Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13
  1. #1
    WAVEATER WAVEATER's Avatar
    Join Date
    Nov 2007
    Location
    LAKE DUBAY WISCONSIN
    Posts
    236
    +1
    1

    1997 XP balancer shaft failure

    Okay guys, I have a question concerning the case area at the rear of the balancer shaft. I guy brought his XP in for me to look at and I found, or rather, I can feel the case is broken out where the outer race sat for the rear most bearing. the balancer shaft is stilll sitting straight in the case and can be moved easily enough. My question is as this is a less crucial area than where the case halfs meet, can that area of the case be welded and machined back to original after rebuilding the balancer shaft, rather than replace the cases.
    thanks.


  2. #2
    Tool Bag water worx's Avatar
    Join Date
    Aug 2006
    Location
    Sunny Fla
    Posts
    1,925
    +1
    66
    Used cases are cheap.

  3. #3
    WAVEATER WAVEATER's Avatar
    Join Date
    Nov 2007
    Location
    LAKE DUBAY WISCONSIN
    Posts
    236
    +1
    1
    Yea I found a set for 150. However can't I flip the motor upside down pull the bottom half case and remove the balancer shaft for rebuild, weld the case, and put it back together. That would save a ton of labor and time. I haven't dealt with a motor like this one in a few years and don't remember if you can just take it out from the bottom and not screw with the rotary valve and all the rest of it that comes with changing the top half.

  4. #4
    WAVEATER WAVEATER's Avatar
    Join Date
    Nov 2007
    Location
    LAKE DUBAY WISCONSIN
    Posts
    236
    +1
    1
    well know one is chiming in here so i guess what i will do after a couple other boat projects today is pull that motor and turn it upside down, pull the bottom case half and see if I can do the the repairs right from their, without a complete tear down. It's a good refresher course for me anyway, you would think with all the seadoos in my area that I would see more of these, but when i consider the age of the ski, I guess that I might start seeing more of these soon enough.

  5. #5
    I wouldn't even begin to consider what you are thinking. I have welded cases before, but only 951 cases that broke in the non-critical areas. When the balance shaft bearing goes on a 787, it isn't pretty, or an easy fix. Machining without totally stripping down the engine? Have you machined anything before?

    Go on eBay and pick up a set of used cases. You should be able to find a set of used cases for $100 or less; they are plentiful.

  6. #6
    WAVEATER WAVEATER's Avatar
    Join Date
    Nov 2007
    Location
    LAKE DUBAY WISCONSIN
    Posts
    236
    +1
    1
    No I haven't done any myself but I have a guy who has done an SLX 780 and an SLTX 1050 with far more serious damage to the cases in the crankshaft area on both, far more load in these areas than the counter balance area on this 951. And the break is only exactly where the outer race sat and has no cracks leading out from their. Talked to some crank specialists in Greenbay that do Alot of two stroke ski's etc. and they think the load is far less than the crank area as well, they also said the stress/load put on the cases along the balance area is not that severe as the shaft is rigid and supported equally across the shaft. I guess that's why cases are a relatively weak metal to begin with. Equally displaced torque across the engine allowing the use of light weight materials, aluminum. Will look at it inmore depth when it is actually apart. Oh yea the SLX and SLTX were done several years ago and are still running strong here on our lake. Appreciate the input, the set I found was for 150 but if you say a hundred or less I will do a little more searching. Got a set from a Greenhulk member for my SL750 for a hundred a few years ago.

  7. #7
    The 97 XP is a 787, not 951. The 951 cases shatter all the time, so they tend to be pricey for a good used set. The 787 cases don't fail very often, so they are usually pretty cheap.

    So it comes down to hours of time and questionable results, versus a cheap set of used cases. That's why I think it is foolish to even think about repairing the 787 case. Make sure you get a 97 or newer set so it has the CB shaft filler plug.

    Here's a set for $85, buy it now. Starting bid is $60. I would get a picture of the rotary valve face first before buying:

    http://cgi.ebay.com/Seadoo-787-800-e...item256569e694

  8. #8
    WAVEATER WAVEATER's Avatar
    Join Date
    Nov 2007
    Location
    LAKE DUBAY WISCONSIN
    Posts
    236
    +1
    1
    Good information thanks, and yea it is 787, the owner says 951 and I got that number stuck in my head. Anyway I will check those out and see about a pic of the rotary valve faces. I have a 1997 GSX in the graveyard and not being a seadoo guru I am wondering if those cases would be the same? their both 787's and if they do things like Polaris and Yamaha the cases should be the same year to year? And as it is a 97 it should have the filler plug you mentioned?

  9. #9
    canuck's Avatar
    Join Date
    May 2006
    Location
    The wet left coast.
    Posts
    1,088
    +1
    108
    The counterbalancer shaft on the 787 is not a sealed cavity like the 951. The manual calls for oil to be added during reassembly to lube the gears during start up after that the oil gets sucked through the rear bearings and burned. Once you pull the cases apart you will see.

    I guess my point is any 787 cases will work not just ones with a filler plug.

  10. #10
    waveater, what caused your bearing failure? and what bearing failed? Im looking into what is causing these bearing failures and seing if it can be solved using a different bearing on the side with no oil and adding oil to that cavity via an oil injection line, also same with the oil cavity with the gear adding oil to it with one of the oil injection lines. either that or creating a fill and drain and filling these periodically.

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 1997 xp pump shaft coupler/dampner
    By JBradshaw00 in forum 2-Stroke Performance
    Replies: 0
    Last Post: 08-22-2011, 01:09 PM
  2. Mew Motor For 1997 Xp
    By Stoffa17 in forum 2-Stroke Performance
    Replies: 17
    Last Post: 08-04-2007, 08:27 PM
  3. 1997 xp question!!!!!!!!!!!!!!!
    By Stoffa17 in forum 2-Stroke Performance
    Replies: 6
    Last Post: 07-30-2007, 09:43 PM
  4. F/s: 1997 Xp Hull
    By Stoffa17 in forum 2-Stroke Performance
    Replies: 3
    Last Post: 07-28-2007, 12:34 AM
  5. 1997 xp good deal?
    By punchtech in forum Sea Doo Open Discussion
    Replies: 0
    Last Post: 06-06-2007, 08:23 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
  •