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1971 Mercury 115 1150 6 cylinder

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  • 1971 Mercury 115 1150 6 cylinder

    I have a 1971 Mercury 115 horsepower I don't know if I have the right flywheel when I line up three dots on the flywheel to line up with the* pulley line the flywheel dots are* all over the place I have the number one Piston at dtc and still cannot line up the three dots on the flywheel to the line on the pulley can anybody help me use motor I bought it off somebody that has no spark i thing some one remove the flywheel

  • #2
    If the flywheel was partially removed by taking out the 8 screws or small bolts holding the flexplate to the hub, it's possible it was reassembled out of time.

    To check - Remove the flywheel nut, rotate the motor until it's approximately at TDC and look at the crankshaft key position. At TDC the key points directly to the center of the distributor shaft. Reinstall the flexplate with the timing marks in line with an imaginary line from the key to the center of the distributor shaft.

    Next take the timing pulley belt flange off and see if the arrow on the timing pulley points directly to the flywheel timing marks. If they aren't in line, remove the timing belt from the distributor, it slides up and off as the flywheel is rotated. Put the belt back on, again it slides down as the flywheel is rotated and you have to offset the timing pulley a tooth or two until the flywheel key/timing marks are in line with the arrow.

    When the timing pulley arrow, flywheel timing marks and flywheel are all in alignment, button everything up and put the flywheel nut and timing pulley flange back on. At this point the motor is timed except for max timing advance, but this shouldn't be off unless some one has fiddled with the timing stop screw.

    To make things a little easier when rotating the the flywheel/hub, take out the spark plugs
    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.


    • #3
      Gee, taking the flywheel off is not necessary. Set the top piston to top dead center. Look at the timing marks on the cowling support. If they do not indicate TDC, or real close, the outer flywheel is on wrong. Remove the 8 bolts and rotate the outer flywheel until she indicates TDC, or closest. Now remove the distributor pully cover and see if it points to the one (or three) punch marks (dots on decal) on the flywheel. Remove the distributor belt and adjust the pulley to point properly.

      Now finish the link and synch procedure.


      • #4
        thanks you I just got this motor from some who missed with it it looks like that will do that today


        • #5
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