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  1. #11
    Gold Member Gold Member augie58's Avatar
    My Boats:
    98 formula 353
    Join Date
    Apr 2002

    Re: HP 500's-Most hours?

    470 hours valve springs and lifters at approx 300 hours. the engines burn maybe 1 qt of oil in 20 hours. did a leak down test at around 400 hours and everything was good. i expect a total of 550 to 600 when i freshen them. probably do some upgrades short of blowers
    life is an incredible journey--might as well live it large

  2. #12
    Who Me? Platinum Member FeverMike's Avatar
    My Boats:
    2006 38TE Fountain
    Join Date
    Jan 2001

    Re: HP 500's-Most hours?

    I had a HP500 in my 29 Fountain and when I sold it, it had 250 or so hours on it. The guy I sold it to ran it for some more hours and then tore it down to change it over to a blower motor. He told me the engine looked like new inside, everything was in perfect shape, springs, valves, bearing, cam and crank shaft, water cooling passages showed no signs of salt water and this had to be clase to 300hrs and all in salt water.
    During my time of ownership I changed over to Mobil 1 synth oil at 20hrs and changed the oil every 30-40hrs which for me was around 4 times a year. I also flushed with Salt-A-Way every time or at least every other time.I changed plugs and distruiber cap and rotor every season.
    Enjoy your HP500's, they are great engines!

  3. #13
    Registered Airpacker's Avatar
    My Boats:
    little cat...BIG MOTOR
    Join Date
    Aug 2001
    Aurora Ontario

    Re: HP 500's-Most hours?

    Quote Originally Posted by motobri
    75% of my hours have been under 4500 rpm, do you mind sharing the total cost for your rebuild, roughly?

    Lucky for me drives have been solid for XZ's. One minor repair.

    By the time its a 572, I should be into it for another 12 grand or so I figure.

    PS, I pulled the heads at 250 hrs and there were 9 cracks between the valve seats spread between two heads. I swapped them out for the edelbrock marine aluminum heads at that time. New lifters, springs, retasiners, keepers and rocker arms.

  4. #14
    Platinum Member Platinum Member socalstone's Avatar
    Join Date
    Sep 2006
    Lake Norman, NC

    Re: HP 500's-Most hours?

    A buddy of mine has a Checkmate with a hp500- In the owners manual it quoted that the engine was "built to run at or near full throtlle for 500 hours" -pretty cool statement. I think he is at about 400hrs. I know he does not have the power he used to have, and is thinking rebuild as well. I've noticed Mercury has a rebuildd program now. Might be worth considering. I'd bet it is pricey, but can't imagine anyone knowing the motor better. and it may come back to you with a warranty.

  5. #15
    Forum Regulator VIP Member Sydwayz's Avatar
    My Boats:
    37' Active Thunder AVH; 17' Speedliner Cat OB
    Join Date
    May 2001

    Re: HP 500's-Most hours?

    Bob and Shari Smallwood have over 700 hours on their 37AT with HP500s. (I think they are EFIs.) I know Bob runs the boat REALLY easy, and I don't know if he has had them freshened, but that is a testament in itself. (Mostly salt-water as well.)

  6. #16
    Join Date
    May 2005

    Re: HP 500's-Most hours?

    Quote Originally Posted by berns29scarab
    what make and model boat are they in ? weight ?

    they are in a 30 ft Hallett that weighs about 8000 lbs.

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