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328 need new rotor arm?

Discussion in 'Technical Q&A' started by Iain, Jul 10, 2005.

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  1. Iain

    Iain F1 Rookie

    Jan 21, 2005
    3,348
    UK
    #1 Iain, Jul 10, 2005
    Last edited by a moderator: Sep 7, 2017
    Been doing a few bits & pieces on my 328 this weekend & pulled the rear bank dizzy cap & plug wires (largely to test the wires - chasing a lumpy idle).

    Wires all tested OK for continuity & resistance (at least the readings I got were fairly evenly spaced in line with the length of the individual leads)

    Looked at the rotor arm & the 4 pegs inside the dizzy cap & all are quite pitted. Attached is a photo of the rotor arm - does this look like it needs replacing, do I leave it alone or should I try & clean the pitting up a bit?

    rgds

    Iain

    Edit:: Bloody hell!! I've just had a look at what new Dizzy caps & Rotor arms cost - £135 & £99 ($240 & $175) repectively - that's insane!!

    I.
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  2. Verell

    Verell F1 Veteran
    Consultant Owner

    May 5, 2001
    7,022
    Groton, MA
    Full Name:
    Verell Boaen
    #2 Verell, Jul 11, 2005
    The rotor contact doesn't look too bad to me.
    I'd either just live with it, or dress it up a bit with a very fine file or 320 grit sandpaper. At most bring the high points down to the metal's original surface. Any more material removal will increase the rotor-distributor contact gap, weakening the spark & increasing the possibility of carbon tracks forming.
     
  3. Iain

    Iain F1 Rookie

    Jan 21, 2005
    3,348
    UK
    #3 Iain, Jul 11, 2005
    Thanks for that. I was reluctant to start messing with it figuring that anything I took away would only increase the gap as you suggest.

    I took the cap of the front bank tonight & its much the same - the four posts on both caps are quite pitted as well. I'm going to take them down to QV tomorrow & get Mike to take a look at them.

    rgds

    I.
     

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