I've got a similar problem. Determined that it is caused by cracks in the firewall around the clutch cylinder. See the link below.
http://www.oilburners.net/threads/clutch-problems-due-to-cracked-firewall-heres-what-to-do-part1.44519/
86 F250 4x4 6.9L with Banks turbo, 91K miles, 4 speed. My first diesel so I'm still learning. Five wet injectors, two of them leaking very badly. I haven't taken them out yet and could not find answers to my questions in a forum or google search. I figure that o-rings need replaced and it looks...
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