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Thread: Changing out a 912 80 HP in a model IV

  1. #11
    Senior Member Slyfox's Avatar
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    Default Re: Changing out a 912 80 HP in a model IV

    Quote Originally Posted by Wheels View Post
    I finished the tank tonight. It took about an hour to trim the extra length from the intake tube...
    you never did say what engine you were putting in. uls has the bigger starter yes, you need to bang the firewall in a little or something. also take the cover off your old water pump and put it on the new motor, the hoses will work out better if you do. get that cdi yes on the motor mount, all things will work out for this, all wires and stuff.
    steve
    slyfox
    model IV 1200-flying
    912uls
    IVO medium in-flight
    RV7A-flying
    IO-360
    constant speed prop

  2. #12
    Senior Member Slyfox's Avatar
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    Default Re: Changing out a 912 80 HP in a model IV

    now, just a heads up. I don't know if you have the newer mount or the old one that is 95 vintage. but the newer mounts have a thicker wall. the old mounts use to break all the time. I had one, I changed it over when I put in my new 912uls.
    steve
    slyfox
    model IV 1200-flying
    912uls
    IVO medium in-flight
    RV7A-flying
    IO-360
    constant speed prop

  3. #13
    Senior Member Wheels's Avatar
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    Default Re: Changing out a 912 80 HP in a model IV

    The new engine is an 80 HP Rotax just like the old one. The mount is the new style. I think your right about the water pump cover. I'll look into it.

  4. #14

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    Default Re: Changing out a 912 80 HP in a model IV

    Steve,
    You mentioned the older mounts breaking.. where did the breaks occur?
    I am reasonably sure I have an older mount in spite of the later date of original licensing of the airframe my engine came from.
    Bud

  5. #15
    Senior Member Slyfox's Avatar
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    Default Re: Changing out a 912 80 HP in a model IV

    pretty close to the tank, if you have the model 4. I'm trying to place it. usually having a wedge welded in the area helped, but that even broke on mine. nice to have a new motor mount. sorry I just can't picture it. I'll look and see if I had a picture of the old mount in my stuff.
    steve
    slyfox
    model IV 1200-flying
    912uls
    IVO medium in-flight
    RV7A-flying
    IO-360
    constant speed prop

  6. #16
    Senior Member Slyfox's Avatar
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    Default Re: Changing out a 912 80 HP in a model IV

    http://www.teamkitfox.com/Forums/alb...pictureid=6028

    this is where the crack is, see the pieces that are welded on. that's for support, it cracks there. right in front of the tank. there is two spots.
    steve
    slyfox
    model IV 1200-flying
    912uls
    IVO medium in-flight
    RV7A-flying
    IO-360
    constant speed prop

  7. #17

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    Default Re: Changing out a 912 80 HP in a model IV

    Steve,
    Thanks. I will be watching the mount closely and will watch that part of the mount specifically. Glad to have light gray paint since a crack should show as a black line.
    These bits of information are a valuable resource, a clear benefit of this forum. Thanks to all who contribute. I have made many changes and decisions based on the discussions.
    Bud
    IV 1200
    912UL

  8. #18
    Senior Member Slyfox's Avatar
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    Default Re: Changing out a 912 80 HP in a model IV

    what happened to me was I went to a flyin, richland wa. I had the tube break right off right where those supports are. The people in the shop next to the fbo went and welded the motormount for me so I could get back home. That held up until years later when I put my new engine in, of course I went to the 912uls from the 912ul and I didn't want that bigger engine on the old mount so I had John M. send a new mount with my new engine. So Happy with the new engine and the engine mount. love my fox.

    The new motor mount has a thicker wall on the tubing. well worth it.
    steve
    slyfox
    model IV 1200-flying
    912uls
    IVO medium in-flight
    RV7A-flying
    IO-360
    constant speed prop

  9. #19
    Senior Member Slyfox's Avatar
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    Default Re: Changing out a 912 80 HP in a model IV

    Quote Originally Posted by Wheels View Post
    The new engine is an 80 HP Rotax just like the old one. The mount is the new style. I think your right about the water pump cover. I'll look into it.
    the water pump cover has the tubes on at least one outlet rotated so a hose will make it to the water thingy on top better. trust me, you want that water pump cover. you should be able to reuse the gasket on your new motor. that is if it's a brand new one with 0 hours.
    steve
    slyfox
    model IV 1200-flying
    912uls
    IVO medium in-flight
    RV7A-flying
    IO-360
    constant speed prop

  10. #20
    Senior Member Wheels's Avatar
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    Default Re: Changing out a 912 80 HP in a model IV

    The tube cracking on the older engine mount might look like cracked paint, but a small magnifying glass will reveal metal flakes from the broken pieces chafing under vibration. Just put the new mount on if you experience that. Its a quick safe fix.

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