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  1. #1
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    Merc 5L Alpha upper failure

    Hey fellas, happy new year!

    My first time venturing into the sterndrive forum is for a buddy of mine who's Alpha 1 Gen 2 upper lunched itself the other day (Bayliner 5L Merc). Would really appreciate a bit of advice if anyone could chime in. It's 24t/24t upper and 1.6x:1 lower. Lower seems otherwise in good shape other than maybe ingesting some filings from the upper - freshwater boat.

    Options are:

    1) get a new (SEI?) aftermarket upper for about $2400NZ (I see they're more like $1300NZ on Ebay, but problem is getting it here, shipping and border tax etc)

    2) get a complete secondhand Merc sterndrive (off a 4cyl boat) locally for about $1300NZ (will pop the top off to make sure the upper is in good shape and is also 24/24 tooth first). And sell the 2:1 lower to recoup some costs. If this upper is 24/24tooth, is it safe to assume it's otherwise identical to the stock v8 upper?

    Would appreciate any input from those of you in here that really know these drives - coz we don't!

    Cheers

    Gene

    Click image for larger version. 

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    Last edited by gmacrae; 01-02-2019 at 05:21 PM.

  2. #2
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    you need to pull the lower apart as well, as all that crap has gone down into it

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  4. #3
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    I would find a factory upper that has low hours or easy life behind a 4 cyl before I got an SEI. Thats saying something because they are 20 mins away from me not on the other side of the world
    Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster


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  6. #4
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    Good advice, thanks guys - looks like the complete 4cyl lower is the way to go - contacted the guy and we should have it next few days

  7. #5
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    A 4 cyl upper is going to have different gearing to your V8 one. In an alpha all the lowers are the same ratio, the uppers are where the ratios change.

    Edit - from memory the 5.0 has 1.5 or 1.6 to 1, the 4 cyl has 2 to 1.

    Also edit - damn just saw this post is a year old, I'm sure you've already figured all this out
    Last edited by Bremdanm; 01-12-2020 at 05:27 AM.

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