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  1. #1
    Join Date
    Feb 2020
    Location
    Moorpark, CA
    Posts
    10

    Default Pulley bearing noise, which one?

    Hi all,

    An issue on my other engine. Approx. 1991 Gen 5 454. There is a loud squeaking noise from the front of the engine after it warms up a bit. I assume it is a bad pulley bearing. How do I isolate which one? The belts seem to have proper tension. Fresh water pump vs. raw water vs. alternator?

    Thanks,
    Barry

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    8,070

    Default Re: Pulley bearing noise, which one?

    you can remove the belt to isolate the raw water pump from the circulating pump and alternator....regarding separating the source from the circulating pump or the alternator, when you remove their belt, both should be free and any roughness felt while manually rotating the pulley should indicate the culprit...

  3. #3
    Join Date
    Feb 2020
    Location
    Moorpark, CA
    Posts
    10

    Default Re: Pulley bearing noise, which one?

    Thank you! I will work on it this weekend.

    Barry

  4. #4
    Join Date
    Feb 2020
    Location
    Moorpark, CA
    Posts
    10

    Default Re: Pulley bearing noise, which one?

    Thanks Makomark!

    I removed the belts. The fresh water pump pulley was completely fine. The alternator pulley is minimally bent (wobble) but turns smoothly. I think it is fine.

    The raw water pump pulley was very difficult to turn. I removed the pump and took out the impeller. The pulley was still very difficult to turn, almost frozen. I think I have my diagnosis. I sent the pump out for a rebuild.

    Thanks again!
    Barry

  5. #5
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    8,070

    Default Re: Pulley bearing noise, which one?

    i think you did well on that one...good luck!!

  6. #6
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    11,684

    Default Re: Pulley bearing noise, which one?

    ..........................
    Quote Originally Posted by Barry
    I removed the belts. The fresh water pump pulley was completely fine. The alternator pulley is minimally bent (wobble) but turns smoothly. I think it is fine.

    The raw water pump pulley was very difficult to turn.

    Barry, you should have only three belt "driven" devices with pulleys.

    ....... engine coolant "circulating" pump as Mark alludes to
    ....... alternator
    ....... seawater pump (if belt driven)



    I removed the pump and took out the impeller.
    The pulley was still very difficult to turn, almost frozen. I think I have my diagnosis. I sent the pump out for a rebuild.

    Barry, if you have the space in front of your harmonic balancer, consider going to a Johnson F5B-9 or F6B-9 crankshaft style seawater pump!
    This style pump has no side load against the shaft (from drive belt tension), of which allows the shaft bearings to last much longer!
    They will typically outlast any belt driven seawater pump.

    You rid yourself of one pulley and the related drive belt as well.


    Last edited by RicardoMarine; 02-17-2020 at 07:21 AM.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  7. #7
    Join Date
    Feb 2020
    Location
    Moorpark, CA
    Posts
    10

    Default Re: Pulley bearing noise, which one?

    Thanks Rick!

    This looks like a great option. Let me see how things work when I get the rebuilt pump back and start the engine again.

    Barry

  8. #8
    Join Date
    Feb 2020
    Location
    Moorpark, CA
    Posts
    10

    Default Re: Pulley bearing noise, which one?

    So, I sent the raw water pump out for a rebuild: rawpumps on eB*y. They did an awesome job for a reasonable price. New bearing, impeller, bolts, paint etc. I reinstalled it a few days ago and no pulley noise! I also put in a new hose from the V-drive to the pump. The old one was in bad shape with a flat spot possibly obstructing flow. The hose from sea cock to V-drive is also new.

    Thanks everyone for the help!!

    Barry

  9. #9
    Join Date
    Jun 2006
    Location
    Spotswood, NJ, USA
    Posts
    4,940

    Default Re: Pulley bearing noise, which one?

    or the Bravo pump
    click to enlarge

  10. #10
    Join Date
    Feb 2020
    Location
    Moorpark, CA
    Posts
    10

    Default Re: Pulley bearing noise, which one?

    Looks nice!

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