SoCal Jet Boats
Tech Talk => Jet Pumps => Topic started by: jrado on March 21, 2012, 08:18:45 PM
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ok, so i have a berkeley 12 jc pump and today after giving the boat a once over before taking it out, i noticed that my pump is making a knocking sound. I pinpointed the knock coming from the suction unit of the pump and can feel vibration when i put my hand on it.
any ideas what it could be?
anyone know of a good place to take it to be worked on?
Thanks!
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Had #8 piston let go sounded like it was in the pump.
U-joints? front bearing? unhook the driveline and see if it goes away.
Daniel
Mash on it
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Pumps need water, don't they?
Sent from my ADR6400L using Tapatalk
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I'm assuming you heard it at idle which is a fairly normal condition when the splines have worn a bit. Check your u-joints to rule them out as the cause. If all is good then run it.
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I had a flywheel coming loose once and it sounded like it was in the pump.
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X's 2 on the drive line as roost said , "machine noise" (stacato grumbling/rattling) is common in jets at low rpm/speeds and particularly running out of the water with no load on the impeller (not recommneded BTW) , this is also made worse by heavy impellers like stainless and bronze , things like "lumpy cams" and wear in between the male and female splines at the jet input can also aggravate the issues.Unless it worsens , vibrates when running or makes noise above idle (in the water) its not likley a problem beyond the annoyance Tom
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anyone know of a good place to take it to be worked on?
Thanks!
there is tom at jet boat performance, who has already replied to this thread