over heating diesel

[johns]

on my dads 6 cyilinder mercedes diesel the stacks in the heat excanger were removed due to leaking and everything was by passed and just runing on sea water it all went fine until he got the stacks repaired when it was refitted the engine started to overheat and the oil pressure was dissapearing there is plenty of water coming through the exaust does anyone have any advice

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[HenryB]

I had a similar overheating problem with my 4 cylinder Mercedes (OM 636) which eventually turned out to be an air lock in the engine (fresh) water pump. On mine there is a small pipe which leads from the water pump body to the cylinder block which is designed to stop air locks forming in the water pump. This had become blocked. All I had to do was to uncouple the flexible hose and clear the pipe that leads to the block. The pipe is very small diameter (about 1/4 inch) and very short so can take some finding. I stripped down the cooling system twice before I discovered it.
Hope this helps,
Henry

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