Construction and Road Equipment
Construction and Road Equipment repair questions? Ask a mechanic ASAP
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There are three things I have seen cause this. The first is a faulty radiator cap. Which you have already replaced. Second is a leaking head gasket or cracked cylinder liner. And Lastly is a cracked jacket water precooler. It sits on top of the intake ports. If it is cracked, it will also leak coolant down in one of the cylinders. To confirm you can remove the cooler and look for a white residue. If you see white residue, the jacket water cooler is cracked. If you do not, I would suspect the head gasket or a cracked cylinder liner.
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