Does berkely pump need repair - what should pump pressure be?
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Does berkely pump need repair - what should pump pressure be?

  1. #1
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    Question Does berkely pump need repair - what should pump pressure be?

    I have a new to me jc-a pump with I believe a aa impeler. Engine is stock mercrusier 454 with 330 hp. gps speed 46 mph
    boat is 22 ft 12 degree harbercraft.
    pump pressure was 60 lbs messured inches from engine cooling tap.
    engine rpm showing 5400 rpm.
    alomst no pump pressure till 2500 rpm.
    is this normal, or is their too much clearance between impellar and wear ring.
    definitely a newbie river boater.

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  3. #2
    Menominee, mi UP
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    you will not make muck pressure till 2500-3000,thats when the pump starts to work, and dont think it has an aa running 5400 with 330 hp

  4. #3
    I'm No Expert Shaun's Avatar
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    pretty sure with that hp you shouldn't be able to spin that AA to 5400 RPM. Whens the last time it was rebuilt with a new wear ring? You should see some pressure at 2500 RPM.
    Last edited by Shaun; 12-21-2010 at 09:40 AM.

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  6. #4
    B1 Racing cs19's Avatar
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    Low or very little pressure at low speeds is normal in the suction housing, where exactly did you take the pressure reading again? Not understanding your description.

    If your twisting a AA to 5400 with a stock 330 HP engine you might have something going on, is this 5400 when its up to speed or is that out of the hole?

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    Quote Originally Posted by cs19 View Post
    Low or very little pressure at low speeds is normal in the suction housing, where exactly did you take the pressure reading again? Not understanding your description.

    If your twisting a AA to 5400 with a stock 330 HP engine you might have something going on, is this 5400 when its up to speed or is that out of the hole?
    there is a 3/8 in dia tap in the the bowl to run a line for raw water cooling. I use this tap to feed my motor heat exhanger. Plumbing wise short nipple to valve to tee / psi meter and feed to heat exchanger. Only had one short run on a lake this year on my before freeze up. Today I am enjoying Edmonton, Alberta's fine winter weather of - 21c (-7f) and thinking of our short summer season already. 5400 rpm at top speed after tweaking timing. haven't scaled the boat yet but am guessing a dry weight of about 3000 lbs.

    motor from ebay purchase stock mercruiser 454, 330 hp 1988-1992 vintage mie
    berkeley jet local supply, definitely used but new to me. previous history unknown.
    aluminum hull - my work in progress purchased as incomplete hull only harbercraft 2275 fastwater originally built for hamilton 212, Modified bottom for berkely and built 454 engine mounts.

  8. #6
    Menominee, mi UP
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    you dont want high pressure comming from the bowl going into the engine, should be a gate valve or regulator so you dont blow all the gaskets out of the motor, 25 lbs should be enough

  9. #7
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by swgrguy View Post
    I have a new to me jc-a pump with I believe a aa impeler. Engine is stock mercrusier 454 with 330 hp. gps speed 46 mph
    boat is 22 ft 12 degree harbercraft.
    pump pressure was 60 lbs messured inches from engine cooling tap.
    engine rpm showing 5400 rpm.
    alomst no pump pressure till 2500 rpm.
    is this normal, or is their too much clearance between impellar and wear ring.
    definitely a newbie river boater.
    You should see a gradual steady increase from idle up to higher RPM , would check pressure elsewhere down stream from the Jet tap fitting and suspect you could have restrictions in block lines , manifolds (corrosion in fittings etc) along the way Alot may hinge on how this boat is plumbed . Also your Engine (depending on altitude) should be spinning a AA right at 4300 assuming your Tach is correct and your jet is healthy Tom

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