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  1. #1
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    Briggs 5HP Model 130202

    I have enjoyed the restoration on a 2HP 60102 from 1975, still need to finish the cosmetics, paint etc, but it is running smooth.

    With my success on that project, I got the itch to find a 5HP Briggs to work on that might be a fit for my Keystone project bike.

    I ran across a 130202-0135-11 Briggs motor with mfr date 1981 which I pulled off an old tiller that was being scrapped.

    I knew going in that it probably had a busted rod and after disassembly that's exactly what I found.

    This is a learning project for me.

    The cylinder does not look too terrible given what happened to this engine, opinions welcome.

    The piston and even the rings seem to be in good shape but I have not yet checked the gap, etc.

    There are no breaks or cracks in the block or sump cover.

    From my reading, the crank has what I understand are aluminum deposits from the rod heating up at time of failure on the crank journal.

    My hope was to be able to get a replacement rod and be able to repair and use this crank.

    Is that feasible and what is the best process? From my reading thus far I have seen advice ranging from emery or very fine wet sanding, muriatic acid, and lye.

    Thanks in advance for any advice from the experts around here including whether using this as a starting point has chance of success in getting it operational.


    130202_CYLINDER.JPG

    130202_CRANKSHAFT.JPG

  2. #2
    CarPlayLB's Avatar
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    Muriatic acid will make quick work of that. I don't know that I would sand it! The acid is very caustic, so please use caution...in the great outdoors. It will also eat anything near the container, so buy as little as you need and dispose of properly! Make sure you coat it with oil when done...you can almost see the rust starting if you don't!

  3. #3
    OND's Avatar
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    As CarPlay said ...muriatic acid is your best bet .
    Lil Indian, Ruttman, DB30, Warrior, lil Bill, EZ Rider, Savage SSC , Powell, BONANZA

  4. #4
    Senior Member Fantic Freddy's Avatar
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    Me too, I use it to clean rusty gas tanks. It's nasty sh*t, use caution. I dispose of it in my neighbor's swimming pool, after his dog poops in my yard.
    Last edited by Fantic Freddy; 01-11-2018 at 11:15 PM.

  5. #5
    Junior Member
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    I appreciate the feedback.

    I've used muriatic acid in my handyman history to remove old mortar from tiles needing to be reused for a customer I was doing repairs for.

    I learned the hard way that the fumes will rust anything within its range. Ruined alot of tools that week.

    Should I create a contraption so I can soak just that area of the crank or should I brush it on repeatedly?

  6. #6
    Dr. Shop Teacher's Avatar
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    I did a quick thread on using muriatic acid awhile back. I got a couple of plastic paint containers and notched them to fit the crank (use two so the container does not collapse). The acid really puts out fumes as it first starts eating the aluminum, it'll slow down as the deposits lessen. I moved my cars 200 ft away and kept the dogs inside as it was working (about 3 hrs for me). I recycled the acid into it's container for later disposal. I later used 2800 wet to polish the rod journal and, as Carplay said, oiled it up.
    Wilderness~Copperhead~Trail Bike

  7. #7
    Junior Member
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    Here is the result of the crankshaft clean up. Still want to polish it as suggested by others but there does not appear to be any damage to it once I cleaned it up.

    130202_CRANKSHAFT_AFTER.JPG

    This flywheel key certainly looks like it took a beating and is partially sheared. I am still new to this but I don't believe it is supposed to be offset like this.

    130202_FLYWHEEL_KEY.JPG

    In looking up part numbers, it appears that most 2 - 5hp Briggs just use the same key, Part No. 222298S?

 

 

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