Guide: Preparing a block for a Big bore cylinderkit (part 4)

Discussion in 'Scooter Guides' started by HasSse666, Nov 18, 2012.

  1. HasSse666

    HasSse666 Member

    Messages:
    80
    I will mount the bearings and crankshaft using cold and heat.
    If you cool a shaft of metal, it will shrink.
    Warming to a ballbearing, makes the hole in the ballbearing to expand.
    This I will use to get the ballbearings in place

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    Picture 01
    Rinse off the ballbearing with gasoline so it will be thoroughly clean
    NOTE
    Use gloves

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    Picture 2
    Blow the ballbearing with compressed air and put the ballbearing in a plasticbag
    Then place the bag with the ballbearing in the freezer overnight
    NOTE
    Do not let the balls spinning too fast

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    Picture 3
    Clean the crankshaft in the same way and put it in a plasticbag in the freezer

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    Picture 4
    Heat the block to about 100 degrees celsius (max 120 degrees) with a heatgun
    Tip
    Splash some water on the block if it sizzles, it's 100 degrees

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    Picture 5
    Picking up the ballbearing from the freezer cool down a bit more with the coolingspray
    Tip
    Let the ballbearing to rest a while before mounting and heat the block meanwhile

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    Picture 6
    Drop bearing straight down in block
    Tip
    If bearings stops
    - Tap on the outer edge of the bearing with a plastichammer

    Do the same with the ball bearing to the second block half

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    Picture 7
    Preheat your ballbearing in the big block half

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    Picture 8
    Now take the crankshaft out of the freezer and cool it a little extra

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    Picture 9
    Hold crankshaft straight and drop down into the block
    NOTE
    - Make sure you turn the crankshaft right path
    - Make sure the rod ends up in the right place

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    Picture 10
    I attach the crank assembly tool on the crankshaft
    Do not overtighten
    The tool aligns the crankshaft in the block

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    Picture 11
    Apply gasket sealant on the block

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    Picture 12
    Heat the ball bearing

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    Picture 13
    Cool crankshaft properly
    Tip
    Wipe off icecrystals from the crankshaft before installing

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    Picture 14
    Drop the blocks half at the crankshaft

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    Picture 15
    Tighten the bolts crosswise using a torque wrench


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    Picture 16
    Remove the alignment tool

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    Picture 17
    Check that the crankshaft rotates easily
    NOTE
    - Minimum chop makes ballbearings wear out prematurely
    - You may be required to center the crankshaft in the block if you pulled too much or too little with alignment tool
    - You can do this by pressing with a puller from either direction

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    Picture 18
    Lubricate the crankshaft and the bearing

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    Picture 19
    Grease sealings with grease and push on the shaft

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    Picture 20
    Press the bearings down with a pipestub
    Then do the same with the otherone

    Done!
    Hope this guide could help you.

    Check out the clip, it tends to be easier to understand
     

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