The engine suddenly dumped all the coolant into the sump. I thought it might be the oil cooler, while taking the oil cooler off I noticed a build up of crystals from the antifreeze between the head and the block. I am going to try and clean out the oil cooler then blank off the water outlet put some water in the oil side and try to do a pressure test to see if the cooler is at fault if the water starts to be blown out then I will put a new oil cooler on and hope all is ok after a good flush through.
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