I suspected the GPW has had a weaping cylinder head gasket, especially after finding a little water when I changed the oil recently, so looked into it today. I started by cleaning and gapping the plugs and points. The engine started ok, so I pulled it out of the garage. The radiator level was down again. This has been a common problem for a while, often blowing out of the overflow.
It took a litre to fill it up again. This time the start sounded more lumpy. I suspected the topped up coolant was leaking into the cylinder head now the water level was higher. After running a short while, it smoothed out.
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