Thread: Engine Watchdog TM2 on gearbox

I assume this would be the second sensor for the defender? i.e. you already have the first one on the engine block?

If so, IMHO, there are a few options, you could place the second one in another location on the block so you are monitoring in essence the block water jacket temp and the oil temp (or the area downstream from the water pump), or on the transfer case (more likely to be working hot than the gearbox if you are choosing the right gear IMHO).

Originally Posted by EchiDna

I assume this would be the second sensor for the defender? i.e. you already have the first one on the engine block?

If so, IMHO, there are a few options, you could place the second one in another location on the block so you are monitoring in essence the block water jacket temp and the oil temp (or the area downstream from the water pump), or on the transfer case (more likely to be working hot than the gearbox if you are choosing the right gear IMHO).

That's right. The first one is on the engine block, and I have a spare.
The transfer case is an option. Is the transfer case ever likely to get so hot that damage will occur? I don't think I'll bother with two on the engine. I have a few tractors. I could put it on one of them.

You already should have a circuit for a TC temp sensor if your defender is post 96. If you haven't, you can retrofit from a later wreck rather than wasting the watchdog (Unless you really want the extra dohickeys).

Originally Posted by langy

You already should have a circuit for a TC temp sensor if your defender is post 96. If you haven't, you can retrofit from a later wreck rather than wasting the watchdog (Unless you really want the extra dohickeys).

Thanks Langy, but I don't quite get it. What is "TC"? Traction Control? What is this temp sensor there for? Can you or someone else explain this a bit further? Mine's a '96 130.

Originally Posted by wally

Thanks Langy, but I don't quite get it. What is "TC"? Traction Control? What is this temp sensor there for? Can you or someone else explain this a bit further? Mine's a '96 130.

TC : Transfer Case.
If your box is a manual then there is probably no point.
I have a temp guage for my gearbox but that is because it's an auto.

Originally Posted by George130

TC : Transfer Case.
If your box is a manual then there is probably no point.
I have a temp guage for my gearbox but that is because it's an auto.

"Transfer case". Yes, the very thing we were only just talking about. How embarrassment. I do apologise for my blonde moment.

So why do post 96 Defenders have a temp sensor on the transfer case if there was no gauge or warning light associated with it? And why was it deemed necessary?

When you turn the ignition on there should be three indicator lights come on - charge, brakes and a temp symbol within a cog symbol. This is the TC overtemp indicator. In an auto, there is a 2nd temp switch wired into the same circuit.
Your defender should have this circuit - look at the passenger side of the transfer case - there should be a temp swtich screwed into the side of TC and wires leading into the loom that services the speedo input.

Originally Posted by langy

When you turn the ignition on there should be three indicator lights come on - charge, brakes and a temp symbol within a cog symbol. This is the TC overtemp indicator. In an auto, there is a 2nd temp switch wired into the same circuit.
Your defender should have this circuit - look at the passenger side of the transfer case - there should be a temp swtich screwed into the side of TC and wires leading into the loom that services the speedo input.

I didn't know I had a temp; warning for the transfere.
The things you learn.