V6 pressurising coolant massively - Page 2

Ps3000 · 14th October 2015, 12:16

Mine's in my garage at present waiting for me to get the time and inclination to complete the engine swap. Symptoms very similar to the OPs.

Without rehearsing the whole saga, I have run out of things to change so it has to be HGF or cracked head/liner. It all started when the rad went.

I bought one of those chemical tester kits (the ones that turn the chemical a different colour when exhaust gases are present in the coolant) but it didn't indicate a problem. However it's definitely not healthy. Just hope the spare engine I bought on trust is OK

Is a cracked liner a big job? - can it even be done? I am not familiar with wet liner engines.

trikey · 14th October 2015, 12:21

Quote:

Originally Posted by Ps3000

Mine's in my garage at present waiting for me to get the time and inclination to complete the engine swap. Symptoms very similar to the OPs.

Without rehearsing the whole saga, I have run out of things to change so it has to be HGF or cracked head/liner. It all started when the rad went.

I bought one of those chemical tester kits (the ones that turn the chemical a different colour when exhaust gases are present in the coolant) but it didn't indicate a problem. However it's definitely not healthy. Just hope the spare engine I bought on trust is OK

Is a cracked liner a big job? - can it even be done? I am not familiar with wet liner engines.

Liners can be swapped easily, plenty of info on the net if you want to see

Ps3000 · 14th October 2015, 12:27

Quote:

Originally Posted by trikey

Liners can be swapped easily, plenty of info on the net if you want to see

Thanks Trikey, my google skills obviously aren't up to much, as I'm not seeing it.

FrazzleTC · 14th October 2015, 12:42

Currently, the car is still on the road, and running fine, just using a lot of coolant, so it's just being run on old OAT from other cars that I've drained. It doesn't always pressurise either, which is really odd, so we're running it until it stops, before going for an engine swap.

Ps3000 · 14th October 2015, 12:52

Frazzle - mine was exactly the same (except I was using fresh OAT mix).

The coolant loss wasn't huge, and varied.

Occasionally there wasn't a big pressure release when I took the cap off, but mostly there was.

Temperatures were fine.

It finally packed up (had a major overheat) on the way to the National meet a couple of weeks ago (although it still hasn't failed catastrophically - once topped up it would run again, but couldn't keep the temp down to sensible level any more).

kaiser · 14th October 2015, 13:02

If you get pressure in the coolant system on a scale that forces water out (full cooling system, fan working and thermostat opening ), the engine needs to be repaired. Heads off minimum.

SD1too · 24th October 2015, 12:28

Quote:

Originally Posted by Jules

The more cases we can document of KV6 pressurising, the more we can understand the causes and cures ..

Hello Jules,

I reckon that you'll be interested to read what Trevor has found when investigating KV6 pressurisation and projectile ejection of coolant at low temperatures.

Edit: Here's another one for you Jules.

Simon

FrazzleTC · 8th May 2016, 16:43

Back to this again.

The car has had its coolant flushed several times, yet persistently uses a lot, there's some mayo on the oil cap, it's had several new expansion caps, new radiator, and a whole host of other bits in a seemingly helpless attempt to solve the issue.

Today, it boiled, sufficiently to put the red light on and move the gauge right round. It is now sitting around 100-105 degrees in traffic, and yes, the fan is a Revotec and working perfectly. Time to scrap this engine, I think?

Ravinder · 8th May 2016, 17:42

Why not examine the engine first and see if it's salvageable and rebuild it?

FrazzleTC · 8th May 2016, 19:06

I'm really not convinced that KV6s rebuild well. The only two people I know who spent a lot of money getting KV6 engines rebuild completely wasted their money.

14th October 2015, 12:42	#14
FrazzleTC This is my second home Rover 75 Tourer Join Date: Sep 2011 Location: Staffordshire Moorlands Posts: 7,924 Thanks: 533 Thanked 1,178 Times in 920 Posts	Currently, the car is still on the road, and running fine, just using a lot of coolant, so it's just being run on old OAT from other cars that I've drained. It doesn't always pressurise either, which is really odd, so we're running it until it stops, before going for an engine swap. __________________ 1967 Rover 2000 Automatic 1969 Rover 3500 Series One 1979 Scimitar GTE 2013 Mercedes SLK250 CDI

14th October 2015, 13:02	#16
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	If you get pressure in the coolant system on a scale that forces water out (full cooling system, fan working and thermostat opening ), the engine needs to be repaired. Heads off minimum. __________________ Worth his V8 in gold

8th May 2016, 16:43	#18
FrazzleTC This is my second home Rover 75 Tourer Join Date: Sep 2011 Location: Staffordshire Moorlands Posts: 7,924 Thanks: 533 Thanked 1,178 Times in 920 Posts	Back to this again. The car has had its coolant flushed several times, yet persistently uses a lot, there's some mayo on the oil cap, it's had several new expansion caps, new radiator, and a whole host of other bits in a seemingly helpless attempt to solve the issue. Today, it boiled, sufficiently to put the red light on and move the gauge right round. It is now sitting around 100-105 degrees in traffic, and yes, the fan is a Revotec and working perfectly. Time to scrap this engine, I think? __________________ 1967 Rover 2000 Automatic 1969 Rover 3500 Series One 1979 Scimitar GTE 2013 Mercedes SLK250 CDI

8th May 2016, 19:06	#20
FrazzleTC This is my second home Rover 75 Tourer Join Date: Sep 2011 Location: Staffordshire Moorlands Posts: 7,924 Thanks: 533 Thanked 1,178 Times in 920 Posts	I'm really not convinced that KV6s rebuild well. The only two people I know who spent a lot of money getting KV6 engines rebuild completely wasted their money. __________________ 1967 Rover 2000 Automatic 1969 Rover 3500 Series One 1979 Scimitar GTE 2013 Mercedes SLK250 CDI

14th October 2015, 12:16	#11
Ps3000 Gets stuck in None at moment Join Date: May 2013 Location: Loughborough Posts: 899 Thanks: 230 Thanked 125 Times in 113 Posts	Mine's in my garage at present waiting for me to get the time and inclination to complete the engine swap. Symptoms very similar to the OPs. Without rehearsing the whole saga, I have run out of things to change so it has to be HGF or cracked head/liner. It all started when the rad went. I bought one of those chemical tester kits (the ones that turn the chemical a different colour when exhaust gases are present in the coolant) but it didn't indicate a problem. However it's definitely not healthy. Just hope the spare engine I bought on trust is OK Is a cracked liner a big job? - can it even be done? I am not familiar with wet liner engines.

14th October 2015, 12:52	#15
Ps3000 Gets stuck in None at moment Join Date: May 2013 Location: Loughborough Posts: 899 Thanks: 230 Thanked 125 Times in 113 Posts	Frazzle - mine was exactly the same (except I was using fresh OAT mix). The coolant loss wasn't huge, and varied. Occasionally there wasn't a big pressure release when I took the cap off, but mostly there was. Temperatures were fine. It finally packed up (had a major overheat) on the way to the National meet a couple of weeks ago (although it still hasn't failed catastrophically - once topped up it would run again, but couldn't keep the temp down to sensible level any more).

8th May 2016, 17:42	#19
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	Why not examine the engine first and see if it's salvageable and rebuild it?