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Re the comments about head gaskets or cracked head, the water in my overflow was bubbling but there didn't seem to be bubbles in the radiator which started my investigations and findings with the water and airlock issues.I would suggest if you have a cracked head that will show up as water in oil or bubbles in the radiator but not necessarily in the D22 as the bubbles somehow like the water flow noticed in other cars just doesn't seem to happen visually anyway but if there is air in the water it will exit into the overflow.In my case besides the water/air problems I had an oil leak at the back of the motor so removed the head and found the head gasket had been damaged presumably at installation and suspect the air/water leak was from the same cause and I suspect the head gasket was reused??Head tested and reconditioned and filling slowly radiator was filled once only with no bubbles or oil leaks so hopefully all now ok but if not will just buy another wreck or a motor and replace.
Re the comments about head gaskets or cracked head, the water in my overflow was bubbling but there didn't seem to be bubbles in the radiator which started my investigations and findings with the water and airlock issues.
I would suggest if you have a cracked head that will show up as water in oil or bubbles in the radiator but not necessarily in the D22 as the bubbles somehow like the water flow noticed in other cars just doesn't seem to happen visually anyway but if there is air in the water it will exit into the overflow.
In my case besides the water/air problems I had an oil leak at the back of the motor so removed the head and found the head gasket had been damaged presumably at installation and suspect the air/water leak was from the same cause and I suspect the head gasket was reused??
Head tested and reconditioned and filling slowly radiator was filled once only with no bubbles or oil leaks so hopefully all now ok but if not will just buy another wreck or a motor and replace.
