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  1. #1

    Default Piston rings Chrysler 9.2 (1966)

    Hello all,

    new to marine. Just purchased a boat/motor package and the chryeler 9.2 is down on power. I did a compression test and both cylinders are at 70psi.

    Can anyone tell me where I can get new piston rings or even a part number?? been researching but cant find anything.

    Thanks

  2. #2
    Join Date
    Sep 2010
    Posts
    19,784

    Default Re: Piston rings Chrysler 9.2 (1966)

    Did you take the cylinder head off to inspect anything ?-----If pistons are scored then rings won't fix it.

  3. #3

    Default Re: Piston rings Chrysler 9.2 (1966)

    The bore is not bad for the age and I would idealy like to replace the pistons to if I can find them.

  4. #4
    Join Date
    May 2010
    Location
    Sebastian ,Fl
    Posts
    3,007

    Default Re: Piston rings Chrysler 9.2 (1966)

    IF????? both pistons are at 70# ????
    I'd guess the gauge or the way the test was done was faulty????
    Depending on the flywheel? if there's a nut on top? you can remove the plugs and hook up a drill
    to spin the flywheel.
    Way easier than pulling and pulling.

    Both at 70 shows the comp is even(good)and probably doesn't need rings.

    Finding pistons and rings for something that old???? not gonna be easy.
    Try Franz Marine.
    PLEASE,NO PERSONAL MESSAGES IF THE QUESTION CAN BE ASKED ON THE OPEN FORUM
    88 Bayliner with 2002 225 HP Mercury
    Buy American made Cars and Trucks!!!Towing insurance,get it.
    In Scenic Beautiful Sebastian by the sea Florida

  5. #5

    Default Re: Piston rings Chrysler 9.2 (1966)

    The issue I have is the motor does not hit max RPM on the water and is lacking top end power. Runs well in a bucket but cannot get the small 12 ft boat onywhere near a plane on the lake. Everything seems good with the motor and I purchased it as (fully serviced) by a small motor mechanic but when I compare to videos of similar motors at WOT mine is not making the revs or the power.

  6. #6
    Join Date
    May 2010
    Location
    Sebastian ,Fl
    Posts
    3,007

    Default Re: Piston rings Chrysler 9.2 (1966)

    What rpm's does it make?
    You sure both plugs are firing?
    The diaphragm in good shape?

    Should be a tag someplace on the bottom cowl that has performance
    data on the tag???
    Then hook a tiny tach to it and see what rpm's at wide open your running??

    IF?? the boats overloaded not firing on one cylinder, or has the wrong prop? all would lower the rpm's .

    My neighbor has a 9.9 and it ran pretty good but he said it should be faster.
    We put it in the water and he was right, a real DOG!!!
    I started checking things??
    Turns out he wasn't getting spark on the bottom cylinder
    The plug wire was laying in the bottom and unhooked(simple things )
    PLEASE,NO PERSONAL MESSAGES IF THE QUESTION CAN BE ASKED ON THE OPEN FORUM
    88 Bayliner with 2002 225 HP Mercury
    Buy American made Cars and Trucks!!!Towing insurance,get it.
    In Scenic Beautiful Sebastian by the sea Florida

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