Berkeley Pump Rebuild - need help diagnosing problem
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Berkeley Pump Rebuild - need help diagnosing problem

  1. #1
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    Default Berkeley Pump Rebuild - need help diagnosing problem

    Alright guys, I need some help here.


    454BBC (passenger/2 bolt/ ~325HP).
    Berkeley JC pump.


    WOT - 4900 RPM & 46 MPH - Sea level with 4 adults
    WOT - 5100 RPM & 50.6MPH - 3700' elevation - 1 adult.


    Pulling a skier, the pump cavitates and doesn't produce much torque.


    Based on the above the assumption has been that the impeller was a C cut, which was causing the high RPMs and cavitation from a stop under load. I was getting ready to send the pump out to get rebuilt with a new impeller so I pulled it apart and this is what I found inside. A2 cut impeller, what looks to me like clean leading edges, no obvious issues. So what gives? Why are my RPMs so high and having trouble with the holeshot?


    Now I have no clue what to do with the pump rebuild. I'm glad I might save some money on not needing a new impeller, but at a loss for performance issues.

    https://imgur.com/i3e17Eg

    https://imgur.com/zIF5Xy9


    https://imgur.com/RPWymEK


    https://imgur.com/jfIJt1e

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  3. #2
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    Quote Originally Posted by 71BeaterBoat View Post
    Alright guys, I need some help here.


    454BBC (passenger/2 bolt/ ~325HP).
    Berkeley JC pump.


    WOT - 4900 RPM & 46 MPH - Sea level with 4 adults
    WOT - 5100 RPM & 50.6MPH - 3700' elevation - 1 adult.


    Pulling a skier, the pump cavitates and doesn't produce much torque.


    Based on the above the assumption has been that the impeller was a C cut, which was causing the high RPMs and cavitation from a stop under load. I was getting ready to send the pump out to get rebuilt with a new impeller so I pulled it apart and this is what I found inside. A2 cut impeller, what looks to me like clean leading edges, no obvious issues. So what gives? Why are my RPMs so high and having trouble with the holeshot?


    Now I have no clue what to do with the pump rebuild. I'm glad I might save some money on not needing a new impeller, but at a loss for performance issues.

    https://imgur.com/i3e17Eg

    https://imgur.com/zIF5Xy9


    https://imgur.com/RPWymEK


    https://imgur.com/jfIJt1e
    Berkeley Jet Drive - Inducer Pre-Impeller Cavitation Reducer
    these work.
    Slinging Lead on and off the water for over 40 YRS

    82 18' Crusader Tunnel SOLD ,
    00 23' Mako 232 fish killer,SOLD
    78 19' Eliminator Daytona SOLD
    16 19' Predator/Cheyenne

  4. #3
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    Quote Originally Posted by leadslinger View Post
    Thanks for the link. I’ve thought about using those. But a little more backstory, the boat cruised and maxed out at lower rpms before the last rebuild and impeller swap. After the last rebuild it lost pulling power with a skier and the rpm increased.


    Sent from my iPhone using Tapatalk

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    have you checked the wear ring clearance or is you intake grate damaged?

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    have you checked the wear ring clearance or is you intake grate damaged?

    Rope seal leaking air?

  8. #6
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    Quote Originally Posted by SS496 View Post
    have you checked the wear ring clearance or is you intake grate damaged?

    Rope seal leaking air?
    I don't have anything to check the clearances on the wear ring, but the intake grate isn't damaged. It's in good shape.

  9. #7
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    Quote Originally Posted by 71BeaterBoat View Post
    I don't have anything to check the clearances on the wear ring, but the intake grate isn't damaged. It's in good shape.
    impeller looks a little sand blasted to me...bet wear ring is an issue.

  10. #8
    Senior Member ol guy's Avatar
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    Pull the hand hole cover and turn it 180 degrees and look again. I mean spin the engine 180 degrees
    Last edited by ol guy; 02-26-2019 at 07:33 PM.

  11. #9
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    WOT - 4900 RPM & 46 MPH - Sea level with 4 adults..... Your numbers are not that far off 325 HP with a AA Berkeley impeller would be around 4500 (assuming your tach is accurate ) the "tire spin" as I percieve it Is likley wear and tear causing excess clearance between impeller and wear ring and thus cavitation which feels like "slippage" , possibly some air leakage from worn or burnished packing , leaking clean out cover etc along with it Honestly sound like its simply time to "freshen" your jet I failed to see what Hull or what length but suspect its a full grown cruiser? If so your speed may not be far off If its a low slung 18 ft boat thats a different story Tom

  12. #10
    Senior Member ol guy's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    WOT - 4900 RPM & 46 MPH - Sea level with 4 adults..... Your numbers are not that far off 325 HP with a AA Berkeley impeller would be around 4500 (assuming your tach is accurate ) the "tire spin" as I percieve it Is likley wear and tear causing excess clearance between impeller and wear ring and thus cavitation which feels like "slippage" , possibly some air leakage from worn or burnished packing , leaking clean out cover etc along with it Honestly sound like its simply time to "freshen" your jet I failed to see what Hull or what length but suspect its a full grown cruiser? If so your speed may not be far off If its a low slung 18 ft boat thats a different story Tom
    I agree Jim, he has not mentioned hull other than 2 seater? I just noticed the hand-hole(clean-out) the boat deffinetly shows cavitation. M

  13. #11
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    Quote Originally Posted by jetboatperformance View Post
    WOT - 4900 RPM & 46 MPH - Sea level with 4 adults..... Your numbers are not that far off 325 HP with a AA Berkeley impeller would be around 4500 (assuming your tach is accurate ) the "tire spin" as I percieve it Is likley wear and tear causing excess clearance between impeller and wear ring and thus cavitation which feels like "slippage" , possibly some air leakage from worn or burnished packing , leaking clean out cover etc along with it Honestly sound like its simply time to "freshen" your jet I failed to see what Hull or what length but suspect its a full grown cruiser? If so your speed may not be far off If its a low slung 18 ft boat thats a different story Tom
    The hull is a 19’ Tahiti with a deep v Hull.


    Sent from my iPhone using Tapatalk

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    I've decided to go with a full rebuild by Tim @ Place Diverters and start with a heritage AA impeller. After I get the pump and get it back in the boat I'll take the boat out and see how she does. I'll repost the number that I see after I get it back out on the water.

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    Senior Member bp298's Avatar
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    Quote Originally Posted by 71BeaterBoat View Post
    I've decided to go with a full rebuild by Tim @ Place Diverters and start with a heritage AA impeller. After I get the pump and get it back in the boat I'll take the boat out and see how she does. I'll repost the number that I see after I get it back out on the water.
    not a fan of that impeller nut you have. made in china, and not all of them were square. well, most of them weren't square. so, the nut gets torqued on and it cocks the impeller to one side. impeller rubs, and it only gets worse. "self clearances" the wear ring outside the desired tolerance. pump should spin smoothly when it's back together with clearances to spec, no rubbing...

  16. #14
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    Got the boat back in the water today after re-installing the rebuilt pump and redoing the interior over the last couple of months.

    Lake Perris: 2 adults 2 kids.

    WOT: 4800 rpm @ 48.5mph.
    Heritage AA impeller and rebuild by Tim @ Place Diverters. Boat runs strong from the hole, and I'm happy with the performance I was seeing today.

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