Results 1 to 7 of 7
  1. #1

    Reinstallation of Motor 780 SLX

    Any thing I need to know about re-aligning the engine when I reinstall? Im thinking(hoping) that I can use the old score marks on the motor mounts (damn I wish I would have marked them before removing). Would it be acceptable to install the motor, leave loose and install shaft then tighten the mutha up?


  2. #2
    Lake Mead Bum & BTLS Mark starflight's Avatar
    Join Date
    May 2007
    Location
    Boulder City, NV
    Posts
    3,364
    +1
    1
    I would feel more comfortable w/ an alignment tool. A little shift of the engine makes my alignment tool hard to insert.

  3. #3
    I would too but....I dont have one. Dont even know what an alignment tool looks like. Cant see buying one for one installation if I can get around it.

  4. #4
    Lake Mead Bum & BTLS Mark starflight's Avatar
    Join Date
    May 2007
    Location
    Boulder City, NV
    Posts
    3,364
    +1
    1
    Beerdart rents them.

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,591
    +1
    1,275
    Quote Originally Posted by Lockout View Post
    Any thing I need to know about re-aligning the engine when I reinstall?...
    Would it be acceptable to install the motor, leave loose and install shaft then tighten the mutha up?
    Not really.

    The purpose of the alignment process and the shims is not to make it easy to get the drive shaft installed, but to avoid any offset between the drive shaft centerline, the motor coupler, and the jet pump impeller.

    If the drive shaft ends up running with side or angled forces on the splines (because things are not aligned), the splines will suffer excess wear as they slide against each other with each rotation of the shaft.

    Sometimes, even if you do get the engine shims all back where they came from, the alignment can still be off, or it can be just fine. Can be hard to tell without the tool, even if the drive shaft seems to fit without binding, the alignment can still be off.

    The alignment tool is a long metal shaft, precision ground and very straight. You install a pump stator without the stub shaft or impeller, grease the tool, then slide it in through the pump stator bearings, then through the hull fitting, and into the engine coupler. If it slides into the coupler with almost no resistance, then the engine is aligned.

  6. #6
    ph2ocraft's Avatar
    Join Date
    Apr 2006
    Location
    Campbell, Ca.
    Posts
    14,100
    +1
    105
    Quote Originally Posted by Lockout View Post
    Any thing I need to know about re-aligning the engine when I reinstall? Im thinking(hoping) that I can use the old score marks on the motor mounts (damn I wish I would have marked them before removing). Would it be acceptable to install the motor, leave loose and install shaft then tighten the mutha up?
    Rent the tool from BD and take the worry about ruining couplers, driveshafts and/or impellers off your "what could ruin my trip this weekend" list.

  7. #7
    Understand...so it sounds sort of line the tools we use to use in the machine shops to check spindle alignment. PS - My engine did not have any shims believe it or not. I was suprised myself. I figured there would be some sort of shiming from the factory. Nuthin. Nuts and washers...Dats it. Either polaris didnt care or my hull was aligned perfectly.

    I will get with BeerDart when I get the engine back together.

    Thanks ya'll.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. All sorts of problems with slx 780
    By Beachbum3478 in forum Polaris Open Discussion
    Replies: 2
    Last Post: 09-06-2011, 11:14 PM
  2. 96 780 slx complete lower and upper motor rebuild
    By gutterboy in forum Polaris Open Discussion
    Replies: 0
    Last Post: 11-23-2010, 01:01 AM
  3. 780 SLX Has a 1050cc motor in it?
    By johnnyrod in forum Polaris Open Discussion
    Replies: 4
    Last Post: 09-07-2008, 08:06 PM
  4. '96 780 SLX pre-season inspection :(
    By vanlohd in forum Polaris Open Discussion
    Replies: 61
    Last Post: 05-21-2007, 07:07 AM
  5. life of motor with stage II and ECU????????
    By Jrsrxp in forum 4-Tec Performance
    Replies: 6
    Last Post: 09-30-2006, 09:04 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •