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  1. #1

    Default Vibration from mount failure or timming issue

    Is there an easy way to tell if vibration is caused by mount failure or a timing issue.

    On a separate issue may or may not be related....
    the manual has the firing order as shown however the firing order on the boat is as shown in red
    Click image for larger version. 

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    same sequence just different locations (out by one counter clockwise) on the distributor cap...

    here's a link to the engine run;
    https://youtu.be/-E5fI4-lPs4

    I appreciate all feed back.

  2. #2
    Join Date
    Apr 2010
    Posts
    3,647

    Default Re: Vibration from mount failure or timming issue

    Do a cylinder drop test on it and see how it's firing on each cylinder.
    Last edited by Boobie; 06-02-2017 at 10:23 PM.

  3. #3

    Default Re: Vibration from mount failure or timming issue

    So i gave it a whirl all sparks are good, still rough, so this may be a dumb question but I don't remember my last boat vibrating or the motor shaking the boat is there going to be vibrations.

  4. #4
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,144

    Default Re: Vibration from mount failure or timming issue

    Ayuh,.... It's skippin', 'n stumblin', not runnin' smoothly,.... also idlin' high,....

    It should idle dead smooth at 650/ 750 rpms,.... no surging,..
    Any Grease is Better,... Than No grease at All....

  5. #5
    Join Date
    Oct 2012
    Location
    sacramento, ca.
    Posts
    306

    Default Re: Vibration from mount failure or timming issue

    bring it up to TDC......., pull the cap off and look where the rotor is pointing. that is number one. (if you did not pull the distributor). even if you did, and it is at TDC, but pointing in a different location, that is ok, just put number one wire in that location, and continue with the firing order. is does not matter where the rotor is pointing when it is at TDC. just sync the firing order with that location.a lot of people will say that the rotor has to "point to number one". they get that confused with number one location of where you want number one wire at on the distributor. the distributor could care less where it is pointing, as long as it is firing the correct plug.
    *** 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
    Join Date
    Jan 2016
    Location
    Long Beach CA & Cape Town
    Posts
    265

    Default Re: Vibration from mount failure or timming issue

    unless you had a cam change the firing order should be stamped on the intake manifold. Remove plug #1, rotate motor till its about 45 degrees from the ) mark. Put finger over plug hole and seal it 99%, turn motor over - if a firm stream of air is pushing past finger you are on the compression stroke - rotate to 0 mark and make sure distributor rotor is pointing at the wire for that plug.

    If no air you are on the exhaust stroke - rotate crank 180 degrees and repeat the finger test - turn till on 0, check rotor is pointing to where the #1 plug lead goes on cap.

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