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Thread: siezed engine

  1. #1

    Default siezed engine

    hello I have a seized 350 it was said its seized from sitting to long I've tried marvel oil, PB Buster, and a 1/2" braker bar with do luck. I was told buy an old timmer to try pepsi-cola. does anyone have a idea that may work, I really don't want to snap the damper bolt off. there was no water on the dip stick so I am guessing its frozen rings. but that is just a guess at this time.
    Thanks Bob

  2. #2

    Default Re: siezed engine

    MOD. NO. MP350ANS
    SER. NO. AN89033612S

    Thanks Bob

  3. #3
    Join Date
    Sep 2010
    Jersey Shore

    Default Re: siezed engine

    If it's frozen its done.
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  4. #4
    Join Date
    Mar 2009
    Portland, Oregon,

    Default Re: siezed engine

    DO NOT use the front crankshaft balancer bolt for this!

    Try a strap wrench.
    Try making a tool that will fit into the three spokes of the balancer.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

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

  5. #5
    Join Date
    Oct 2012
    sacramento, ca.

    Default Re: siezed engine

    myself.....i would pull both heads off and start there. replacing gaskets are cheap . even if you do free the engine, i would want to look at the cylinder walls.
    *** In comparing the virtues of various calibers, using hollow point ammo: it is absolutely undeniable that, while a 9 mm or .40 S&W may or may not expand, a .45 will never shrink. ***

  6. #6

    Default Re: siezed engine

    My next step is to pull the heads, but I am looking to also make a jig to fit the bolt pattern on the damper and turn the crank shaft that way

  7. #7
    Join Date
    Dec 2005

    Default Re: siezed engine

    I know this is an old thread, and I hope you have had success with the motor by now. Part of the problem with the heads still on, might be the fact the valve stems are rusted too. In addition, the lifters may be stuck, all keeping the motor from spinning. Removing heads and intake will expose all of this for direct application of penetrating fluids. :-)

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