SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    Jun 2004
    From
    Canada
    Posts
    57

    Default Rotary valve oil change

    Hi, here's a question: Is there an easy way to change out the oil in the rotary gear cavity on my 91 GT 580 without a hull full of oil? How the heck do you get down there at the oil line and get the oil out without making a big mess?

    Thanks, Joe

  2. #2
    Joined
    Feb 2004
    From
    New Jersey
    Posts
    2,601

    Default Re: Rotary valve oil change

    theres no reasion to change the oil unless your changing brans or if you have water in your oil , but what you can do is pull the oil line from the return line on the tank and pump it out with a drill pump .
    PRIDE IN SERVICE<br /> <img src="http://www.sbtontheweb.com/images/forposts/4609/1.jpg" alt=" - " />

  3. #3
    Joined
    Jun 2004
    From
    Canada
    Posts
    57

    Default Re: Rotary valve oil change

    Thanks for the reply.

    Since i believe my rotary valve seal is weeping, I was wondering if I could remove the oil pump, put on the block off plate, run premix, and put 80W90 gear oil in the tank just for the rotary shaft/gear area.

    I know it's not the *right* thing to do, but I don't have the time/money to do a major overhaul on this old, seldom used machine.

    What do you think?

    Joe

  4. #4
    Joined
    Aug 2004
    From
    Ohio
    Posts
    134

    Default Re: Rotary valve oil change

    I run 15w40 pennzoil in my tank with a ball valve on the oil line,

    All I do is take the seat off before I crank it and turn on the valve, I need to do that anyways to make sure there are no fumes in the ski...After I finish riding I turn it off and park it...

    simply but you must turn the valve on!!

  5. #5
    Joined
    Jun 2004
    From
    Canada
    Posts
    57

    Default Re: Rotary valve oil change

    Hi, why 15w40? Motor oils have detergent in them, and other additives to deal with combustion byproducts. Gear oil has anti-wear additives to work best with preventing friction on gear sets, bearings, etc. If it's only for the rotary valve gear, gear oil should be sufficient. ?

    However I do remember something about certain standard transmissions that call for #50 oil, and don't recommend 80w90 gear oil. Anyone??

    How is your seal leakage/smoking with the 15w40? Using any?

    Joe

  6. #6
    Joined
    Aug 2004
    From
    Ohio
    Posts
    134

    Default Re: Rotary valve oil change

    dont smoke and dont leak, the oil is thicker than the 2 stroke oil so it doesn't leak at all


    Why 15w40? Because I have a unlimited supply, so it is cheapest. (free) lol

  7. #7
    Joined
    Jun 2004
    From
    Canada
    Posts
    57

    Default Re: Rotary valve oil change

    How much oil were you using before? Lots of smoke? I suppose 15w40 is good diesel oil. Maybe it will burn off better than gear oil with what leakage there still will be. Don't know what the extra sulphur and phospher additives in gear oil would do in a combustion environment.

    I dumped the oil out of my tank in preparation of the changeover. I need to get a block off plate and remove my pump yet. Where are they available? I've got the old 587 Rotax.

    Joe

  8. #8
    Joined
    Nov 2003
    From
    Glendora, CA
    Posts
    6,846

    Default Re: Rotary valve oil change

    I dumped the oil out of my tank in preparation of the changeover. I need to get a block off plate and remove my pump yet. Where are they available? I've got the old 587 Rotax.

    Joe[/QUOTE]

    Joe, try calling SBT. They sell blockoff kits.
    Bill O'Neal <br>
    WCM
    <a href="http://www.watercraftmagic.com"

  9. #9
    Joined
    Aug 2004
    From
    Ohio
    Posts
    134

    Default Re: Rotary valve oil change

    Quote Originally Posted by joedash
    How much oil were you using before? Lots of smoke? I suppose 15w40 is good diesel oil. Maybe it will burn off better than gear oil with what leakage there still will be. Don't know what the extra sulphur and phospher additives in gear oil would do in a combustion environment.

    I dumped the oil out of my tank in preparation of the changeover. I need to get a block off plate and remove my pump yet. Where are they available? I've got the old 587 Rotax.

    Joe
    Walked into my local dealer and bought one for 11.00 so I would try local first.

  10. #10
    Joined
    Jun 2004
    From
    Glendora California
    Posts
    812

    Default Re: Rotary valve oil change

    Quote Originally Posted by BlackBird1
    Walked into my local dealer and bought one for 11.00 so I would try local first.
    Yeah, by all means don't spend money with SBT.............
    Bill O'Neal, owner of Watercraft Magic in Glendora California, www.watercraftmagic.com

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