noise in rear when i turn port and starboard

Discussion in 'Sterndrives' started by kenrahe, Jun 28, 2012.

  1. kenrahe
    Joined: Apr 2010
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    Location: pomfret ct

    kenrahe Sunseeker

    Had new gimbal bering put in last year by a marina and this year i'm getting a noise when i turn port and starboard could this be the universal joint....or could it be the housing pins
     
  2. whitepointer23

    whitepointer23 Previous Member

    sounds like the universal joint.
     
  3. CDK
    Joined: Aug 2007
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    CDK retired engineer

    The bearing may have gone again, one of the thin O-rings may have pushed out or the U-joint has bearing damage. There probably still is some water intrusion through a bellows or the shift mechanism.
     
  4. kenrahe
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    kenrahe Sunseeker

    Are You Talking About The O Rings At The Front Of Driveshaft
     
  5. kenrahe
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    kenrahe Sunseeker

    Found no holes or tears in bellows
     
  6. kenrahe
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    kenrahe Sunseeker

    bearing is less than one year old
     
  7. kenrahe
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    kenrahe Sunseeker

    Hey cdk took off outdrive bellows gimbal and exhaust all in great shape but i found a melted flapper valve stuck up against the shifter shaft in front of the exhaust bellows would that have caused the tapping noise and bogging down....
     
  8. CDK
    Joined: Aug 2007
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    CDK retired engineer

    The drive shaft has two thin O-rings to take up the play between the shaft and the bearing inner diameter. When the shaft is pushed in after bearing replacement and no alignment tool was used, the rings can get damaged or pushed from their grooves.

    As for the bellows, if you can see a hole or tear they are really old. More often there is some dirt or corrosion between the rubber and the alloy where water can seep in and ruin the gimbal bearing.

    In the Alpha-1 2nd generation, Mercruiser changed the construction on the gimbal side. Bellows replacement is less easy than the old one because a special tool is required. The drive side still only has a clamp around the bellows, but Merc advises to use their special bellows glue to make sure it is water tight.
     
  9. kenrahe
    Joined: Apr 2010
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    Location: pomfret ct

    kenrahe Sunseeker

    Hey cdk took off outdrive bellows gimbal and exhaust all in great shape but i found a melted flapper valve stuck up against the shifter shaft in front of the exhaust bellows would that have caused the tapping noise and bogging down....and the o-rings are fine of course i'm putting new ones in when i reassembal.......
     
  10. CDK
    Joined: Aug 2007
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    CDK retired engineer

    That doesn't ring any bell; I've never seen a flapper valve on a stern drive, melted or not.
    A picture might clear things up!
     
  11. whitepointer23

    whitepointer23 Previous Member

    this has been mentioned on the forum before. people have thought it was the engine rattling and found it was the exhaust flap in mercruisers.
     
  12. kenrahe
    Joined: Apr 2010
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    kenrahe Sunseeker

    sorry i guess i called it wrong it's the water shutter in both sides of the y pipe
     
  13. kenrahe
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    kenrahe Sunseeker

    and is this really nessecery for normal operation
     
  14. kenrahe
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    kenrahe Sunseeker

    what would happen if i left them out
     

  15. 7228sedan
    Joined: Nov 2009
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    7228sedan Senior Member

    pretty sure they're there to prevent water back flow up the exhaust in the event of a panic (sudden) closing of the throttle. Similar to thru hull exhaust flappers. I'd assume that the likelihood of this happening an a typical stern drive set up is less likely than on a thru hull set up. However they are in there for a reason...
     
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