TD5 Defender - EGR Question

bankz5152 · Dec 10, 2015

Looking through my engine bay I found what appears to be a redundant part of the EGR system. Its a solid pipe that runs around the back of the engine and finishes just below/behind the turbo into the oil cooler (if looking from the front).

To me it looks like this pipe could be remove and free up space in the engine bay also surely since its blanked off at source a tiny increase in performance?

Start of it is marked in red -

Also can all of this be removed and blanked off? If not what are they?

Referring to parts labelled 23, 1, 2, 3, 4, 5, 24, 21, 6, 7, 22, 20.
to

sierrafery · Dec 11, 2015

Yes, all those bits can be removed, fit the blanking plate where you pointed with red and clog the 2 vacuum ports to not be a leak at 8 just be carefull to not restrict the flow between 9 and 19, that pipe with red seems like coolant return from oil cooler so leave it there, also you have to join together the two thin coolant pipes which are going into the EGR cooler/heat exchanger(15)

bankz5152 · Dec 11, 2015

What are parts 23 and 24? One of them has a rubber tube that feeds round to the airbox? I just don't like unnecessary junk in my engine bay!

I did look last night that pipe I highlighted is redundant after blanking the EGR off, it runs round the back of the engine into the oil cooler. No other pipes attached to it. So I was going to remove that and blank off like so -

sierrafery · Dec 11, 2015

1. 23, 24 are the EGR vacuum controll solenoids
2. maybe there was a leak through the oil cooler's internals and the previous owner blanked the coolant circuit instead of fixing the cooler cos it's friggin expensive, that pipe is for lower coolant circuit to the tank's return so IMO it's not a good ideea to blank it(check the coolant low diagram in RAVE) :
"Oil cooler
...
Full water pump flow is directed along the cooler housing which also distributes the flow evenly along the block into
three core holes for cylinder cooling. This cools the engine oil before it is passed into the engine. A small percentage
of the coolant from the oil cooler passes into a metal pipe behind the engine. It then flows into the lower radiator via
a hose.
...
Coolant from the cylinder block flows through the oil cooler to the EGR cooler and then back to the
expansion tank. and via a pipe and hose enters the lower radiator. The lower temperature coolant from the oil cooler
housing is subjected to an additional two passes through the lower radiator to further reduce the coolant temperature.
From the lower radiator the coolant flows , via a hose, to the fuel cooler.
As the hot fuel cools, travelling slowly forwards through the cooler, it meets the progressively colder coolant travelling
in the opposite direction from the lower radiator."

bankz5152 · Dec 11, 2015

So 23 & 24 can be removed providing all the pipe work is correctly blanked etc? What about the wiring thats hanging around there?

Heres the link to where I saw that -
http://goingbush.com/defender.html

I'm pretty sure that pipe isnt plugged into anything except for one end at the oil cooler.

sierrafery · Dec 11, 2015

isolate the electric plugs of the solenoids to not touch eart, that's all, you have igniton live on them if you want to trigger a relay for aux lights or something

bankz5152 · Dec 11, 2015

For clarity I found I a diagram, its part 6. Connects to pipe 37 which connects to the EGR part 34.

sierrafery · Dec 11, 2015

I know that's why i told you to see the coolant flow, but watch the coolant flow for the Eu2 type without EGR cooler too which has the pipe going to low port of the radiator cos it has it's purpose as described in those coloured parts i posted... IMO if it wasn't necessary the Eu2 version wouldn't have had it at all... as it's about a small percentage it might not affect much but i dont like to mess with the cooling system myself

bankz5152 · Dec 11, 2015

Forgive me as I may well be being thick here but what possible effect on cooling could it have if its only plugged in at one end and blanked off at the other end?

sierrafery · Dec 11, 2015

I remember that the small pipe which connects from the oil cooler to the metal pipe(the one you blanked) broke on mine once(Eu2 type) and saw steam then when i lifted the bonnet it was quite of pressure there so IMO it has a serious effect in the coolant flow through the oil cooler, clogging it might reduce the flow rate through the oil cooler and the oil temperature could be higher than it was designed to...and there's no sensor for that to warn you

bankz5152 · Dec 11, 2015

Thanks for the patience and taking the time to explain! I'm having another look and that pipe that I showed above is blanked off at one end and there is a tube on my rad which would accept this exact pipe but its not connected?

sierrafery · Dec 11, 2015

the port on the rad is not connected because it's for the Eu2 type, as i said if you watch the coolant flow for Eu2 you'll see the setup, i dont think they would have bothered with it if it wasnt necessary, IMO without that pipe there's actually amost no coolant flow through the oil cooler cos the cooler acts like a kinda coolant plug on the side of the engine

TD5 Defender - EGR Question

bankz5152

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sierrafery

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bankz5152

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sierrafery

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bankz5152

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sierrafery

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bankz5152

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