Hey Guys, we got a 96’ Monte Carlo 900 earlier this spring and it ran great for a few days. It then started cavitating when beginning to accelerate. I figured out the floating drive shaft bearing seal was allowing water to leak into the hull. I assumed this was sucking air from the hull and causing the cavitation problem.
I replaced the entire floating bearing assembly, including all the seals. This seemed to work, and the machine ran great for 4-5 hours, no issues, no cavitating. Then I started to notice the ski cavitating again so I checked the seal and found water slowly leaking in (like before). It seemed to slow the leak when I pressed down on the assembly. This helped the cavitating slightly but still not correct.
Notes: As I reassembled everything I double checked the impeller, wear ring and stator and they were all within manual requirements. I didn’t notice any obvious wear or burrs on the drive shaft either. I also greased the assembly well.
On the water, I loosened the hose clamps and straightened everything to make sure it was in line but that didn’t cause any changes. I also regreased the assembly and it didn’t seem to help.
Are there any ideas or suggestions as to why the new seal is leaking already? Is there something I can do different or something I did wrong to cause the problems? The cavitation is the real issue, the bilge pump works fine so I’m not real concerned about the water issue, but I know it’s not correct.
Any thoughts or ideas?
I replaced the entire floating bearing assembly, including all the seals. This seemed to work, and the machine ran great for 4-5 hours, no issues, no cavitating. Then I started to notice the ski cavitating again so I checked the seal and found water slowly leaking in (like before). It seemed to slow the leak when I pressed down on the assembly. This helped the cavitating slightly but still not correct.
Notes: As I reassembled everything I double checked the impeller, wear ring and stator and they were all within manual requirements. I didn’t notice any obvious wear or burrs on the drive shaft either. I also greased the assembly well.
On the water, I loosened the hose clamps and straightened everything to make sure it was in line but that didn’t cause any changes. I also regreased the assembly and it didn’t seem to help.
Are there any ideas or suggestions as to why the new seal is leaking already? Is there something I can do different or something I did wrong to cause the problems? The cavitation is the real issue, the bilge pump works fine so I’m not real concerned about the water issue, but I know it’s not correct.
Any thoughts or ideas?
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