Thread: TD5 Head

The oil cooler was blanked off by LR for MY04 td5 fact!
See diagram post 27
collant diagram for 04 td5 manual disco - Page 2

Disco 2 TD5 Oil Cooler Coolant Plug PYB500040 - Land Rover Zone

http://www.aulro.com/afvb/discovery-...5-mystery.html

Originally Posted by northiam

The oil cooler was blanked off by LR for MY04 td5 fact!
See diagram post 27
collant diagram for 04 td5 manual disco - Page 2

Disco 2 TD5 Oil Cooler Coolant Plug PYB500040 - Land Rover Zone

http://www.aulro.com/afvb/discovery-...5-mystery.html

Yes I know, I used to have it blanked at the cooler, prior to the new head.
I know there is genuine part/bung supplied by LR to blank it.
some will blank it off, others will leave it connected.

The diagram for that 04 td5... well about half that plumbing is different to mine (1999 TD5)
Interestingly, part 32 in that diagram, the steel pipe around the back of the head is still there & returns to the header as the regular D2a does (via EGR cooler from oil cooler), according to the pic the other end of the steel pipe hooks onto a weird T-piece, instead of the oil cooler
It's just a personal choice, & i chose to reconnect, it certainly wont hurt anything.

P.S
I was going to say i'd hate to be trying to order a set of hoses for that MY04 td5...
Then I read this from the last MY04 td5 post
"All done over the Weekend new water pump, new hoses, had to make a few out of silicon hose as couldnt get from Landrover as know one seen before"
Very strange!!

Part 32 in the said diagram is a rubber pipe off the expansion tank unique to the 04...
Theres nothing connected at the oil cooler.

Originally Posted by roverv8

Well, after looking at the EU2 flow chart the secret hose & pipe flowed into the old type radiator & back out to the fuel cooler, it's been well documented that the newer type radiator is different, one open chamber & the blank spigot shouldn't be drilled.
I have the new type radiator So i put a T-piece into the single hose from the radiator to fuel cooler & connected it there.
I moved the metal restictor from the fuel cooler & put it into the T-piece coming from the radiator to T-piece so it still serves it's purpose restricting radiator flow to the cooler.
Secret oil cooler hose still flows to the fuel cooler as it did with the old radiator.

So you have piped the oil cooler hot coolant connection (admitantly not as hot as the head outlet) to the fuel cooler feed pipe which relies on the cooled coolant from the rad to cool the fuel

The secret hose did originally flow to the fuel cooler only after it was cooled via the separate lower section of the eu2 rad

Originally Posted by northiam

Part 32 in the said diagram is a rubber pipe off the expansion tank unique to the 04...

Fair enough, it's a bit hard to follow as some items are penciled in

Theres nothing connected at the oil cooler.

Yes I can see that ,
I was talking about most D2a's (it's connected from oil cooler to th EGR cooler & back to the expansion tank)

Originally Posted by northiam

So you have piped the oil cooler hot coolant connection (admitantly not as hot as the head outlet) to the fuel cooler feed pipe which relies on the cooled coolant from the rad to cool the fuel

The secret hose did originally flow to the fuel cooler only after it was cooled via the separate lower section of the eu2 rad

For one, that coolant coming out of the secret hose has come straight from the water pump, the w'pump flows straight into the oil cooler from the block.
It also has much cooler coolant flow from the bottom of the Radiator mixing at the T-piece join.

Apart from all that , as Ive already stated,
your regular EU3 flow setup goes oil cooler - EGR cooler & back to the expansion tank, so it doesn't get near the radiator...

Ive monitored both coolant & fuel temps with Hawkeye, the fuel temps have stayed well, well below the coolant temps so im happy & not going to enter into a debate about it.

If one day I choose to blank off the oil cooler again, I can as ive drilled no holes in the radiator spigot, I can simply replace or join the radiator/fuel cooler hose.

I wish i'd pulled the tank off my old radiator to have a look inside, when i shoved the hose in the spigot it came out the top end instantly, i don't think the radiator done much cooling to this..
the spigots are on the same side

The coolant pump washes coolant thru the block core holes before and that oil cooler would add to the temp.

I imagine the EU3 EGR cooler coolant flow would be limited by the small return hose to the expansion tank?

The EU2 rad has a divider between the flow and return on that side to direct coolant across the rad core and back.

I recently blanked off my drilled rad and oil cooler outlet and made the difference of a 2degC at the ECT.
I conclude the coolant flow thru the oil cooler is only robbing flow thru the engine and radiator.

Come on Summer!

Originally Posted by northiam

The coolant pump washes coolant thru the block core holes before and that oil cooler would add to the temp.

Well, I just had my oil cooler & water pump removed together & done lots of flushing with the garden hose, with the head removed
the water pump bracket is sealed to the block by an oring, coolant goes from the pump through a large cavity directly into oil cooler, then forced through the 3 large block holes into the block...