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  1. #1
    aksor's Avatar
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    Polaris SL 750 PTO engine coupler very hot

    Hi

    I have purchased a 94 SL750 that was burned down after the previous owner decided that smoking while fixing a fuel leak was a good idea.

    All of the fuel hoses and wiring including the oil hoses where all burned and melted.

    I ended up replacing all of the wiring and oil and fuel hoses, Upgraded the fuel pump to a triple, cleaned the carbs, replaced the diaphragms as they where dried out. checked the oil injection works fine.

    She starts up and runs pretty good, I did have in water last weekend but that's when I found two issues: first the water box was extremely hot so I cleaned out the water injector filter it was clogged up with debris, second the PTO end coupler was hot enough to sizzle water, found out by mistake when I was spraying water on the water box.

    So I figure that the PTO bearings are pretty much shot to cause so much heat.

    So here is my options: Sell it while it still runs! Fix it by replacing the crank.

    Any ideas.

    Thanks


  2. #2
    Click avatar for tech links/info K447's Avatar
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    Welcome.

    Did the fire burn the rear crank seals on the engine?

    Is the engine actually running properly on all three cylinders?

    If you sell it as it, the honorable stance would be to disclose the potential engine issue to the buyer.

  3. #3
    aksor's Avatar
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    The fire did not damage the rear seal but I did split the case and I replaced all 3 crank seals because the magneto seal was leaking oil.
    I'd rather keep the watercraft as I have a few $$ invested in it.

    I'm just wondering what could cause all the heat there must be one of the PTO bearings going to cause so much heat.

    The thing is even after riding it for 30 minutes it will start up no problem.

    I have an infrared thermometer and did check the casing around the bearing after running it on the hose for about 7-10 minutes and it's cool to the touch measuring about 38-40 degrees C. while the PTO shaft is 70 C.

    All 3 cylinders are running checked cyl head with thermometer and they are all firing.

    I removed the spark plugs and the crank spins freely without any binding.

    I was thinking the oil injection but it would of seized a piston by now.

    I'm stumped. I might just ride it till I lock up the motor

  4. #4
    Click avatar for tech links/info K447's Avatar
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    Is the heat coming from the through-hull bearing?

    If you split the case again then you could change the rear crank bearings, no?

  5. #5
    aksor's Avatar
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    No the heat is comming from the engine side.

    Just talked to John Ziegler and he did mention that the coupler does get quite hot while under load and the crank does get hot.

    he told me to just drive it and if it decides to go its an easy bearing replacement with a 6307NR C4.

    So we shall see what happens.

  6. #6
    aksor's Avatar
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    Update ripped the engine out and split it apart, found the crank bearings are shot and the pto piston was scored on the intake and exhaust side.

    I also found some rust on the bearing.

  7. #7
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by aksor View Post
    ... I did split the case and I replaced all 3 crank seals ...
    Quote Originally Posted by aksor View Post
    Update, ripped the engine out and split it apart, found the crank bearings are shot and the pto piston was scored on the intake and exhaust side.

    I also found some rust on the bearing.
    When you split the case the first time the bearings were OK?

    At this point I would be suspecting the crank needs to be rebuilt. If the PTO connecting rod bearing has any excess play or signs of grittiness or rust, that would be the sure sign. Or any of the other main bearings...

  8. #8
    aksor's Avatar
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    i should of known better when I found water in the crankcase after I bought it. live and learn.

  9. #9
    aksor's Avatar
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    the center bearingg are noisy as hell and they all have play in them so I either buy another used crank or have that one rebuilt.Any reputable shops in ontario or Quebec?

  10. #10
    aksor's Avatar
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    I found an old timer in Bristol Quebec who rebuilds cranks, his shop is called the Crank Shop and he has been rebuilding cranks for ages, used to race snowmobiles in the past.

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