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  1. #1
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    16,767

    Default Converting a metric starter to an SAE design

    Mercruiser 5.0 230 hp 1986. Starter is held by two 3/8 UNC body bolts that fit tight in the holes to align the starter.

    New starter is for the later, metric engines and uses slightly larger 10 mm body bolts. This allows the metric starter to move around with the smaller 3/8 bolts.

    The "solution" according to the manufacturer is to use "conversion bolts" that have 10 mm bodies that slim down to a 3/8 UNC thread. Swell, but nobody makes the damn thing (and I spent a long time looking). So...

    Made up for the slop by wrapping the bolts with 5 or 6 layers of aluminum foil tape. This is great stuff with lots of uses. Starter is now solidly located and works great.

    Jeff

  2. #2
    Join Date
    May 2020
    Location
    Stokesdale NC
    Posts
    168

    Default Re: Converting a metric starter to an SAE design

    One other possible way would be to take your 10 mm bolt and cut some 3/8 threads on it with a threading die.

  3. #3
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    16,767

    Default Re: Converting a metric starter to an SAE design

    Boy, am I ever embarrassed! I meant to post this on the Mercruiser forum and I... Doh!

    Jeff

  4. #4
    Join Date
    May 2020
    Location
    Stokesdale NC
    Posts
    168

    Default Re: Converting a metric starter to an SAE design

    Think about it this way, a good idea is always appropriate, the principal applies here as well. Glad that you got your problem sorted out but keep an eye on those bolts, foil is very soft and things may loosen up with time and use.

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