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>Hi all, My father is a member if the Club, but >unfortunatley not into computers so I am posting up >here for him. > >We have a problem with our Seamaster 27 and >overheating. > >A little background ot the engine first. > >Its a 1500 BMC Newage Diesel that has had the >injectors & rail replaced about 6 years ago but other >than that just been regularly maintained. It's a keel >cooler though, not raw water cooled. > >We had a burst hot water cylinder about 3 years ago >(about 2 1/2' long) and we replaced it with a 1m long >stainless steel tank. It holds the same domestic water >volume but is shorter & fatter that the one we took >out. The old tank had a 25mm copper pipe in & out of >both ends that enlarged to 2" inside the tank. When we >realised this (cut the old tank up to dispose of it) >we increased the coolong water quantity to compensate >(by adding lengths of Stainless Steel tube). > >Ever since we replaced the water tank the engine >temprature has been very "sensitive". it will cruise >at just below the speed limit on the Thames at 90^C >water temp but as soon as you give it some more >throttle the temp just rises & rises - a short blast >(5 -7 mins) today saw the temp reach nearly 100^C !! > >Has anyone any suggestions or things to try to find >out why it is bad? It never used to be like this!

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