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Thread: Through bolt on 75Z alternator

  1. #1
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    Default Through bolt on 75Z alternator

    Dear Fellow Z Enthusiasts:

    I just noticed I am missing one of the through bolts on my 1975 280z alternator, the lower one of the three. These are show on page EE-16 of the FSM in figure EE-35, but the FSM doesn't give a diameter, thread length or length for the bolts. While searching another forum, I found this:

    The alternator has 2 12mm headed bolts at the base, and a 14mm head bolt on the adjustment bracket on top. The connections on the back are 10 and 8mm. You take the three mounting/adjustment bolts loose, take the wires off the back, and take the alternator up and out to the rear of the radiator hose towards the oil filter.
    Piece of cake.

    If this is correct, then I lost one of the 12mm bolts. As I can see this is putting tremendous pressure on the other bolts (the alternator is vibrating), I'll need to fix this right away.

    Can anyone provide a description so I can head to Pepboys (which is still open the day before Christmas), or is this something I must try to negotiate with my local not-very-. helpful Nissan dealer?

    Thanks very much for help/advice.

  2. #2
    Rust Free'ish zKars's Avatar
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    Default

    Take the other lower bolt out and take it with you to be sure, but all the spare engine alternator brackets I have are threaded with a 8mm x 1.25 thread. About 30-35 mm long should do it.
    Last edited by zKars; 12-24-2011 at 12:29 PM.
    -----------------------------------------
    Jim
    73 240Z HLS30 149331
    69 510 PL510 77603

    www.zKars.com
    www.calgaryzclub.ca
    Reference materials
    www.xenonS30.com

  3. #3
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    Default Thanks for the information

    Quote Originally Posted by zKars View Post
    Take the other lower bolt out and take it with you to be sure, but all the spare engine alternator brackets I have are threaded with a 8mm x 1.25 thread. About 30-35 mm long should do it.
    Thanks very much for the information. I think, after looking more at the FSM and at my Chiltons, that I might have asked the wrong question. The bolt that has gone missing is the one that connects the alternator to the block. Is this bolt also of the same length?

    Again, I appreciate the help and guidance.

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