KV6 190 persistent overheating

mgb66 · 2nd August 2021, 11:08

Arctic, many thanks for this. The O-rings were certainly flattened and I've replaced them with R-18s from my spares. Trust that's the right size.
Presumably this could partly explain some loss of coolant.
Regarding the re-fill procedure the Haynes procedure suggests removing the expansion tank bleed hose from the top of radiator.
In other descriptions of the procedure this is not included. Is this important?
I can see though that being at the top of the system it is a place for trapped air to escape from.

However once the expansion tank is raised up it is one of the first places for coolant to escape whilst refilling.
Also regarding coolant level the Haynes procedure specifies filling the tank to just below the filler neck. However as soon as the engine is started as per the procedure coolant overflows.
Is this anyone else's experience?
Oh, what fun this all is. I'm so looking forward to possibly having to change the thermostat.

2nd August 2021, 11:08	#8
mgb66 Regular poster MG-ZTT Join Date: Aug 2018 Location: London Posts: 41 Thanks: 5 Thanked 7 Times in 4 Posts	Arctic, many thanks for this. The O-rings were certainly flattened and I've replaced them with R-18s from my spares. Trust that's the right size. Presumably this could partly explain some loss of coolant. Regarding the re-fill procedure the Haynes procedure suggests removing the expansion tank bleed hose from the top of radiator. In other descriptions of the procedure this is not included. Is this important? I can see though that being at the top of the system it is a place for trapped air to escape from. However once the expansion tank is raised up it is one of the first places for coolant to escape whilst refilling. Also regarding coolant level the Haynes procedure specifies filling the tank to just below the filler neck. However as soon as the engine is started as per the procedure coolant overflows. Is this anyone else's experience? Oh, what fun this all is. I'm so looking forward to possibly having to change the thermostat.