Impeller sizing and repair questions!!
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Impeller sizing and repair questions!!

  1. #1
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    Default Impeller sizing and repair questions!!

    Well I started taking my pump apart tonight which is insanely easy since these things are so simple. I took a few pics. The leading edges on the intake side are rounded and beat up but the back side of the impeller looks pretty good from what I can see. What is the proper way to clean up the impeller? Do you only smooth it up and grind from the top side without touching the bottom side of the edge? Here is what the impeller looks like on both sides and also some pics of the stator which looks a bit beat up also. Let me know what you guys think. It looks like it is a B impeller and says aggressor mb401 on it....which doesn't mean a lot to me maybe someone can chime in....its an 18 ft baja with a 402 bbc near stock, with this je pump and has a place diverter, turns 4600 rpm and does only 45-49 mph depending on how many ppl are in it which seems a little slow to me...according to the impeller chart its making 300ish hp. Is this the right size impeller for the boat? and would a loader thats set up right help my boat out any?

    Here is the intake side.... I need a bigger wrench to get the impeller nut off so this is the best I could get of this side so far but it looks like it should be fixable
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    Here is the backside of the impellar, it has nice crisp edges
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    Here is the inside of the bowl.... does this stator look ok or is there anything to do to clean it up a bit?
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    I am going out of town for the weekend and I will get a wrench to fit the nut to get it off and I am getting a larger diameter caliper to measure the impeller and wear ring to check clearance, just by moving the shaft by hand it seems like its a little sloppy and not in tolerance which could most certainly be adding to the problem. Ohh and some more info... when u floor it the nose likes to come up and just doesn't seem to get on plane real quick at all even with the diverter trimmed all the way down to start.



    Sorry for all the questions but I'm new to these jets and any help or suggestions are appreciated! thanks in advance

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    Anyone sharpen the impeller blades? Curious on how to do it properly.

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by 84lsvette View Post
    Anyone sharpen the impeller blades? Curious on how to do it properly.
    You can dress them up yourself...you don't want a shaving edge on the impeller, as that won't hold the edge very long...more like a butter-knife edge, somewhat rounded.
    Also dress up the entrance veins on the bowl with a file > only work on the back-side > you'll see where to do it.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Well there's no doubt I have found a lot of the problem......I check the tach with another one hooked up and it reads spot on....So i got the impeller out and here are the measurements I found

    In pictures

    impeller sizing-7.218 was the norm...this was a little smaller spot.
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    Wear ring-really bad 7.36
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    Beat impeller blades
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    You can see the wear in the ring
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    Well that's it for tonight...figured I'd post my findings since they are most certainly interesting.
    Jeff at jetperformance thought it was weird the wear ring was so worn but the impeller was close to being in tolerance.....but who knows what the PO did to it before I bought it because all the seals and grease and bushing in the end of the bowl look like they were just replaced.... maybe put a new seals impeller and all but overlooked the wear ring? ya never know but at least I found a lot of the problem

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    Since the Impeller is barely undersized and I can fix the blades up, the seals and bearing are all good on the unit and look like they have been replaced recently it should be fine to just get an undersized wear ring to fit my impeller shouldn't it? The .010 undersized would make the clearance .022 which would be right in spec. Do you want to hang around .024 clearance or do you want to go a little tighter? I would like to get this thing ordered today so I can get this boat back in the water. Thanks

  8. #6
    AKA OhOneWS6 Last Mohican's Avatar
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    That impeller looks a little beat up on the exit side to me. I see what looks a lot like cavitation burn. You might be surprised what a nice new impeller & wear ring and good tight pump will do for you. I'm certainly no expert so hopefully some other will chime in. If not give Tom @ JBP a call.

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    Large Member edog's Avatar
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    Are there shims on the shaft? I think you need to check the clearance on the front face of the impeller and the wear ring shoulder also.

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    There were no shims at all on the shaft. I was debating on getting a new impeller also since yes this one does look a little old. Which I might as well get the Berkeley rebuild kit since its about $470 bux with impeller and the impeller alone is $330 plus $150 wear ring. I would imagine once I get it all tightened up it should act like a whole new boat.

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    AKA OhOneWS6 Last Mohican's Avatar
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    Might be worth checking a couple of the board sponsors for a rebuild kit.

    Jet Boat Performance, Rebuild Kits

  12. #10
    Large Member edog's Avatar
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    Quote Originally Posted by 84lsvette View Post
    There were no shims at all on the shaft. I was debating on getting a new impeller also since yes this one does look a little old. Which I might as well get the Berkeley rebuild kit since its about $470 bux with impeller and the impeller alone is $330 plus $150 wear ring. I would imagine once I get it all tightened up it should act like a whole new boat.
    I wasn't sure about the shims, but the picture on post #4 where you are showing the wear ring. it looks like there was something on the shaft. it might just be my old blurry eyes.

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    It might have that 1 small shim on it still on the shaft. I didn't take anything else off of the shaft except the impeller. I have been trying to get ahold of tom at Jet boat performance but he is a pretty busy guy.

  14. #12
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    a good b impeller is a good size for the power you have.

    since it sounds like you're going to try and fix this, you should also remove the shaft and have it checked for straightness. when the shaft is a little eccentric, it will cause the impeller to make the shoulder/wear ring clearance a little larger (or a lot larger) than it should be. if it's not too bad, it can be welded and re-machined. if it's way out, it needs to be replaced or you'll go through this again in short order. this isn't uncommon...

    the impeller shows definate signs of cavitation. but it doesn't look like anything that can't be corrected/cleaned up by a pro for a lot less than $470. if you can afford it, you would be better off having someone clean it up that knows what they are doing, and accurately check all the dimensions. not just the diameter, but how true it is to center.

    don't want to get everybody all butt hurt, but this is just a fact. there are impellers of that brand that are ok, and then others that are plain crap that should have been melted. there have been instances where, right out of the box with the smallest wear ring known to man, the clearance still exceeded .050. then there are other examples where they were just fine and ran well for years.

    for what you're doing, the bowl is ok. leading edges of the volutes should be cleaned up an bit. having them rounded does nothing to improve flow. they should be straight and sharp. not necessarily razor, but not rolled over either.

    you have gone this far, and already saved money by taking it apart (shop time is money). i would spend a few bucks to have someone check these things, repair/replace as necessary, or you'll end up going through this excercise again.
    Last edited by bp298; 07-17-2012 at 10:50 AM.

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    Thanks for the response that is some more info I have been looking for. There is a guy 45 min south of me that rebuilds jet drives and did one for a friend that turned out great maybe I will give him a call. Apparently the B aggressor impeller is similar to a standard A impeller. Which should be just fine because by next year it will be making more power
    Last edited by 84lsvette; 07-17-2012 at 11:41 AM.

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    Talked to tom at performance jet and he's got me all squared away! Hopefully it wakes this baby up as much as I think its going to!

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