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Message: [QUOTE="sootie, post: 1552878, member: 8162"] The manufacturer of the valves had an issue with the heat treating process, which caused them to crumble and break apart prematurely. This would damage the cylinder and require the long block to be replaced in most cases. Contrary to what the internet mechanics say, the tip of the glow plug did not break off and destroy the valve, it was the inverse. The Ford diagnostic process starts with a relative compression test. Then, if there is a cylinder with low compression, remove the glowplug and check the tip to see if it has been chewed off. Its a quick way to see if anything foreign has been beating around the cylinder. [/QUOTE]

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