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  1. #1
    PWCToday Newbie
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    Js550 crank seals

    Hi guys, I'm currently reassembling my js550 and can't work out which way the three crank seals go, does anyone have a diagram? Many thanks

  2. #2
    PWCToday.com Is My Home Away From Home mcn6's Avatar
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    Re: Js550 crank seals

    Rubber coated side faces inside toward the crankshaft.



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  3. #3
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    Re: Js550 crank seals

    So the metal spring band always faces the outside on the seals ? 1 looks different to the other 2 tho?

  4. #4
    PWCToday.com Is My Home Away From Home mcn6's Avatar
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    Re: Js550 crank seals

    Do you have two double lip seals (springs on both sides) and one single lip seal (spring on one side) or do you have three double lip seals?



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  5. #5
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    Re: Js550 crank seals

    Quote Originally Posted by mcn6 View Post
    Do you have two double lip seals (springs on both sides) and one single lip seal (spring on one side) or do you have three double lip seals?
    I have 2 double lipped and one single lipped with a more flatter front to the face of it

  6. #6
    PWCToday.com Is My Home Away From Home mcn6's Avatar
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    Re: Js550 crank seals

    The two double lip seals are your main seals and rubber coated side on both double lip seals face the crankshaft. Single lip seal is supposed to keep bilge water away from the rear main seal and it goes at the back after the rear double lip seal, again with rubber coated side facing the crank (spring outside).



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  7. #7
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    Re: Js550 crank seals

    So the stator side has the flat side facing the crank and the lip and spring facing the stator? And the rear the lip and spring face the prop in the inside and the single lip
    Faces the prop also ? Is that correct

  8. #8
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Js550 crank seals

    Quote Originally Posted by Dutchyboyyyy View Post
    1 looks different to the other 2 tho?
    The 2 main seals have a metal side and a rubber side, right?
    On the front main seal the metal side points out towards the
    stator.

    On the rear main seal the metal side points out towards the coupler.

    The one that looks different is the coupler seal. It has a flat rubber
    side that faces the metal side of the rear main seal. The side with
    the spring faces the coupler.

    The front and rear main seals use 2 spring tensioned lips to seal
    pressure and vacuum for each cylinder.

    The coupler seal is there to prevent water from getting near the
    rear main seal, that is why the spring points outward.

    Be sure to lightly grease the inside of each seal. Use a light grease.
    I like Lucas Red "N" Tacky Grease
    If you put too much grease on the seal lips, they will fail a pressure/
    vacuum test.

    If you want to add grease between the rear main seal and the coupler
    seal. I recommend to only fill it to the top of the crank (just over half
    way). That way it will supply grease to the coupler seal, but not too
    much grease.


    Bill M.
    Horsepower == Speed, RPM != Speed



  9. #9
    PWCToday Regular Attacking Mid's Avatar
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    Re: Js550 crank seals

    The document below was straight from a Kawasaki publication. Personally, I like to use 3 x 92049-3006 and orient them as in the last picture for the JS550-C1. The only difference from that picture is that the rear outer seal is a 92049-3006 rather than a 92049-3005.

    The previous posters have suggested running the rear inner seal backward from what Kawasaki suggests (if I understand them correctly). Perhaps they could explain their reasoning? I have a suspicion that either way will work fine.

    AM.

    Crankshaft Seal Orientation.pdf
    Last edited by Attacking Mid; 05-20-2017 at 08:40 AM.
    1986 JS550 Ported, PJS head, SBN44, Enlarged water passages, Skat 12/15, OP Rideplate, Westcoast grate

    1989 JS650SX Milled head, Dual BN38's, Rear Exhaust, Enlarged water passages, SS impeller, OP Rideplate, L&S grate

    1992 JS550 SX $100 "barn" find

  10. #10
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Js550 crank seals

    Quote Originally Posted by Attacking Mid View Post
    The previous posters have suggested running the rear inner seal backward from what Kawasaki suggests (if I understand them correctly).
    I got my recommendation backwards, I would normally install the main seals
    with the metal side in, just like the rear main seal for 550 pp and reed.

    Not metal side out on the front main seal like I originally posted.

    Quote Originally Posted by Attacking Mid View Post
    Perhaps they could explain their reasoning?
    First, in the 1980's, we copied the orientation of the 440/550 pp rear
    main seal.


    It was the seal that we would install on the front and coupler sides too (big
    spring out on the coupler).

    I would need to look at a main seal, but I remember 1 spring being slightly
    larger than the other (Kawasaki oem seals/not aftermarket). The larger
    diameter spring controlled the pressure side of the seal (crankcase) and the
    slightly smaller diameter spring controlled the vacuum side of the seal
    (outside the crankcase).

    Another possibility is the seals I installed in the 80' & 90's were slightly
    different than the 550 reed main seals, and the only reason why I think it
    is even possible is the time it took to exhaust the supply of main seals from
    existing inventories. On the other-hand Kawasaki should have given it a
    new 92049-37xx part number.

    I prefer 3 92049-3006 seals too, but I have never installed them like
    Kawasaki's JS550 C1 diagram.


    Thanks for posting Attacking Mid! I am glad you brought that up.


    Bill M.
    Last edited by wmazz; 05-20-2017 at 03:08 PM.
    Horsepower == Speed, RPM != Speed



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