The 75 and ZT Owners Club Forums - View Single Post - KV6

Sebastienclement · 23rd September 2018, 22:40

Hi all.

I have a 2.0Kv6 which a family member has been running for the past 2 years... It has needed a fair amount of TLC in the cooling department, and has now had the following completed:

Waterpump
Thermostat Assembly
Header tank cap
Radiator (old one found to be leaking)

A couple of months ago it developed a slight lumpiness on a cold start, and around the same time re-developed it's appetite for coolant. Previous to the above work being done, it did overheat on 3 occasions (OBD showing temps of 115'c / 118'c), the final time it threw most of it's coolant out through the header tank. The final time it was recovered where the garage found a leaky radiator, that was "pulling air into the cooling system and over-pressurising it".

I now have the car in my care to try and get to the bottom of the problems. At present the symptoms are:

It's not running on all 6 cylinders from a cold start. This clears in a maximum of 4 seconds to smooth running.
The car is losing coolant, however it seems to be losing coolant when the car is left to stand. It has covered 200 miles today, and the coolant was checked 3 times during the trip - no loss.
There is emulsified oil present under the oil filler cap. Not a lot, but enough to be a worry.
The car is not presently overheating, and the cooling fans are in working order.
There does not seem to be excess pressure in the cooling system, however I will check properly in the morning.
Plenty of toasty air from the cabin heater

The garage in question have supposedly had the oil cooler off to test it and is OK (not sure I trust them though!) and their 'diagnosis' is a "cracked engine block". They claim to have done a sniff test & emissions test which all were fine.

Any ideas?!

23rd September 2018, 22:40	#1
Sebastienclement Posted a thing or two Rover 75 Connoisseur SE Join Date: Nov 2012 Location: London Posts: 1,237 Thanks: 136 Thanked 160 Times in 85 Posts	KV6 - Oil emulsification / coolant loss. Hi all. I have a 2.0Kv6 which a family member has been running for the past 2 years... It has needed a fair amount of TLC in the cooling department, and has now had the following completed: Waterpump Thermostat Assembly Header tank cap Radiator (old one found to be leaking) A couple of months ago it developed a slight lumpiness on a cold start, and around the same time re-developed it's appetite for coolant. Previous to the above work being done, it did overheat on 3 occasions (OBD showing temps of 115'c / 118'c), the final time it threw most of it's coolant out through the header tank. The final time it was recovered where the garage found a leaky radiator, that was "pulling air into the cooling system and over-pressurising it". I now have the car in my care to try and get to the bottom of the problems. At present the symptoms are: It's not running on all 6 cylinders from a cold start. This clears in a maximum of 4 seconds to smooth running. The car is losing coolant, however it seems to be losing coolant when the car is left to stand. It has covered 200 miles today, and the coolant was checked 3 times during the trip - no loss. There is emulsified oil present under the oil filler cap. Not a lot, but enough to be a worry. The car is not presently overheating, and the cooling fans are in working order. There does not seem to be excess pressure in the cooling system, however I will check properly in the morning. Plenty of toasty air from the cabin heater The garage in question have supposedly had the oil cooler off to test it and is OK (not sure I trust them though!) and their 'diagnosis' is a "cracked engine block". They claim to have done a sniff test & emissions test which all were fine. Any ideas?!