Thread: PTO not looking so good
08-19-2008, 08:22 PM #1
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.
08-19-2008, 08:26 PM #2
08-19-2008, 08:28 PM #3
08-19-2008, 08:36 PM #4
that is so clean i would have to say you forgot to tighten down teh head bolts. ( ie haven't finished the install)
08-19-2008, 09:27 PM #5
08-19-2008, 09:34 PM #6
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??
08-19-2008, 09:46 PM #7
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?
08-19-2008, 09:58 PM #8
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??
08-19-2008, 10:02 PM #9
Are those bearings pressed onto the crank or are they replaceable?
08-19-2008, 10:06 PM #10
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?
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