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Old 03-21-2021, 05:24 AM
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fbd73 fbd73 is offline
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Join Date: Oct 2016
Location: Australia
Posts: 159
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Hi All,
Here is the latest.

I took the cap off (slowly) and released the pressure. I let the car sit overnight without the cap on. I did not start the car at all.
The next morning I put the cap back on. The next day I went to take the cap off and it had built up pressure, without even having started the car.

Next step.
My mechanic went to tighten the head bolts down (just a theory that it might be the problem) and had to stop as he found tiny broken springs in the top of the cylinder heads. They are the valve stem seal springs disintergrating. I have had the car towed back to the shop who overhauled the motor and they are in the process of replacing the valve stem seals and then will investigate the system holding pressure. By the way, it isn't just a small amount of pressure it is holding. If I removed the cap quickly or not carefully, it would spray all out over the fender.