I had an 83 WB that did this when the gasket let go between the cylinder and the cooling system. It never leaked, but would blow the coolant out when the gas from the cylinders would blow-by. I drove it from NM to MO by slowing down to 55-60 MPH from the 70 I had been driving, and bled the cooling system in the mornings before I started that day's drive. Once or twice I had to bleed it during the day. By watching your temperature gauge closely, you can see when it's about to blow. The needle will start to rise very quickly and with the practice I got, I learned to catch it. There was some minor damage to the head that had to be lightly machined to correct. Otherwise, it was the normal waterboxer gasket replacement. |
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