Richard and Lynn thanks for the info and I replaced the head gasket as there was a problem with "water" ingestion due to no4 spark plug being very loose when I first got the truck, on stripping the head off I found two gaskets fitted but I have replaced them with a copper gasket and there is no water in the oil or blowing out the exhaust so all seems good. When I replaced the water pump and belt I didn't realise where the adjustment was so even though it was a tight fit I got the belt on, I will replace the belt with your spec's Richard and have an auto spares place I use that employs people over 21. The coolant blows out on reaching running temp so I believe the problem to be a combination of all the things you guy's have mentioned so as I have said spring, filler funnel and threaded lock ring will be replaced with new and I will search out a replacement belt.
Regards and will keep you all posted
Paul
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