Diesel return cooler bypass

maxi_crawf · 27th January 2019, 12:38

So as above,
Can I temporarily bypass the diesel cooler so I can use the car until I get a replacement to refit, the original on the car is leaking and I'm not going to add any skid patches on the road, if so what do I connect to what?

Rick-sta · 27th January 2019, 15:39

Yes you can bypass the diesel fuel cooler.

Where you need to bypass it depends on where the leak is, is it the cooler itself leaking? If so you can just remove the inlet and outlet and connect those pipes together to bypass it.

Attached is a diagram for the fuel cooler which may help.

trikey · 27th January 2019, 18:18

I bet its the little valve in the centre of the cooler that's leaking Roy...

Mike Noc · 27th January 2019, 20:48

Quote:

Originally Posted by maxi_crawf

So as above,
Can I temporarily bypass the diesel cooler so I can use the car until I get a replacement to refit, the original on the car is leaking and I'm not going to add any skid patches on the road, if so what do I connect to what?

Bit of info here on how everything is plumbed in including the colour codes on the pipes:

maxi_crawf · 28th January 2019, 07:00

Quote:

Originally Posted by trikey

I bet its the little valve in the centre of the cooler that's leaking Roy...

Is it the black plastic thingummy with a few pipes going in and out?
I think it is to be honest, the actual "radiator" looks ok, aluminium?

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paulf · 29th January 2019, 20:51

On my old car that part sprung a leak 4 or 5 years ago and i temporarily removed the whole unit and never got around to replacing, it with no obvious consequences.I heard tales of the tank melting due to the fuel return being too hot but really couldnt believe that, the only reason i can think for having it is to regulate the fuel temperature and therefore density for more acccurate regulation.
I did have to replace the small plastic 4 way joiner as it is necessary to control the fuel return flow rate, without it i got a low fuel pressure fault and cut out above 2000 rpm.
Paul.

Quote:

Originally Posted by maxi_crawf

Is it the black plastic thingummy with a few pipes going in and out?
I think it is to be honest, the actual "radiator" looks ok, aluminium?

Sent from my SM-G925F using Tapatalk

stamfordzs · 30th January 2019, 11:34

Are these an easy swap? Just bought a ZT-T with a seeping cooler. Bought a replacement cooler. Hopefully the connectors are self closing on separation so no leaking?

maxi_crawf · 3rd February 2019, 14:00

Well yesterday I decided to fit the replacement diesel cooler and as suggested by Trikey replace the entire thing instead of just the leaking bit, however (and there is alway a however lol) the bit I salvaged from a scrapper had two pipes with make/brake connectors (finger thickness) and one breather pipe (pencil thickness) when I tried take off the one on my 75 it turns out it has three thick lines and one breather, all I can think is that my 75 has the Webasto heater and the donor car did not so needed the extra pipe

I managed to take off just the leaking bit and swap it for the replacement part, the important bit is that I now have a cooler setup that is not leaking diesel all over

To answer the previous poster, the lines are push fit with a tab you squeeze to undo but NOT self sealing so expect some diesel spillage when you do it.

stamfordzs · 3rd February 2019, 21:09

Quote:

Originally Posted by maxi_crawf

Well yesterday I decided to fit the replacement diesel cooler and as suggested by Trikey replace the entire thing instead of just the leaking bit, however (and there is alway a however lol) the bit I salvaged from a scrapper had two pipes with make/brake connectors (finger thickness) and one breather pipe (pencil thickness) when I tried take off the one on my 75 it turns out it has three thick lines and one breather, all I can think is that my 75 has the Webasto heater and the donor car did not so needed the extra pipe

I managed to take off just the leaking bit and swap it for the replacement part, the important bit is that I now have a cooler setup that is not leaking diesel all over

To answer the previous poster, the lines are push fit with a tab you squeeze to undo but NOT self sealing so expect some diesel spillage when you do it.

Superb, thanks.

maxi_crawf · 3rd February 2019, 14:01

Quote:

Originally Posted by stamfordzs

Are these an easy swap? Just bought a ZT-T with a seeping cooler. Bought a replacement cooler. Hopefully the connectors are self closing on separation so no leaking?

It's two bolts and the connections, see my following post

27th January 2019, 12:38	#1
maxi_crawf Posted a thing or two R75 Saloon Conn CDT SE, MG ZT190+ Join Date: Nov 2006 Location: Kingston-upon-Hull Posts: 1,960 Thanks: 823 Thanked 426 Times in 274 Posts	Diesel return cooler bypass So as above, Can I temporarily bypass the diesel cooler so I can use the car until I get a replacement to refit, the original on the car is leaking and I'm not going to add any skid patches on the road, if so what do I connect to what?

27th January 2019, 18:18	#3
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,773 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	I bet its the little valve in the centre of the cooler that's leaking Roy... __________________ Lest we forget..

30th January 2019, 11:34	#7
stamfordzs Newbie MG ZT-T, MG ZS 200 Join Date: Jan 2019 Location: Waterlooville Posts: 15 Thanks: 1 Thanked 8 Times in 2 Posts	Are these an easy swap? Just bought a ZT-T with a seeping cooler. Bought a replacement cooler. Hopefully the connectors are self closing on separation so no leaking?

3rd February 2019, 14:00	#8
maxi_crawf Posted a thing or two R75 Saloon Conn CDT SE, MG ZT190+ Join Date: Nov 2006 Location: Kingston-upon-Hull Posts: 1,960 Thanks: 823 Thanked 426 Times in 274 Posts	Well yesterday I decided to fit the replacement diesel cooler and as suggested by Trikey replace the entire thing instead of just the leaking bit, however (and there is alway a however lol) the bit I salvaged from a scrapper had two pipes with make/brake connectors (finger thickness) and one breather pipe (pencil thickness) when I tried take off the one on my 75 it turns out it has three thick lines and one breather, all I can think is that my 75 has the Webasto heater and the donor car did not so needed the extra pipe I managed to take off just the leaking bit and swap it for the replacement part, the important bit is that I now have a cooler setup that is not leaking diesel all over To answer the previous poster, the lines are push fit with a tab you squeeze to undo but NOT self sealing so expect some diesel spillage when you do it.