Thread: Adding Cylinder head temparature sensor location

I mounted mine on one of the bolts on the thermostat housing. Has no relation to the standard one. This one tells ya what temp ya coolant is, the std one tells ya umm. Im not sure really what it tells ya but its not ya coolant temp.

Dave

Originally Posted by SouthOz

I mounted mine on one of the bolts on the thermostat housing. Has no relation to the standard one. This one tells ya what temp ya coolant is, the std one tells ya umm. Im not sure really what it tells ya but its not ya coolant temp.

Dave

How did you fit it? Any pics mayne?

Thnx

Engine Guardian

Dave

Assuming you're talking about a 300TDI? Here is where I bolted mine on. There was a spare M8 thread there.



Edit: The blue heat shrink.

Originally Posted by Judo

Assuming you're talking about a 300TDI? Here is where I bolted mine on. There was a spare M8 thread there.



Edit: The blue heat shrink.

Exactly what I was after! Thanx! 300 tdi yes. How do you find the accuracy of it?

Sent from my GT-I9300 using AULRO mobile app

Originally Posted by ROAMER_AUS

Exactly what I was after! Thanx! 300 tdi yes. How do you find the accuracy of it?

Sent from my GT-I9300 using AULRO mobile app

They only measure the temp at the point where the sensor is so it in itself is almost irrelevant - certainly not directly (indirectly yes) linked with coolant temp - what you are looking for is noting a base line temp ad observing changes to that baseline.

To set up you need to take the vehicle for a long drive to get the engine operating at its normal operating temperature. On my V8 the water temp is about 95 degrees but my Engine Saver shows 71 degrees so this is my baseline temp. In driving it stays there on a 20 degree day but water temp goes up to 100 and down to 90 depending on load but the Engine Saver stays the same. I have set my alarm at about 85 so that it will sound if there is an issue with cooling and this heat starts to transfer to the engine metal. On cold Canberra winter days the Engine Saver sits on about 68 and on hot summer days it might go to 74. If it gets about 75 I start watching things a little more closely - water temp may still be between 90 and 100.

Usually, temp rises are normally when stopped at lights on a hot day with little fresh air coming into the engine bay and the engine fan is pulling hot air from the radiator and heating the externals of the engine and the sensor.

The crucial thing is not so much the absolute temps being displayed but knowing how they respond to varying circumstances. You quickly learn what is normal and what is not as long as you have determined your baseline temp correctly.

I hope your model has a low coolant alarm inbuilt with its own sensor.

Garry

Well so far I've had a completely different experience to Garry in terms of numbers. Perhaps the difference between a V8 and TDI. What is the temp rating of the thermostat in a V8?

I installed mine not long ago during winter, so I can only comment for driving during very mild weather. The coolant temp and head temp go up and down mostly in sync except the coolant is about 2*C higher. Head temp varies between 88*C - 93*C so far, but again - this is winter driving only. Once the engine is up to operating temp, it will never be below 88*C.

I do however, agree 100% with this:

Originally Posted by garrycol

The crucial thing is not so much the absolute temps being displayed but knowing how they respond to varying circumstances. You quickly learn what is normal and what is not as long as you have determined your baseline temp correctly.

I have just (last weekend) mounted a couple of sensors on my defender 300tdi, one on the thermostat housing and one in the same place as where Judo has put his on the cylinder head. Haven't been able to do a big run to establish a baseline yet, but so far going to and from work and small errands locally around home, I have noticed that the coolant temp is usually about 5 degrees lower than the engine temp. Highest the donk has got up to so far is 86 degrees, but I only live about 7km from work, so it is not much of an indication. Also fitted a low coolant alarm. Hopefully will get to do a decent run this weekend to establish a baseline, and will then set alarm temps from there.