the head is metal is it not.

just doesnt give as good a reading as bolted direct against the metal of the head.

The thermostat housing is not as ideal as right on the metal on the head as well.

Guys, that's not the thermostat housing.
1Hz and 1HD-FTE have the thermostat coming off the lower radiator hose pipe behind the alternator - it is inside the block, not the head.

BTW, Dickybeach's 80series is a petrol!!
But in the diesels you have the choice between attaching it to the iron head or the alloy top pipe bolts. I've had it on both and the iron head is a bit slower to respond than the alloy pipe. But in the real world I don't think it matters.

Oh & with regards to where to fit it, the way I found best was to start with a cold engine & start her up. Put you hand on the various possible locations....the first one that is too hot to hold would be the best...

Just remember though that if you loose water, you want to still measure the engine temperature as much as possible....

My unit also flashes if the temp is below 50 degrees, but I have the sensor at the moment very close to the engine but still on the water inlet pipe.

Cheers

78-82deg towing 2850kg Highest its been was 90 on a very hot day on the Willunga Hill

Exhaust temp at the same time was getting over 500deg.

Vehicle 100ser TD with 3" exhaust and Safari Chip

PS you lose water a bolt gets loose.

Thanks Graham, I had 70 degrees registered at fast idle, I was a bit worried if I didn't have it located in a reasonable spot it wouldn't do its job. Initially I had it on the rocker cover & it was lucky to push 50 at slow idle & I could hold my finger on it still. Thats when I ran my finger around until I found the hottest bolt I could find that I could fit the sensor to.

I have set the alarm at 100 degrees for the testing phase, I don't what the wife to complain about the alarm going off till I know what temps to expect! I will be going into town tomorrow so I will get an idea after a 30km run at 100km/h.

Cheers

Temperature sat around
76 degrees on the flat @ 100km/h...
79 degrees around town @60
80 peaked whilst stationary then dropped
82 on short climb @ 100km/h which the auto changed out of overdrive to 3rd.

Cheers

Sounds about right

Just check your sensor hole size before nominating a bolt...I too have a tapped hole, but the bolt that fits that will not fit the sensor hole as that hole was too small.

Cheers

DB, what engine do you have?

Thanks StromyKnight, will do.

Phil - Engine is FZJ80 Petrol.

"Her's responds quicker, but I don't think that matters. "

- while water is circulating it'll quickly transfer heat from the cylinder head to the water outlet. If you suddenly lose water through a blown hose there's no water to transfer the heat - you have to wait fo it to transfer through the block.

For fastest response when you really need it, the sensor needs to be close to the source of heat - the cylinder heads.

The really careful ones amongst us have a low water alarm as well so know when that happens hopefully.

Cheers