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Old 16-03-21, 05:18 PM
Thor Thor is offline
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Join Date: Jul 2008
Location: Meriden near Coventry
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That sounds exactly as though the pressure relief valve is stuck closed. I am sorry that I know nothing about Bristol 6-cylinder engines, but relief valves are often cylindrical plungers in a close-fitting bore, so it doesn't take much in the way of a spec of crusty soot or something, to jam the cylinder in the bore.
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