My never ending 112 project.
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Thread: My never ending 112 project.

  1. #1
    Senior Member
    Display Name: Nate
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    My never ending 112 project.

    I believe itís time to replace the HH100 in my Ď67 112. A few years ago I picked up a great donor engine. Itís a HH100 out of a Sears tractor. Itís a Solid State engine so itís of low hours or at least looks as such. When I went to look at the engine, the seller allowed me to remove the head to inspect the cylinder and piston. Itís a standard piston in a relatively unworn cylinder. Iím planning to disassemble this engine shortly and also disassemble the original engine. My original engine breathes really hard and is worn well past a rebuild. Two years ago I pulled the head to decarbon and saw the cylinder to be worn to the point I can fit over .060Ē feeler gauge between the cylinder and piston! That was when I started searching for a replacement engine. I need to inspect both engines to see if there will be any other parts needed. Iím already assuming Iíll need to use the original camshaft (I sure if the solid state camshaft has the eccentric for the points plunger), and use the side cover since I donít think Iíll be good enough to drill the points plunger hole. Being this is working tractor I want to do this as best as possible with longevity as the main goal. So Iím not sure yet what Iíll do as far as bearings. Iím noticing in all the rebuild kits Iíve found, none come with bearings, so Iím assuming as long as the ones I have are in good shape, that Iíll reuse them. Iím also not sure what Iíll do as far as piston goes. Iíll have to decide that once itís disassembled and measured.
    1966 60 (Soon to be 12 HP), 1985 111
    1967 112, 1966 110
    46 Mower Deck, Modified 31 Tiller, 36 Snowblower, 42 Blade
    21 Power Drive

    Custom Mini Wagon

    Brinly CC-500
    Hinson No 1977&1978 Weather Shield

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  3. #2
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    Display Name: Roger Henning

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    Look very carefully at the bottom of the crankcase where it bolts to the tractor. I suspect you will find the sump area of the Sears will be much larger than the JD engine which will make fit problems in the swap. Roger

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    Display Name: beavermeadow

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    As I start to sell my JD 3 hydrolic 112 JD's 1967 RF , 2 1968 SF and attachments. I also have 2 HH100 engines as spares. I also have rebuild parts.
    I have to make a list of all the JD stuff I have. I would love to sell it all together to someone who, like me , rebuilds this JD stuff. I will work on getting it together i Jan 2020 . If there is something you need, let me know.
    I might have it.
    Gene In Shelton Ct. 203-767-6762

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  6. #4
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    Display Name: Roger Henning

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    I will add some pictures of what I am talking about. The Yellow block is Sears and the Green is JD. Roger
    Attached Images Attached Images

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  8. #5
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    Display Name: Nate
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    I’m not sure what it came off of, but it is definitely an HH100, and the serial tag is Sears.
    288DFB98-8B1E-45B8-BBCF-29EB9010D5A9.jpg
    6F8F6C01-F6A4-4DE6-8999-0699F9726885.jpg

    The only sump issue I’ve seen so far is the oil drain location. Hopefully there is a casting boss in the bottom to be able to drill and tap for the correct drain location for my RF.
    1966 60 (Soon to be 12 HP), 1985 111
    1967 112, 1966 110
    46 Mower Deck, Modified 31 Tiller, 36 Snowblower, 42 Blade
    21 Power Drive

    Custom Mini Wagon

    Brinly CC-500
    Hinson No 1977&1978 Weather Shield

  9. #6
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    So the specs for piston to wall clearance is .006”-.008”. This engine is at .008”, so I’ll leave the std piston in it as long as I don’t find anything to change my mind. Now to open it up and see if I need to swap cams and inspect bearings.
    1966 60 (Soon to be 12 HP), 1985 111
    1967 112, 1966 110
    46 Mower Deck, Modified 31 Tiller, 36 Snowblower, 42 Blade
    21 Power Drive

    Custom Mini Wagon

    Brinly CC-500
    Hinson No 1977&1978 Weather Shield

  10. #7
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    Display Name: Sublime68charger
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    Best of luck for your rebuild process!

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    Opened up the donor HH tonight. I’m pretty happy so far with what I’m seeing. Cylinder is straight and true. Drained dark oil with no metal in it. I will need to reuse camshaft from original engine as this cam doesn’t have the points lobe. But that’s not a problem since I need the points side cover anyways. Bearings all look good. I don’t even think I’m going to install new rings! Plus I haven’t found any for less than $60 even though I can get a std piston with rings and wrist pin for $45... which I don’t understand. But all in all a good night.
    1966 60 (Soon to be 12 HP), 1985 111
    1967 112, 1966 110
    46 Mower Deck, Modified 31 Tiller, 36 Snowblower, 42 Blade
    21 Power Drive

    Custom Mini Wagon

    Brinly CC-500
    Hinson No 1977&1978 Weather Shield

  12. #9
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    Display Name: Nate
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    Parts are scheduled to be delivered tomorrow, so hopefully I can get out to the garage this weekend and pull the engine off the tractor and disassemble the needed parts from it and put the replacement together. With this tractor being already painted a non-correct shade of green that I couldn’t even begin to match without going to my paint shop and spending $35 for a can of matched paint I’ve decided to paint this engine satin black which I believe to be the color used on Tecumseh’s replacement engines. If I’m not correct about the replacement engine color, please let me know.
    1966 60 (Soon to be 12 HP), 1985 111
    1967 112, 1966 110
    46 Mower Deck, Modified 31 Tiller, 36 Snowblower, 42 Blade
    21 Power Drive

    Custom Mini Wagon

    Brinly CC-500
    Hinson No 1977&1978 Weather Shield

  13. #10
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    Display Name: Nate
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    All parts are here and even though it’s 60 degrees out. I just realized this isn’t the best time of year to pull out the engine....
    4D6322E0-C080-4703-8B0D-5222DC9291A1.jpg

    Ok, step one. Remove front part of cab.
    1966 60 (Soon to be 12 HP), 1985 111
    1967 112, 1966 110
    46 Mower Deck, Modified 31 Tiller, 36 Snowblower, 42 Blade
    21 Power Drive

    Custom Mini Wagon

    Brinly CC-500
    Hinson No 1977&1978 Weather Shield

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