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Thread: Sl 650 rebuild

  1. #1

    Sl 650 rebuild

    Im rebuilding a 95 sl 650. 3 crank bearings are bad and threw a rod and shattered a piston. I got all new rings, rods, bearings, and crank coming. I have 5 question that i need to ask before rebuilding it. 1. How to position head gaskets. 2. Torque specs on jug. 3. Torque specs on heads. 4. Is there a top and bottom on the stator? 5. Crank case seal what do i use? Thank you for any information. Any other information would be greatly appreciated as well.


  2. #2
    Polarisitis loonatik's Avatar
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    1. Head gasket, as standing on the carb side, the word "UP" is at lower left corner.
    2. Base = 28 ft.lbs
    3. Head = 18 ft.lbs
    4. There's a alignment mark on the stator, it should center up between top and bottom crank case on the carb side.
    http://www.greenhulk.net/forums/show...ignment-help#6
    5. I used RTV hi-temp on mine. Hopefully someone will chime in with the proper sealant.

  3. #3
    Thanks a bunch. But where does the tab on the head gasket go?

  4. #4
    johnsonmtz's Avatar
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    Quote Originally Posted by Polaris28 View Post
    Thanks a bunch. But where does the tab on the head gasket go?
    Tabs don't matter on these. As Loonatik said, there is the word "UP" stamped into the gasket. If you have the letters oriented so you can read them and the are in the 8 o'clock position (with the intake toward you) the gasket will be in the proper location.

    I believe many on here use Yamabond to seal the case halves.

    KJ

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk.

    Please get your hands on a repair manual and read it before you assemble the engine. Proper torque specs and sequences will need to be followed.

    Also don't tighten the cyl base nuts until you temporarily install the exh manifold. ZOtherwise you might have gasket issues.

    And make sure to do a leak down test after assembly.

  6. #6
    may i ask what you need to temporarily install the exhaust for what kind of gasket problems? Thanks for all the answers.

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Finger tighten the exh manifold bolts to the cyls. This aligns the cylinders before you torque the cyl base nuts.

    If you don't, and the cyls are slightly mis aligned and torqued down, when you torque the exh manifold later it will "pull" the cyls into alignment and possibly damage the cyl base gasket seal causing you an air leak.

    Air leaks into the engine will cause piston failures.

    And that's why it's very important to do a leak down test after engine assembly.

  8. #8
    Makes sense never thought of that nor heard that. Thanks for the great info. What exactly do i have to do for a leak down test?

  9. #9
    what should the crank case be torqued to as well?

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    This will help with some of your Q's

    http://www.greenhulk.net/forums/show...-750-780-785-s


    As for the cases, there are 3 different torque specs and a proper sequence. Get a repair manual please.

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