Thread: TD5 Head

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Yes I can see the internal passage from the forward hole

To conclude:
Anyone that can explain in anyway why capping the oil cooler spigot in not a good idea? (EU3 rad or motor with no EGR cooler)

I have never seen a Td5 that clean!

Will.

This is just a theory. Looking at the picture it appears to me that the three holes behind the oil cooler are what would just be welch plugs if there was no cooler.

Now it looks to me like LR wanting an oil cooler just had a mating flange cast and left out the three welch plugs.

Now this being the case there is the main water jacket behind the three holes.

Although the cooler is sitting in the coolant could it be possible that this coolant could be trapped and not in the main coolant flow?

This could explain why an outlet hose was put in so as coolant does actually flow over the cooler.

Now I know some have disconnected the secret hose and blocked it and claimed no adverse reaction, but until someone can 100% prove my theory wrong,
and I would be more than happy for this to happen as I too would like to get rid of excess piping, I will be leaving mine connected.

Originally Posted by d2dave

This is just a theory. Looking at the picture it appears to me that the three holes behind the oil cooler are what would just be welch plugs if there was no cooler.

Now it looks to me like LR wanting an oil cooler just had a mating flange cast and left out the three welch plugs.

Now this being the case there is the main water jacket behind the three holes.

Although the cooler is sitting in the coolant could it be possible that this coolant could be trapped and not in the main coolant flow?

This could explain why an outlet hose was put in so as coolant does actually flow over the cooler.

Now I know some have disconnected the secret hose and blocked it and claimed no adverse reaction, but until someone can 100% prove my theory wrong,
and I would be more than happy for this to happen as I too would like to get rid of excess piping, I will be leaving mine connected.

The pump flow enters the forward hole then is pushed directly into the cooler then thru the welsh/core holes into the block see 1st pic

Originally Posted by northiam

The pump flow enters the forward hole then is pushed directly into the cooler then thru the welsh/core holes into the block see 1st pic

I am missing something here. The first pic shows mostly the rear of the engine. I can't see the core holes.

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The pump in connected to the hole forward of the three oil cooler holes and flange.

Coolant cannot enter the block cavity at this point and is passaged to the oil cooler enclosure. See the gray flow in pic.

Then if the engine oil cooler cover was attached coolant is forced thru the core holes into the block cavity.

Ok. So what I now understand I have put in the pic below.

Is what is in this pic correct?

I'd say it's that way for even coolant flow into the block, front & rear
Can you imagine if it had an inlet to the block at the pump inlet, the coolant would go straight in there & up to the head outlet, with less flow to the rear of the block & head.

This from RAVE, under TD5 cooling system description & operation
"coolant flow & engine hot"

A controlled flow of the lower temperature coolant is drawn by the pump and blended with hot coolant from the by-pass
and the heater return pipes in the pump feed pipe. The pump then passes this coolant, via the cylinder block, to
the oil cooler housing, cooling the engine oil before entering the block to cool the cylinders.


I'd conclude the coolant outlet on the oil cooler housing allows some extra minimal flow past the internal part of the oil cooler chamber & out of the engine.
The Question is why, for so long did LR think it was necessary to have this coolant outlet on the oil cooler, as The fuel cooler can be cooled from the radiator with the current EU3 setup.
Were they worried about the internal orings on the oil cooler not standing up to the pump pressure??
Who knows