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Thread: Camshaft Nut Removal (left side)

  1. #1

    Camshaft Nut Removal (left side)

    On a 65/66 Solex carb'd motor, I have read in my research that the left side camshaft nut is different that the post Solex motors. Is this true, and is the 46mm p203 crowfoot wrench the proper tool to remove that left side camshaft nut? I have the crowfoot wrench and it doesn't seem to fit that nut very well, especially considering the torque involved.

    Thanks in advance for any help, pointers, and/or advice you may have for removing this cam nut.

    Josh

  2. #2
    Josh, I Recently had the same experience and found that I had to modify the tool to get it to fit. I can loan it to you if you send it back
    John Schiavone

    Connecticut

    356 Cab, 66 911, 914-6, 550-Beck, 981 Cayman, 54 MV Agusta Dustbid

  3. #3
    Quote Originally Posted by Alaskan911 View Post
    On a 65/66 Solex carb'd motor, I have read in my research that the left side camshaft nut is different that the post Solex motors. Is this true, and is the 46mm p203 crowfoot wrench the proper tool to remove that left side camshaft nut?
    I have the crowfoot wrench and it doesn't seem to fit that nut very well, especially considering the torque involved.
    Josh, the rear face of the early LH cam nut operates the mechanical fuel pumps, so it's only different in that respect.
    I don't recall that the difference has any affect on the nut's removal.

    The factory P203 crowfoot was designed for Solex engines. What most people use is a reproduction of the factory tool, which is shaped differently.
    As John said, it can be modified for additional clearance if necessary.

    Jon B.
    Vista, CA

  4. #4
    Fellas, I appreciate the info and the offer of the use of your tool John S. I have a Porsche mechanic friend coming over on Friday to help me out so hopefully he may have the modified or original tool, but if I do need a loaner I very much appreciate it and will let you know.

    Josh

  5. #5
    Here's a photo of the tool modified to clear the chain and sit flush with pulley
    Attached Images Attached Images  
    John Schiavone

    Connecticut

    356 Cab, 66 911, 914-6, 550-Beck, 981 Cayman, 54 MV Agusta Dustbid

  6. #6
    Thanks John....I may have to do some modifying of mine and see if I cam duplicate that. I appreciate the picture, that really helps.

    Josh
    Last edited by Alaskan911; 03-18-2020 at 09:03 PM.

  7. #7
    Quote Originally Posted by John912 View Post
    Here's a photo of the tool modified to clear the chain and sit flush with pulley
    John, quick question for you. How did you modify your tool this way? Just go to town with a grinder? I am going to try and do the same with my p203 tool, just trying to figure out what is gonna be easiest.

    thanks!!

    Josh

  8. #8
    Yes, it was a grinder. I paid a friend who’s out of work to do it
    John Schiavone

    Connecticut

    356 Cab, 66 911, 914-6, 550-Beck, 981 Cayman, 54 MV Agusta Dustbid

  9. #9
    Early 911S Registry # 237 NeunElf's Avatar
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    Funny, I just had a conversation about this very topic via Early 911S Registry private messaging.

    It just so happens that the 46 mm camshaft nut is the same size as the rear axle nut on a late split-windshield VW microbus (the desirable "big nut" transmission). To service my microbus I acquired a Williams tubular handle 46mm box wrench.


    One of these days I need to get a proper handle but it worked quite well with a piece of heavy steel pipe.

    Unlike the Porsche-specific P-203 crow's foot wrench, the box wrench fits the "wobble nut" with no interference. With 36 inch long lever arms breaking the nut free was surprisingly easy. The downside of course is that you can't use a torque wrench on the tubular handle 46mm box wrench. I found it possible to use the P-203 to apply the 75 ft-lbs (if I recall correctly--I haven't double checked) needed to tighten the "wobble nut."

    There's another potential problem, the special P-202 socket for gripping the end of the camshaft while tightening or loosening the camshaft nut:


    This is the second one I broke.
    Jim Alton
    Torrance, CA
    Early 911S Registry # 237

    1965 Porsche 911 coupe
    1958 Porsche 356A cabriolet

  10. #10
    Quote Originally Posted by NeunElf View Post
    Unlike the Porsche-specific P-203 crow's foot wrench, the box wrench fits the "wobble nut" with no interference...
    The SIR P-203 (R) is an aftermarket tool, and different than the genuine P203 (L) from Porsche.

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    Jon B.
    Vista, CA

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