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MR1 experts 04 SX230 intermittent grinding sound in the port side engine

SRSx3

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2003
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SR
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Hello jetboaters, MR 1 experts I noticed a very sharp grinding sound on port side of my engine, sound like a bearing but intermittent upon turning on the engine and when the water hose is on, sounds gradually disappear and gone. I'm not sure what is this sound, I just change oil, check compression, new spark plugs 2 months ago and engine is barely used 3 times only salt water though and flush after used. I'm not sure if the sound is from the intermediate bearing or power pump in the impeller itself, RPM doesn't fluctuates stays within 2,000 rpm normally. Would like to hear your opinion MR 1 experts. I'm pretty mechanical in nature, I can check whatever is your recommendation I have the complete manual but troubleshooting is more difficult to do with this engine since manual doesn't state the problem. TIA.
 

dgfreeze

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You might consider removing the pump assembly and shaft. It would eliminate the possibility of the intermediate bearings and clearance issues with the impeller/housing. If it's still making noises, you know it's the engine, if it stops, you know it's something behind the engine. Not difficult to do, takes 15-20 minutes...
 

ripler

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If you are running on the hose, you will get a rattling sound from the pumps.
 

Drift Away

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If it sounds like a 2 stroke dirt bike its the pump housing.

 

Beachbummer

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It's probably your pump bearings. My boat was doing something similar and it improved tremendously after I replaced the pump bearings.
 

SRSx3

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It's probably your pump bearings. My boat was doing something similar and it improved tremendously after I replaced the pump bearings.
Thank you definitely that's what I'm thinking but i'm going to isolate the problem by removing the pump per dgfreeze... I'll keep you udpated.
 

Beachbummer

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Yes, Good idea and good course of action. need to remove pump as was suggested to find out for certain.
 

SRSx3

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Update: I remove the pump and exactly on the video that I find out, it's the pump housing needs to be replaced due to impeller is hitting on it, just like the video, I try the solas impeller housing but can't find it how to order the right one, I just order the Yamaha OEM from boats.net. Bearing are all working very well.
 

Scottintexas

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So you pulled the cone off the impeller and the bearing showed no sign of water intrusion?
 
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