Thread: Disco 300Tdi EGT sensor

That does not appear to be a stock 300tdi hairdryer.
Is that water and oil cooling i can see to the centre of the unit?
Is it a TD04 turbo? There was a kit a whiles back...

With respect to EGT there is a blanking plug post turbo in the exhaust dump.
But I would do as you say and drill tap the manifold. May need to pull the turbo/ manifold off to assess best location.

S

Enclosed is a pic where mine is.

It is oil lubed and water cooled, which after looking at others on here, is definitely a mod.

I plan to turn the stock IC into a water radiator and change to a water/air intercooler, but I want to know what's going on temp wise first. Don't want to spend too much (eg keep manifold and existing turbo on).

If you have a vacuum cleaner that can blow, push the hose up your tailpipe to create air pressure in the exhaust. Then dry drill and tap the boss, and wear safety specs as cast iron shavings will spray everywhere.

"Don't want to spend too much (eg keep manifold and existing turbo on)."
One thing I have learnt in mechaniking is that aiming to take short cuts usually ends in a long cut.

Beeutey it would take me longer to negotiate with the ruler of the vacuum cleaner than rattle off a manifold and exhaust - Besides that exhaust dump pipe looks easy and a couple of oil/water lines.

Id pull the hairdryer so you can see where the EGT probe can be inserted to be in the centre of the gas flow. No point measuring if it is in some back eddy????

Steve

Yeah, I hear you. Not worth risking debris getting into the hairdryer and beyond!
Steve, by exhaust dump pipe, do you mean the pipe bending down at the front left - to the exhaust? Do you think this is fine for an egt reading?
And what did you mean by a couple of oil/water lines?

If manifold not leaking and everythingworking just dandy, I drill and pressurise also.
Than again I don't work on cars all day but have seen some stripped bolts on exhausts and heads.

Alternatively, book your next service and get your mechanic to do it.

From memory, I had mine done same time as gas and Bee utey did perfect job. He probably did pressurise the manifold and it must work than.

The dump pipe is that cast 90 degree elbow at the front with the four bolt flange at the turbo, then going down to the exhaust. It looks like a threaded plug is is already in place (yellowish colour lateral face). You can measure EGT post turbo but it is not as accurate as pre turbo.

Looking at that inlet manifold, I would remove it to work out where the gas flow goes. You can see the 4 bolt flange directly beneath the cast collector, this is a long way from the angled face. Unless you can see where the probe tip is you wont be certain it is in the gas flow from the collector down to turbo. If its not in the gas flow you may as well just put the probe post turbo.

The exhaust manifold is probably leaking anyways! Just take it off! And besides you will also have the inlet manifold off and can drill/tap it for an accurate boost measurement.

With regards to oil/water lines. Im guessing but the little braided line in picture looks ot be oil feed from the block, the larger braided line is my guess water feed from cooling system - probably straight from radiator cool side. Obviously if you have two feeds you wil also have two returns. They will be 'under' the centre section of the turbo. Oil return to sump and water return to some special place!! To remove the turbo/manifold you will need to remove these lines. If it was me, Id soak those four nuts/bolts at the turbo to dump flange. Then it will be the 8 manifold bolts, the 4 flange bolts and the oil and water. In the time it has taken to write this message I reckon I would have got the thing off already!

S