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Thread: Half Shell removal and install

  1. #1
    apriliaforum expert soyrico's Avatar
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    Half Shell removal and install

    I'm in the process of removing the crank case half shells. I don't have the spacial tool to remove the bearings. Can I use anything else to improvise? The manual says to apply heat to case. Anything very importent I should concider before removing and installing?
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  2. #2
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    my guess is you will need a baking owen for cooking cases at 200C before pressing bearings out, also thermogloves to handle all that and they should slide out with not much force...

  3. #3
    just another Aprilia fanatic amauri's Avatar
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    I don't use heat, just the two special tools.
    Also very important to mark the location on the case where the two halves split so you can put it back in the same orientation.
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  4. #4
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    Quote Originally Posted by amauri View Post
    I don't use heat, just the two special tools.
    Also very important to mark the location on the case where the two halves split so you can put it back in the same orientation.
    but it does help a lot, at least in my car background some bearings are heat pressed and I had even to use torch to set them free, they will either fall out or slide of something with no external force

  5. #5
    apriliaforum expert soyrico's Avatar
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    Thanks guys. I'll have the half shells installed by my local shop since I don't have the tool.
    A man who dares to waste one hour of time has not discovered the value of life. - Charles Darwin
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  6. #6
    just another Aprilia fanatic amauri's Avatar
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    Quote Originally Posted by soyrico View Post
    Thanks guys. I'll have the half shells installed by my local shop since I don't have the tool.
    Please make sure they understand that the half shells must be aligned exactly as they came out when pressed back in.
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  7. #7
    apriliaforum expert soyrico's Avatar
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    Can someone put the first 'Warning' note in layman's terms for me?
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  8. #8
    apriliaforum expert soyrico's Avatar
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    Well I got the half shells done but this doesn't look right. The yellow arrow points to the original manufacture marks where the shells were aligned. The red is were there at now. I have to ask why is this important. The shells have oil ports around the bearing and if I blow air in the oil passage it blows freely.

    I will take it back tomorrow to have them done correct.
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  9. #9
    just another Aprilia fanatic amauri's Avatar
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    Please excuse the rough sketch, I hope you can see what I'm trying to explain.
    The up/down load of the pistons/rods must be in the middle of the bearing shell, not where the two halves split.

    Probably not the end of the world if they are not perfectly aligned, since the load on the main bearings is absorbed by the rotating crank and divided by two rods/pistons.
    But when I see worn main bearings, they always show more wear in the area opposite the cylinders.
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    Last edited by amauri; 06-25-2010 at 09:12 PM. Reason: spelling
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  10. #10
    apriliaforum expert soyrico's Avatar
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    As always you make perfectly good logical sense. Thank you!
    A man who dares to waste one hour of time has not discovered the value of life. - Charles Darwin
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  11. #11
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    Quote Originally Posted by amauri View Post
    Please excuse the rough sketch, I hope you can see what I'm trying to explain.
    The up/down load of the pistons/rods must be in the middle of the bearing shell, not where the two halves split.

    Probably not the end of the world if they are not perfectly aligned, since the load on the main bearings is absorbed by the rotating crank and divided by two rods/pistons.
    But when I see worn main bearings, they always show more wear in the area opposite the cylinders.
    Thats exactly why all car crank and rod journal bearings are locked ehactly 90 dergees opposite to the piston, so all load is as Amauri explained above, and that makes perfect sense

  12. #12
    apriliaforum expert Danneh's Avatar
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    how to get main bearings out?

    How to get main plain bearings out of case halves? have special tools and rubber mallet.

    Stuck as sheep. tried to heat case half and cool the tool - nothing!

    Is there any trick to this?

  13. #13
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    Heat case to 250F using electrical oven. No hotter or you'll warp it. Once you drift the bearings out, Cool it down s l o w l y. (Put it back in the oven and turn it off.) This will reduce warping.

  14. #14
    just another Aprilia fanatic amauri's Avatar
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    Never tried using heat.
    I just use a hydraulic shop press, nothing fancy just an H press common to most repair shops.
    Never accept mediocrity, always demand competence.

    Certified Aprilia Moto Service in Southern California
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  15. #15
    apriliaforum expert Danneh's Avatar
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    Gonna try with the press later today

    So you are saying the half shells are made from aluminum..? They are magnetic however.

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