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Thread: Missing Intake Valve Retaining nut

  1. #1

    Exclamation Missing Intake Valve Retaining nut

    The number 6 Intake valve is missing its retaining nut. My concern is where could it have gone? Could it fall into the oil pan and be sucked up? Could it be poised to jam a valve, score the cam, or something else? Should I pull the engine and find it or can I safely replace it comfortable that the nut is floating harmlessly somewhere without endangering anything? I think I know why it is missing. I recently adjusted the valves and the engine did not run well afterwards. I am re-adjusting the valves when I discovered the missing nut. My guess is that I did not tighten it properly and it backed off. Certainly accounts for the poor running since number 6 was not opening at all!
    Rich
    1970 911S Targa

  2. #2
    Senior Member
    Join Date
    Oct 2002
    Location
    Suffolk, VA
    Posts
    381
    That could be a real mess. At least it is the intake side... if it were the exhaust side, the nut might have gone down one of the oil return tubes. I forget how large the oil return orifices are inside the intake valve cover. Good Luck.
    1970 911S Coupe (Burgundrot) (sold)
    1967 911 Coupe (Light Ivory) (mostly gone)
    1966 911 Coupe (Sand Beige) (sold)
    Van Diemen RF99 Formula Continental
    Citation F1000 on the way
    Van Diemen Hayabusa SCCA Formula S (sale pending)
    Other Early 911/912/914

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