engine watchdog sensor placement 4.5LTDV8

Submitted: Sunday, May 24, 2009 at 19:14
ThreadID: 69136 Views:2294 Replies:8 FollowUps:10
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I have a TM2 engine watchdog on my LC tray back 4.5LTDV8 and trying to ascertain the best place to put the sensor ..that is on the head or the block and where?

I have moved it around a few spots and not that happy that I am getting a reading that is either sensitive enough or in the right place so I can react to the warning if and when

Has anyone placed one of these on this engine and if so where exactly ....(exactly what bolt?).......(not easy to find a place so far), secondly what are the running temps you are getting in your chosen sensor spot?

Thanks in advance
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Reply By: Member - John and Val W (ACT) - Sunday, May 24, 2009 at 19:41

Sunday, May 24, 2009 at 19:41
Hi,

Not directly relevant to your engine, but I fitted mine to the back of the engine block away from the exhaust manifold on my old 75 series Troopy. On my engine there is a lifting hook there firmly anchored to the block, so good thermal contact. Others have attached the sensor to the thermostat, but I reckoned that if I lose coolant, there'd be no circulation reaching the thermostat, so attaching to the block was better than to the thermostat.

The sensor responds quite slowly, which is probably intentional and ok unless you have a sudden major leak. My running temperature is surprisingly low - typically in the low 60's deg C, and up to 70 deg after a workout. As an alarm, I think it's fine, so long as the trip point is set a little above the highest likely operating temperature at that point on the engine. I doubt that actual placement is important - we are looking for out-of-the-ordinary temperature at the sensor, wherever it is.

HTH

John
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AnswerID: 366523

Reply By: Richard Kovac - Sunday, May 24, 2009 at 19:55

Sunday, May 24, 2009 at 19:55
bungarra

mine is only on a six cylinder but check out my blog.

AnswerID: 366528

Follow Up By: Richard Kovac - Sunday, May 24, 2009 at 19:57

Sunday, May 24, 2009 at 19:57
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Follow Up By: Member - Graham H (QLD) - Sunday, May 24, 2009 at 20:33

Sunday, May 24, 2009 at 20:33
Copycat. Thats the same bolt mine is on.

Are we both lazy as thats the most accessible one.

Mine runs at 78-82 towing the van.




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Follow Up By: Richard Kovac - Sunday, May 24, 2009 at 23:26

Sunday, May 24, 2009 at 23:26
Graham Lazy I think.

Haven't tried towing but runs around 75-76 all day.

Cheers

Richard
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Follow Up By: Member - Graham H (QLD) - Monday, May 25, 2009 at 08:53

Monday, May 25, 2009 at 08:53
Not really Seemed to be the easiest place to put it so the wires dont run too close to the motor.
Cheers




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Follow Up By: Richard Kovac - Monday, May 25, 2009 at 20:02

Monday, May 25, 2009 at 20:02
Graham

I did not mean you lazy, I ment me took me 2 1/2 months to fit.

Richard
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Follow Up By: Member - Graham H (QLD) - Monday, May 25, 2009 at 20:41

Monday, May 25, 2009 at 20:41
Dont worry I didnt think you did.

I just meant we bolted it to the easiest place possible which is probably the best anyway as residual under bonnet engine heat wont affect it.
As long as they work Ok I guess.
Cheers
G
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Reply By: Member - The Crow (QLD) - Monday, May 25, 2009 at 06:32

Monday, May 25, 2009 at 06:32
I don't have one of these units on my Cruiser but I have a Scangauge 11 unit fitted and it reads the temp. Mine sits on 80Deg when towing and between 78 & 80 when normal cruising conditions.
200 Series V8 Diesel
Thanks for the Rest Flying West and Flying Very Low along the track not coming back. The Crow

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AnswerID: 366563

Reply By: Member - Alan H (QLD) - Monday, May 25, 2009 at 06:52

Monday, May 25, 2009 at 06:52
On my 200 series I use a scanguage which says that the computer is reading a water temp of 80. It does rise on a pull up a range but quickly goes back to 80.

Alan
AnswerID: 366564

Reply By: Member - bungarra (WA) - Monday, May 25, 2009 at 08:11

Monday, May 25, 2009 at 08:11
Thanks for those replys. I have the scanguage fitted and as the posts have said it is reading the coolant temp and mine is similar to those readings posted.

The reason for fitting the watch dog is that it will alert to a rise in engine temp long before the coolant temp causes the guage to rise and then you have to hope you notice it

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Follow Up By: Member - Graham H (QLD) - Monday, May 25, 2009 at 08:51

Monday, May 25, 2009 at 08:51
The reason the gauge doesnt alter soon enough is tha it has what could be described as a flat spot and doesnt move unless temp goes up more than about 10deg.

If you get a hole in the radiator or split a hose and drop all the fluid
IT DOESNT MOVE AT ALL

cos it only works when immersed in liquid.

Thats why a good digital temp gauge is well worth the money.
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Follow Up By: Member - bungarra (WA) - Monday, May 25, 2009 at 09:22

Monday, May 25, 2009 at 09:22
HI Graham H

You are spot on that these OEM guages have a flat spot...in fact a big one of I think more than 10 deg.

I have the scan guage fitted and monitoring the coolant temp and when compared to the OEM guage it is a little alarming at how little it moves compared to the actual coolant temp as shown on the Scanguage

That is the reason I have both a Low Coolant alarm fitted and the Engine watch dog...It is the watchdog sensor placement that I am trying to find a good place for the sensor on this particular engine...it does give an audible alarm above the set temp...far better than watching a guage

cheers
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Follow Up By: Member - Graham H (QLD) - Wednesday, May 27, 2009 at 18:31

Wednesday, May 27, 2009 at 18:31
Anywhere you can find a bolt that fits and is actually on a head or the block.
'The metal temp will be fairly similar all over but possibly a head will be a better place as it will be the first to lose coolant.
I also have the low coolant alarm.
Cheers




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Reply By: Member - Trouper (NSW) - Monday, May 25, 2009 at 18:43

Monday, May 25, 2009 at 18:43
where do you buy the TM 2 wtchdog from????

Cheers
Jeff
AnswerID: 366658

Follow Up By: Member - Graham H (QLD) - Monday, May 25, 2009 at 19:10

Monday, May 25, 2009 at 19:10
www.enginesaver.com.au










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Reply By: Member - Trouper (NSW) - Wednesday, May 27, 2009 at 18:17

Wednesday, May 27, 2009 at 18:17
THanks Graham will check it out

Regards

jeff
AnswerID: 367021

Reply By: _gmd_pps - Wednesday, May 27, 2009 at 18:45

Wednesday, May 27, 2009 at 18:45
don't have the cruisers or patrols coolant level alarms built in ?
I thought this is pretty much standard by now.
Surely the ECMs must have that info.

have fun
gmd
AnswerID: 367024

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