Engine Temperature Sensor LOCATION

Submitted: Saturday, Apr 03, 2010 at 10:36
ThreadID: 77419 Views:5579 Replies:5 FollowUps:14
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A question for (#80) ‘Cruiser owners who have fitted the “Engine Watchdog” (#TM2) device:
To which part of the engine did you fit the Sensor, eg under a rocker cover bolt, or to some other part of the engine?

Is there a “best” locating position?

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Reply By: Member - Graham H (QLD) - Saturday, Apr 03, 2010 at 11:30

Saturday, Apr 03, 2010 at 11:30
Mine for a similar type is bolted to the side of the head just behind the thermostat


On a 100 there are two tapped holes there so just used one of them.

The rocker cover would not really be a good place to fix it



AnswerID: 411511

Follow Up By: Member - Allan B (QLD) - Saturday, Apr 03, 2010 at 11:33

Saturday, Apr 03, 2010 at 11:33
As per Graham H.

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

Cheers
Allan

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Follow Up By: Ozhumvee - Saturday, Apr 03, 2010 at 12:49

Saturday, Apr 03, 2010 at 12:49
The rocker cover on diesel 1Hz cruiser is plastic so no good at all. On the thermostat housing somewhere would be the best bet.
Peter
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Follow Up By: Member - Graham H (QLD) - Saturday, Apr 03, 2010 at 13:05

Saturday, Apr 03, 2010 at 13:05
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.



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Follow Up By: Member - Phil G (SA) - Tuesday, Apr 06, 2010 at 18:45

Tuesday, Apr 06, 2010 at 18:45
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.
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Reply By: Member - John and Val - Saturday, Apr 03, 2010 at 14:03

Saturday, Apr 03, 2010 at 14:03
On our FJ75 troopy there was a convenient bolt holding the lifting hook to the block near the back of the engine, opposite side to the exhaust manifold. I used that. They are commonly attached using the thermostat housing mounting bolts. I didn't like that option because if coolant was lost, transfer of engine temperature to the thermostat housing and sensor would be slow. I reckoned there'd be a quicker response if attached directly to the block.

Cheers

John
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AnswerID: 411524

Reply By: StormyKnight - Saturday, Apr 03, 2010 at 23:13

Saturday, Apr 03, 2010 at 23:13
Just fitted a temp sensor to the Prado, yet to see what temperature she normally runs at.

Out of curiosity, what temperatures are you seeing?

Idle, Cruise @ 100kph & under load?

Thanks

AnswerID: 411565

Follow Up By: StormyKnight - Saturday, Apr 03, 2010 at 23:17

Saturday, Apr 03, 2010 at 23:17
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
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Follow Up By: Member - Graham H (QLD) - Sunday, Apr 04, 2010 at 10:04

Sunday, Apr 04, 2010 at 10:04
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.
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Follow Up By: StormyKnight - Sunday, Apr 04, 2010 at 13:28

Sunday, Apr 04, 2010 at 13:28
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
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Follow Up By: StormyKnight - Monday, Apr 05, 2010 at 17:13

Monday, Apr 05, 2010 at 17:13
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
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FollowupID: 681747

Follow Up By: Member - Graham H (QLD) - Monday, Apr 05, 2010 at 17:40

Monday, Apr 05, 2010 at 17:40
Sounds about right




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Reply By: Member - DickyBeach - Sunday, Apr 04, 2010 at 14:18

Sunday, Apr 04, 2010 at 14:18
Thanks Everybody.

After almost climbing into the engine bay I located an unused (tapped) hole at the firewall end of the engine (LHS) just crying out to be used. All I need to do now is determine the size of the bolt and I'm on my way.

Cheers,
DB
AnswerID: 411621

Follow Up By: StormyKnight - Monday, Apr 05, 2010 at 17:15

Monday, Apr 05, 2010 at 17:15
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
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FollowupID: 681748

Follow Up By: Member - Phil G (SA) - Monday, Apr 05, 2010 at 21:39

Monday, Apr 05, 2010 at 21:39
DB, what engine do you have?
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Follow Up By: Member - DickyBeach - Tuesday, Apr 06, 2010 at 14:47

Tuesday, Apr 06, 2010 at 14:47
Thanks StromyKnight, will do.

Phil - Engine is FZJ80 Petrol.

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FollowupID: 681843

Reply By: Member - Phil G (SA) - Tuesday, Apr 06, 2010 at 18:34

Tuesday, Apr 06, 2010 at 18:34
DB,
Unfortunately everybody who replied thought you owned a diesel. I'd guess you might have got better answers if they knew what motor you had.

I've got my TM2 attached directly to the cast iron head. My daughters 1Hz has it attached to the alloy top water outlet bolt. Her's responds quicker, but I don't think that matters. they are agreat bit of gear.

Cheers
phil
AnswerID: 411856

Follow Up By: Mike DiD - Thursday, Apr 08, 2010 at 14:28

Thursday, Apr 08, 2010 at 14:28
"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.
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FollowupID: 682084

Follow Up By: Member - Graham H (QLD) - Thursday, Apr 08, 2010 at 15:50

Thursday, Apr 08, 2010 at 15:50
The really careful ones amongst us have a low water alarm as well so know when that happens hopefully.

Cheers

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FollowupID: 682097

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