Coolant flow direction

Header tank pumping up aggressively from the back rear bottom connection? This doesn't seem right?

You can see the blue coolant being pushed up the top of the tank in this pic

That's definitey not right, what happens if you remove the cap ?

With the cap removed It still flows up and over! The egr cooler is removed and the two pipes have been connected together. If this has any effect but this was done 3 years ago. I have just replaced the tank and coolant so maybe now it's just visible as the old tank was filthy

So the pipe on the bottom back of the header that's pumping up is connected via a rubber hose to the solid metal pipe under the inlet which I belive comes from the oil cooler?

robhtid said:

So the pipe on the bottom back of the header that's pumping up is connected via a rubber hose to the solid metal pipe under the inlet which I belive comes from the oil cooler?

Click to expand...

Yes that pipe was through the EGR cooler initially and now being connected together goes directly to the oil cooler, it's normal to be a SLIGHT return flow on that pipe but i've never seen such thing as the level in the tank to not be even in the two chambers of the tank due to high pressure there... on some modells that circuit is completely missing as that port of the oil cooler is blanked, that's why they sell these https://twinwoods4x4.co.uk/product/td5-oil-cooler-blanking-plug/ and the tank has no hole there... maybe you should do that but the coolant circuit in the oil cooler might be clogged one side so the pressure goes mainly in that port which is not OK

Ok thanks I'll look again removing the oil cooler if possible and blow it through/soak it before I blank it. Thanks for the help

Welcome. I presume that you realised that you'll have to blank the tank too on that port then you can remove the whole pipe from there

sierrafery said:

Welcome. I presume that you realised that you'll have to blank the tank too on that port then you can remove the whole pipe from there

Click to expand...

Easiest to replace the tank with an EU2 one https://twinwoods4x4.co.uk/product/expansion-tank-d2-less-eu3/

sierrafery said:

Welcome. I presume that you realised that you'll have to blank the tank too on that port then you can remove the whole pipe from there

Click to expand...

Hello again. Sorry I've been working away and haven't had chance to look at this much further but I've just got back and had 15mins looking and checking some diagrams.

So am I right in saying that the oil cooler gets it feed from an internal waterway in the engine and also has a separate return back into the engine and the take off that is sometimes blanked was just to circulate the egr cooler? With blanking this off the oil cooler still has a circulation and isn't just a dead end?

My other thought and after looking at various diagrams is the egr cooler flow direction that leaves the oil cooler and goes through the egr then goes in to the bottom left of the rad second spigot up. I could connect the pipe into this instead of blanking and completing a circuit and aiding flow?

Thanks

robhtid said:

am I right in saying that the oil cooler gets it feed from an internal waterway in the engine and also has a separate return back into the engine

Click to expand...

YES, the oil cooler works perfecly blanked there... to simplify, that port which can be blanked is useless once the EGR was bypassed...period

robhtid said:

My other thought and after looking at various diagrams is the egr cooler flow direction that leaves the oil cooler and goes through the egr then goes in to the bottom left of the rad second spigot up. I could connect the pipe into this instead of blanking and completing a circuit and aiding flow?

Click to expand...

On an EU3 TD5 (and basically any EU2 TD5 that's had the radiator replaced) that connection on the radiator is blanked internally, so it's not going to do anything. As Fery said, just blank it at the oil cooler and the expansion tank (or fit an EU2 tank).

Ok thanks. I have a large core Ali rad with the secondtake off so was just wondering about utilising it but I will just blank it. Thanks