KV6 losing coolant. Advice please.

GadgetBoy · 11th February 2010, 10:50

content removed at OPs request

David3807 · 11th February 2010, 11:03

Most likely I think is the thermostat housing and/or adjoining pipes.

Take off engine cover and check in 'V' between cylinders for red coolant staining.

HGF comes at the very bottom of the list for KV6 cooling problems. Can happen of course like on any engine but pretty rare on KV6.

kaiser · 11th February 2010, 12:49

It is liners that leak. And, yes, you can have, and most likely do have, a leaking thermostat housing.

See why you loose water:
http://www.the75andztclub.co.uk/foru...ght=thermostat

See whats up with your thermostat:
http://www.the75andztclub.co.uk/foru...ght=thermostat

Only now realize you say it is the radiator cap with mayo. That indicates oil in the water. To be sure of the liners it should be the oil filler cap, which would be water in the oil.

Anyhow, enjoy reading. The stuff is certainly worth knowing, if you want to keep the car.

T-Cut · 12th February 2010, 10:12

Quote:

Originally Posted by GadgetBoy

content removed at OPs request

Sounds very odd. Here's the Rimmer diagrams for all the bits. You should be able to fathom it from these:

Pipework V6: http://www.rimmerbros.co.uk/Item--i-GRID001584

Expansion Tank V6: http://www.rimmerbros.co.uk/Item--i-GRID001598

TC

kaiser · 12th February 2010, 10:30

Quote:

Originally Posted by GadgetBoy

content removed at OPs request
.

A couple of long shots.
1. HGF
2. Elevated oil level
3. Auto trans water/oil heat exchanger
4. Bearing in water pump (this is a really looooong shot!!)
5. Crack in block
6. Failed inlet manifold gasket

I am sure there are another couple of possibilities, but darn if I can think of them at the moment.

I would check the water pump for a leak as well. You would be able to pick up stains behind the left front wheel at the bottom of the plastic cambelt cover.

You can have a fault where the pump leaks only while standing still, or one which only leaks while driving! I have had both. So to say these pumps are strong would be to really really be an optimist!

kaiser · 13th February 2010, 12:21

You realize that a leaking thermostat will not explain why you have oil in the water.
But, apart from that, try this for size:
http://forums.mg-rover.org/showthrea...tal+thermostat

hans.schaaper · 13th February 2010, 18:48

Haynes:
Inlet manifold to head: 25Nm = 18 lbf ft
Inlet manifold upper section bolts: 18Nm = 13 lbf ft

New gasket, new seals, new O-rings required.

Not an expert but 25Nm is NOT finger tight and there is coolant flowing through the manifold so you might be on to something.

jn12 · 12th March 2011, 16:49

Question: Given the KV6 is known for airlocks is it likely the extra coolant was needed due to airlocks/settling and would you learn-ed people expect it to settle down now?[/QUOTE]

Yes, i have had to top up a couple of times since last doing my last stat, no more then a litre. Also done this on other cars where i have replaced coolant. Did you follow the haynes guide for refilling coolant etc?

John

Zeb · 23rd March 2011, 19:47

Quote:

Originally Posted by GadgetBoy

content removed at OPs request

It may well be from here....and being evaporated by the exhaust headers hence no drips...

http://www.the75andztclub.co.uk/foru...ad.php?t=81072

trikey · 23rd March 2011, 19:49

Try the water pump, remove the engine undertray, leave to stand overnight, check next morning and if you have coolant running down to the sump then get the water pump checked.

11th February 2010, 10:50	#1
GadgetBoy Retired M Join Date: Aug 2009 Location: UK Posts: 38 Thanks: 0 Thanked 0 Times in 0 Posts	KV6 losing coolant. Advice please. content removed at OPs request Last edited by Dragrad; 7th May 2012 at 23:49..

11th February 2010, 11:03	#2
David3807 Posted a thing or two 2002 R75 Conn SE 2.5l Auto Tourer, 2001 R75 Conn SE 2.5 Auto Saloon Join Date: Nov 2006 Location: Gravesend Posts: 1,897 Thanks: 0 Thanked 2 Times in 2 Posts	Most likely I think is the thermostat housing and/or adjoining pipes. Take off engine cover and check in 'V' between cylinders for red coolant staining. HGF comes at the very bottom of the list for KV6 cooling problems. Can happen of course like on any engine but pretty rare on KV6. Last edited by David3807; 11th February 2010 at 11:06..

11th February 2010, 12:49	#3
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	It is liners that leak. And, yes, you can have, and most likely do have, a leaking thermostat housing. See why you loose water: http://www.the75andztclub.co.uk/foru...ght=thermostat See whats up with your thermostat: http://www.the75andztclub.co.uk/foru...ght=thermostat Only now realize you say it is the radiator cap with mayo. That indicates oil in the water. To be sure of the liners it should be the oil filler cap, which would be water in the oil. Anyhow, enjoy reading. The stuff is certainly worth knowing, if you want to keep the car. Last edited by kaiser; 11th February 2010 at 12:53..

23rd March 2011, 19:49	#10
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,777 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Try the water pump, remove the engine undertray, leave to stand overnight, check next morning and if you have coolant running down to the sump then get the water pump checked. __________________ Lest we forget..

13th February 2010, 12:21	#6
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	You realize that a leaking thermostat will not explain why you have oil in the water. But, apart from that, try this for size: http://forums.mg-rover.org/showthrea...tal+thermostat

13th February 2010, 18:48	#7
hans.schaaper Avid contributor rover 75 2.5 V6 auto Join Date: Feb 2008 Location: Alkmaar Posts: 197 Thanks: 0 Thanked 3 Times in 3 Posts	Haynes: Inlet manifold to head: 25Nm = 18 lbf ft Inlet manifold upper section bolts: 18Nm = 13 lbf ft New gasket, new seals, new O-rings required. Not an expert but 25Nm is NOT finger tight and there is coolant flowing through the manifold so you might be on to something.

12th March 2011, 16:49	#8
jn12 Gets stuck in MG ZT SE 180 V6 Sports Auto Join Date: Dec 2006 Location: Newcastle upon Tyne Posts: 938 Thanks: 74 Thanked 37 Times in 36 Posts	Question: Given the KV6 is known for airlocks is it likely the extra coolant was needed due to airlocks/settling and would you learn-ed people expect it to settle down now?[/QUOTE] Yes, i have had to top up a couple of times since last doing my last stat, no more then a litre. Also done this on other cars where i have replaced coolant. Did you follow the haynes guide for refilling coolant etc? John