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Thread: Water Leak

  1. #1

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    Good Morning,
    I have a Polaris MSX 140. I am taking on water underneath the drive shaft. Any ideas how to fix this? The water is coming in quickly and I do not know why. The hull is not cracked.

    Any input would be great!

    Thanks

    Mike


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome to the Hulk!

    Take a moment to update your Profile.

    You can download the Polaris Service Manual from here.

    How many hours does your MSX 140 have?
    2003 or 2004?

    Have you ever run the engine out of the water for more than 2 minutes at a time (on the garden hose)?
    Excessive run time on the hose can overheat the sealing lips.

    The water may be coming in via the through-hull drive shaft bearing, which has water seals around the drive shaft.

    If it is leaking, you can purchase a replacement, or have the existing bearing rebuilt.

    To check the through-hull bearing for leaks, take the metal cover over the drive shaft off. Loosen the two side bolts, remove the top bolt, and the cover can be wiggled up and off.

    If you can put it in the water (even just strapped to the trailer), you should be able to tell if the water is coming in around the drive shaft. Sometimes the seals only leak when the engine is running, or the hull is moving through the water.

    The other method is to tilt the nose up on the trailer, and put a few inches of water inside the hull, so the water just covers the drive shaft where it meets the through-hull bearing seal. Then look under the hull, through the intake grate, to see where the water is coming out.

    Again, the engine may need to be running for the seals to leak. Don't run it for more than 10 seconds or so without hooking up a garden hose for engine cooling.

    According to Battitts, the part number for the bearing assembly is 1350091, cost $25 (part 6 in the diagram). This part may be out of stock...
    Polaris has issued a rebuild kit for the MSX through-hull bearing assembly, part# 2858113

    There is also a gasket, part# 5812495, that fits between the hull and the bearing.

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    Last edited by K447; 08-18-2008 at 10:34 PM.

  3. #3

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    MSX Taking on water

    Thanks for the quick reply,

    It is a 2003 MSX with 124 hours on the engine.

    As soon as you put the machine in the water, it starts taking on water, it does not have to be running. I have taken off the drive shaft cover. You can feel the water coming in from the floor of the hull under the drive shaft, is there suppose to be some kind of seal there?

    Thanks

    Mike

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ladon View Post
    ...As soon as you put the machine in the water, it starts taking on water, it does not have to be running.
    I have taken off the drive shaft cover. You can feel the water coming in from the floor of the hull under the drive shaft, is there suppose to be some kind of seal there?
    The through-hull bearing mounts to a sloped metal casting, that is bonded to the hull. Either the through-hull bearing is not sealed to the casting, or the bonding of the casting to the hull has failed.

    Have the bolts holding the through-hull bearing to the hull become loose? There is a seal between the two (part 13 in the posted diagram).

    Can you get a mirror, or a digital camera down there, to see exactly where the water is coming in?

    I suppose it is possible for the hull to have become cracked. Have you examined the bottom of the hull, especially around the front of the ride plate, and the intake grate?

    The intake grate can be removed easily, only one bolt at the front end holds it in place. You may need to remove the grate to fully inspect the area. Also check the mounting boss for the intake grate bolt. It could have developed cracks.

  5. #5

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    Water Leak

    Thanks K447,

    I tightened everything up and took it back to the launch ramp.

    I left off the drive shaft cover. You were 100% correct. The water is coming in thru the bearing assembly.

    OK this may be a dumb question, but do you have to take the impeller off to replace this bearing? It is one thing to simply remove the bolts that attach this bearing to the hull, but that would be the easy part.

    Again thanks for your help.

    Mike

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ladon View Post
    ...do you have to take the impeller off to replace this bearing?
    It is one thing to simply remove the bolts that attach this bearing to the hull, but that would be the easy part...
    Yes, you need to remove the jet pump, and then pull the drive shaft out.

    Review the procedures in the 2003 MSX 140 Service Manual, page 142.

    The MSX 140 drive shaft is different from all the non-MSX drive shafts, as you need to disconnect the coupler from the drive shaft before you can pull the shaft out.

  7. #7
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    When replacing the seals or assembly take note.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  8. #8

    Same Exact Problem

    I have this same exact problem. But I cannot find the part #2858113 anywhere. It is on back order with Polaris and no one has it.

    If anyone has these parts let me know and I will pay.

    I would even just be happy with the seals:

    3610040
    5812495
    5133826

    Thanks!!

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by cschron View Post
    I have this same exact problem. But I cannot find the part #2858113 anywhere. It is on back order with Polaris and no one has it.

    If anyone has these parts let me know and I will pay.

    I would even just be happy with the seals:

    3610040
    5812495
    5133826

    Thanks!!
    This might help;
    Jet Pump Maintenance and Service

    And this web page;

    Sealed MSX through-hull driveshaft bearing assembly
    How to check for leaks at the MSX through-hull bearing
    Recommended replacement/rebuild of MSX through-hull seals is every 100 hours or 3 years (especially in salt water)
    How to remove the MSX drive shat
    How to remove and replace the MSX seals and bearing
    Generic replacement bearing is a 6205.
    The inner seal is 25 x 52 x 10 (substituted with generic 25x52x7)
    The two outer seals are 25x35x10 (substituted with generic 25x35x7)

  10. #10
    Thanks a ton for your post.

    Since it is out of stock everywhere i think my best bet will be buying the parts. Are they any special requirements? Would the bearing and seals below work?


    Generic replacement bearing is a 6205.
    http://www.thebigbearingstore.com/se...al-Ball/Detail

    The inner seal is 25 x 52 x 10 (substituted with generic 25x52x7)
    http://www.amazon.com/National-25X52.../dp/B000MNC79W

    The two outer seals are 25x35x10 (substituted with generic 25x35x7)

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