Results 1 to 10 of 10
  1. #1
    1996 SL900 & SL700 turk0004's Avatar
    Join Date
    Jul 2007
    Location
    Chicago IL
    Posts
    328

    PTO not looking so good

    Hi guys. I decided to pull the spark plugs today to take a peek at the wash on my SL900 that has about 4 hours on new engine. The Mag and Cen pistons are beginning to get a little wash on them but saw no wash on the PTO. When I looked a little closer I saw a really rough surface on the PTO piston while the other two looked good and a little wet. I pulled the head and snapped some pics. It almost looks as if something was in the cylinder for some time. The piston has little dimples in it (see pics). I was snapping some pics of the head which looks good to me and noticed that a bunch of the spark plug threads were missing and was wondering what you guys thought of this situation.

    Thanks

    Turk
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_0073.JPG 
Views:	32 
Size:	466.5 KB 
ID:	89712   Click image for larger version. 

Name:	IMG_0074.JPG 
Views:	32 
Size:	394.7 KB 
ID:	89713   Click image for larger version. 

Name:	IMG_0075.JPG 
Views:	30 
Size:	393.3 KB 
ID:	89714   Click image for larger version. 

Name:	IMG_0076.JPG 
Views:	31 
Size:	341.9 KB 
ID:	89715   Click image for larger version. 

Name:	IMG_0077.JPG 
Views:	25 
Size:	397.9 KB 
ID:	89716   Click image for larger version. 

Name:	IMG_0078.JPG 
Views:	30 
Size:	389.1 KB 
ID:	89717  

    Click image for larger version. 

Name:	IMG_0079.JPG 
Views:	28 
Size:	371.0 KB 
ID:	89718  


  2. #2
    ph2ocraft's Avatar
    Join Date
    Apr 2006
    Location
    Campbell, Ca.
    Posts
    14,100
    +1
    105
    By new, do you mean new crank as well?

  3. #3
    1996 SL900 & SL700 turk0004's Avatar
    Join Date
    Jul 2007
    Location
    Chicago IL
    Posts
    328
    Yep.

  4. #4
    seaobin's Avatar
    Join Date
    Jun 2007
    Location
    Raleigh, North Carolina, United States
    Posts
    1,573
    +1
    1
    that is so clean i would have to say you forgot to tighten down teh head bolts. ( ie haven't finished the install)

  5. #5
    1996 SL900 & SL700 turk0004's Avatar
    Join Date
    Jul 2007
    Location
    Chicago IL
    Posts
    328
    those bolts were pretty tight.

  6. #6
    ph2ocraft's Avatar
    Join Date
    Apr 2006
    Location
    Campbell, Ca.
    Posts
    14,100
    +1
    105
    The reason I ask is it appears like early signs of the crank bearing cage coming apart. It could be something else but that's the first thing that came to mind when I saw your photo's.
    I also notice quite a bit of rust around the one dome and wonder if you were ingesting water which would also explain why there is no read on the piston.

    The domes just seem like more than 10 hours use to me, were they new and purty when you started as well??

  7. #7
    1996 SL900 & SL700 turk0004's Avatar
    Join Date
    Jul 2007
    Location
    Chicago IL
    Posts
    328
    History on this motor is I bought with rebuilt motor. The only parts that were reused were the head covers, heads and cylinders (bored .25 over). They replaced the pistons, rods and crank (SBT). I am not sure if any of the crank bearings were replaced.

    A few weeks ago, brother in law had to tow the ski to the dock and hydrolocked the motor. You and a few others helped me get that water out and this weekend put about 2 hours on it and it ran really good. Sounds like that water may have done something to the crank bearings?

  8. #8
    ph2ocraft's Avatar
    Join Date
    Apr 2006
    Location
    Campbell, Ca.
    Posts
    14,100
    +1
    105
    Sadly enough I'll bet that's it. I've had cranks under water before and they do all right but it needs to be oiled right away. SBT is not known for using quality bearings but maybe they'll warranty it??

  9. #9
    1996 SL900 & SL700 turk0004's Avatar
    Join Date
    Jul 2007
    Location
    Chicago IL
    Posts
    328
    Are those bearings pressed onto the crank or are they replaceable?

  10. #10
    ph2ocraft's Avatar
    Join Date
    Apr 2006
    Location
    Campbell, Ca.
    Posts
    14,100
    +1
    105
    All Polaris cranks are pressed together, you'll have to remove the engine, split the cases and have the crank checked.

    Can you feel upward/downward play at the rod?
    Do you see signs of rust on the crank?

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. maiden voyage not so good
    By badfish88 in forum Yamaha Open Discussion
    Replies: 5
    Last Post: 04-22-2010, 12:15 AM
  2. Compresion check.....not so good
    By patrick webb in forum Yamaha Open Discussion
    Replies: 10
    Last Post: 07-29-2009, 09:04 AM
  3. PSI 750: some good and some not so good
    By xlint89 in forum Polaris PWC Performance
    Replies: 17
    Last Post: 02-01-2008, 12:04 AM
  4. Project: Make it not quite so hot.
    By javiert99 in forum Polaris PWC Performance
    Replies: 56
    Last Post: 09-06-2006, 07:24 AM
  5. "Fishing was so good, they were jumping in the boat! &
    By Pistonwash in forum Yamaha Open Discussion
    Replies: 5
    Last Post: 01-12-2006, 12:03 PM

Posting Permissions

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