Thread: SII petrol discovery temperature sensor

I'm am not familiar with the V8's but this is from the Rave CD....

Inlet manifold - Cooling connections
Coolant leaves the cylinder block via an outlet pipe attached to the front of the air intake manifold. The pipe is
connected to the thermostat housing and the radiator by a branch hose off the radiator top hose.
Hot coolant from the engine is also directed from the inlet manifold via pipes and hoses into the heater matrix. Coolant
is circulated through the heater matrix at all times when the engine is running.
A further tapping from the inlet manifold supplies coolant to the throttle housing via a hose. The coolant circulates
through a plate attached to the bottom of the housing and is returned through a plastic bleed pipe to an expansion
tank. The hot coolant heats the air intake of the throttle housing preventing ice from forming.
An Engine Coolant Temperature (ECT) sensor is fitted in the inlet manifold adjacent to the manifold outlet pipe. The
sensor monitors coolant temperature emerging from the engine and sends signals to the ECM for engine
management and temperature gauge operation.



You can get these from the Market Section....they are brilliant

On my Thor manifold, the sensor sits on top of the front of the manifold, just behind the water outlet pipe. If the water was low , I guess it would not be covered.
Regards Philip A

Thanks Guys I'll have a look and let you know but the sitting too high option sounds feasible

Originally Posted by PhilipA

On my Thor manifold, the sensor sits on top of the front of the manifold, just behind the water outlet pipe. If the water was low , I guess it would not be covered.
Regards Philip A

Same problem exists with 300Tdi. The gauge may even drop, as the coolant no longer covers the probe when levels are low

Fitting a low level warning gauge/ buzzer will protect these engines.

JC

Thanks Philip - it is all starting to make sense now. Ever since I bought the vehicle it would slowly lose coolant. I assume it simply leaked out the overflow or from one of the myriad of radiator hose joins, but nonetheless every couple of months I had to put in a litre or so of coolant. When it cooked I am pretty sure it had been a while since I had added any coolant and it may have been a little low. That said there was still plenty of coolant there as when it blew a hose (as a result of compression gases leaking into the water jacket when the head gaskets went) coolant went everywhere.
I'll have to figure out a way to get a sensor mounted lower in the engine's water table (and hope the mechanics who put it back together have used enough gasket goo to seal any water leaks from the hoses).

A litre over a couple of months is not a slow leak. There will be coolant tracks everywhere from the leak area, unless its the dreaded loose sleeve.
I suggest that a coolant level indicator on the header tank may be a help. My old 92 Range Rover Classic has one, and it will indicate before anything when the coolant is low.
There is somone on this forum who sells them.
Regards Philip A

Thanks again - I don't recall seeing great coolant tracks everywhere which is why I suspected the overflow. I may have overstated the quantity but not by much - I had to top up the header tank every couple of months. The sleeves?? Do you mean the cylinder sleeves? Hopefully if that is the issue the mechanic would have picked it up when the heads were off? Isn't just so tempting to drop a big block turbo diesel in?

For anyone interested in this thread I contacted

David Jones
Enginesaver Low Water Alarms
Ph\Fax 0747766334
Mobile 0427159668
enginesaver@bigpond.com

who operates his business from FNQ. He makes in-line and under hose units and has some deal going at the moment with this site (see banner at top). I ordered a unit yesterday for $150 including postage and I am told it is in the post today. I'll post another message once I get it as to the units quality etc

Cheers