Jet pump Humm

[toughwaters]

Hey guys.
Last year I purchased a used 2001 Seadoo GTX DI with the 951 in it. Mid season I decided to have the the jet pump oil changed so I took it to my local seadoo dealer and they said that water had gotten into the pump cone and the pump needed to be rebuilt. So I had them rebuild it and I took it down to the lake for a test run. It ran fine for about 20 minutes then the pump started to make a loud humming sound especially while ideling and at low speeds. The ski seemed to handle fine and I did not notice any loss of performance whatsoever. I ran it for the rest of the day and the humming seemed to come and go. I took it back to seadoo and they "SAID" the looked at it and couldnt find anything wrong and they couldnt hear the noise. One of my buddies thinks that they may have installed the bearings in backwards. So I took the ski out a week later and the hum would still come and go. So my question is are these jet pumps supposed to sound like this? Or is there something wrong. Im heading down to Lake Powell for a week and dont want this thing to go out on me. Thanks for the help.

 

[Rob454]

Re: Jet pump Humm

Is the humming in or out of the water. the pumps shouldnt hum. some of the older ones rattled but that was normal ( out of water) . make sure the oil level is where it needs to be. those pumps require gear oil in the pump cone/center. bearing area. make sure you go back to the dealer and you get the complaint in writing. this way youll have a leg to stand on

 

[toughwaters]

Re: Jet pump Humm

Yeah it happens in the water and not out. And sometimes its loud and at other times you can barely hear it. I know of the rattle that your referring to and its defenately not a rattle. More of a "mmmmmmmmmmm" sound that gets loud as you accelerate. Maybe its normal for a seadoo to sound this way. I dont know.

 

[JUSTINTIME]

Re: Jet pump Humm

take it back and make them fix it