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[Markie]

There is a good chance the water pump rubber seal will fail as well....

Its kind of on my plan B to do list  :-/

[tunnie]

Markiec, good tip i have been told for afterwards is some bleach in the header tank to go around with the coolant.

Obviously don't run it for long, and flush it very well afterwards. But the bleach breaks the oil up and with a few flushes of pure water comes out a treat.

[Marks DTM Calib]

I wouldn't use bleach....alkaline products have a habit of attacking alloy, use a proper de-greaser.

If it was me, I would have the timing cover off so I could get the water pump out, then you can fill the valley section up with de-greaser mix and leave it for a while....pull the water pump and it drains the block again ready for flushing.....

Putting a hose pipe into the coolant pipe that runs arond 1/3/5 head with no pump fitted is a very effective way of flushing the block section....

[Markie]

I wouldn't use bleach....alkaline products have a habit of attacking alloy, use a proper de-greaser.

If it was me, I would have the timing cover off so I could get the water pump out, then you can fill the valley section up with de-greaser mix and leave it for a while....pull the water pump and it drains the block again ready for flushing.....

Putting a hose pipe into the coolant pipe that runs arond 1/3/5 head with no pump fitted is a very effective way of flushing the block section....

Top tip Mark  

Thanks