Diesel losing water........

lady zed · 25th June 2018, 22:06

Having to top up around 300ml every 10 miles or so...….any ideas? No other symptoms other than heating up VERY quickly but NOT overheating. Car has done over 200k miles and is a great runner.

Arctic · 26th June 2018, 01:05

Hi Anna
Check the Y shape connector to the head they can leak there as the unit goes brittle and or the gasket leaks slowly, also look and the thermostat area to see if it is leaking there, check the O-rings on the cap, how much coolant do you have in the header tank topped just to the max line yes.

steveharvey2001 · 26th June 2018, 16:26

This happened to my CDT Tourer at a similar mileage - twice

The first time it was the thermostat, the second time it was an O-ring

Details on this thread....

genpk · 27th June 2018, 20:36

Only issues ive had with my diesel re water was the o ring on the pipe that goes into the thermostat rotted and an oil cooler which put oil in the coolant.
Id also have a look around the oil cooler as there is a rubber gasket which seals
the cooler to the block which can get distorted if the aluminium cooler corrodes.

DMGRS · 28th June 2018, 01:40

Check the pulley on the waterpump is running true - and isn't leaning to one side.
That's how my last pump failed - the bearing failed, causing the pulley to lean to one side, and destroy the seal.

Mike Noc · 28th June 2018, 08:27

All the common leak points have already been covered so far in this thread, so just a case of getting the torch and tools out and checking each one.

Good luck with the finding it.

lady zed · 30th June 2018, 08:41

Thanks everyone......going to get Cossie Dunc to have a look

75c · 30th June 2018, 15:02

When it happened to my derv it was the expansion cap.

25th June 2018, 22:06	#1
lady zed This is my second home Rover 75 Saloon Join Date: Nov 2006 Location: On the edge Posts: 6,659 Thanks: 1,354 Thanked 1,210 Times in 716 Posts	Diesel losing water........ Having to top up around 300ml every 10 miles or so...….any ideas? No other symptoms other than heating up VERY quickly but NOT overheating. Car has done over 200k miles and is a great runner. __________________ it's all about the first person you want to tell good news to

26th June 2018, 16:26	#3
steveharvey2001 Loves to post Mini Cooper SE Join Date: Mar 2008 Location: Worcester Posts: 369 Thanks: 39 Thanked 40 Times in 32 Posts	This happened to my CDT Tourer at a similar mileage - twice The first time it was the thermostat, the second time it was an O-ring Details on this thread.... __________________ "How can one little insulated wire bring so much happiness?!" Homer J Simpson

28th June 2018, 01:40	#5
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	Check the pulley on the waterpump is running true - and isn't leaning to one side. That's how my last pump failed - the bearing failed, causing the pulley to lean to one side, and destroy the seal. __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

30th June 2018, 08:41	#7
lady zed This is my second home Rover 75 Saloon Join Date: Nov 2006 Location: On the edge Posts: 6,659 Thanks: 1,354 Thanked 1,210 Times in 716 Posts	Thanks everyone......going to get Cossie Dunc to have a look __________________ it's all about the first person you want to tell good news to

27th June 2018, 20:36	#4
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,664 Thanks: 3 Thanked 461 Times in 299 Posts	Only issues ive had with my diesel re water was the o ring on the pipe that goes into the thermostat rotted and an oil cooler which put oil in the coolant. Id also have a look around the oil cooler as there is a rubber gasket which seals the cooler to the block which can get distorted if the aluminium cooler corrodes.

28th June 2018, 08:27	#6
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,552 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	All the common leak points have already been covered so far in this thread, so just a case of getting the torch and tools out and checking each one. Good luck with the finding it.

30th June 2018, 15:02	#8
75c Gets stuck in Rover 75 Saloon Join Date: Feb 2018 Location: Belfast Posts: 601 Thanks: 150 Thanked 294 Times in 190 Posts	When it happened to my derv it was the expansion cap.