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  1. #1

    Default Mercruiser 5.7 MPI - Overheated and Now it Won't Crank

    Hi Folks,

    I own a 2003 Centurion Vdrive with mercruiser 5.7 MpI. I've owned this boat for almost 4 years and had little to no trouble with it up to this point. But now i need HELP!

    Last week we were the only ones on a private lake so we decided to hot rod the boat a bit as we never get this opportunity! We launched the boat and quickly got the boat up to full throttle. We had been running it for maybe a full minute or possibly less when the warning alarm sounded. I looked down at the guages and the temp gauge was pegged hot. The motor stalled before I even had the chance to shut it down. I let it cool down and then went to restart. The engine would not even crank most tries, it just made a hard clunk and a couple times it cranked maybe a 1/8 revolution? I towed the boat home and still would not turn over the following day. I pulled the belt off and attempted to turn the motor over (clockwise) by hand with no success. I'm planning on ordering a reman engine and installing it myself, but i just don't understand why the motor would at least not crank over after a quick overheat event? All fluids are clean and full and there was no noise prior to it stalling.

    Is it possible that there is a problem with the drive that could have caused the overheat and also tied up the motor? I hate to put a motor in this thing and then still have the same problem!

    Any input or ideas would be appreciated!!

    Bill

  2. #2
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    5,374

    Default Re: Mercruiser 5.7 MPI - Overheated and Now it Won't Crank

    Pull the spark plugs and let the water out of the cylinders and try again.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  3. #3
    Join Date
    Jun 2008
    Location
    Island Heights, NJ,
    Posts
    3,015

    Default Re: Mercruiser 5.7 MPI - Overheated and Now it Won't Crank

    Quote Originally Posted by Docksidemarineservices View Post
    Pull the spark plugs and let the water out of the cylinders and try again.
    .....let the water out by cranking the engine with the plugs out.

    How old is (was???) the raw water pump impeller?
    Capt Bob
    1969 23ft ChrisCraft Lancer
    Merc 5.7L 260HP/ Volvo 280
    1972 22ft Bristol
    Honda 7.5HP 4 stroke Long shaft

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