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  1. #1

    Default Small gouge out of lower unit

    Hey guys, was hoping for some advice on the best way to repair a small gouge/chunk made in my lower unit while being move (picture attached). ThanksClick image for larger version. 

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    Last edited by Snapper Fisho; 11-20-2019 at 06:03 PM.

  2. #2

    Default Re: Small gouge out of lower unit

    Weld it or epoxy it.

  3. #3
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    Default Re: Small gouge out of lower unit

    Or leave it alone

  4. #4
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    Default Re: Small gouge out of lower unit

    Clean and prep it...I perfer aluminum Devcon epoxy.
    Pappys Sales and Service
    Owner and Factory Certified Technician
    Former racer KDBA (Kentucky Drag Boat Association)

  5. #5

    Default Re: Small gouge out of lower unit

    Thanks for the replies everyone. How thick is the gearcase wall there as it is around a 3mm gouge there but luckily not right through to cause an oil leakage. A bit uncomfortable to just leave it alone. Cheers.

  6. #6
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    Default Re: Small gouge out of lower unit

    Lil over 3/16""
    Pappys Sales and Service
    Owner and Factory Certified Technician
    Former racer KDBA (Kentucky Drag Boat Association)

  7. #7

    Default Re: Small gouge out of lower unit

    Quote Originally Posted by faztbullet View Post
    Lil over 3/16""

    So about 4.8mm thickness? That means there's about 1.2mm of the wall left. Lucky it was not worse. Thanks.

  8. #8
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    Default Re: Small gouge out of lower unit

    I have a mig and do repairs like this, but a good cleaning and epoxy would give a similar measure of protection. Just by slim happenstance it gets struck in the same place, you should do something with it.

  9. #9
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    Default Re: Small gouge out of lower unit

    Aluminum brazing works well for this type of repair.-----I started using a product like ----LUMIWELD----back around 1980 or so.----And it works well.----Many other brand names out there too.

  10. #10
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    Default Re: Small gouge out of lower unit

    Excellent suggestion. This would give that protection with better adhesion and strength. Practice first on a similar casting.

  11. #11

    Default Re: Small gouge out of lower unit

    Quote Originally Posted by racerone View Post
    Aluminum brazing works well for this type of repair.-----I started using a product like ----LUMIWELD----back around 1980 or so.----And it works well.----Many other brand names out there too.
    Thanks so much guys! I didn't know about brazing and was going to use an epoxy but will look into this. I'm from Australia and have found the Johnson V4 outboard from the 80's a really good durable motor over the years.

  12. #12

    Default Re: Small gouge out of lower unit

    Just found this on a forum down here about aluminium brazing.....not confident after reading it. Would rather someone very experienced to do it this way if possible. Cheers.

    https://forums.whirlpool.net.au/archive/2160891

  13. #13
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    Default Re: Small gouge out of lower unit

    Excellent, enjoyed the reading, lots of good information there as well. I do a fair amount of prop and skeg repair, often welding cracks too. May shops will use annealed aluminum for skegs, bad idea. I keep cast alum with cast alum and use skegs off of parts motors. Use a couple of different filling alloys, sometimes welding complete blades on useable prop hubs.

  14. #14
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    Default Re: Small gouge out of lower unit

    Here is a recent job on a Johnson 75. Did prop repair too. Basecoat acrylic enamel and topcoat epoxy clear. Beyond factory specs.
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    Last edited by timguy; 11-21-2019 at 07:45 PM.

  15. #15

    Default Re: Small gouge out of lower unit

    Quote Originally Posted by timguy View Post
    Here is a recent job on a Johnson 75. Did prop repair too. Basecoat acrylic enamel and topcoat epoxy clear. Beyond factory specs.
    That is really impressive timguy. Brilliant final outcome. The Johnno 75 looks new again!

  16. #16
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    Default Re: Small gouge out of lower unit

    Talk to a good welder, they'll tell you it's 50 percent welding and 50 percent "artwork". Nice paint helps the owners "feel comfortable" that what's underneath is gonna work well too. It's not putting a bowtie on a pig, it's more like putting a bowtie on a Playboy bunny. What really counts? The bowtie, or what's underneath it?

  17. #17

    Default Re: Small gouge out of lower unit

    Quote Originally Posted by timguy View Post
    Talk to a good welder, they'll tell you it's 50 percent welding and 50 percent "artwork". Nice paint helps the owners "feel comfortable" that what's underneath is gonna work well too. It's not putting a bowtie on a pig, it's more like putting a bowtie on a Playboy bunny. What really counts? The bowtie, or what's underneath it?
    That's a good way to put it.

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