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I am the one giving Melugin advice about his motors. My understanding was they were not salt motors. The plastic guide #321513 ref#114 in ME for Exhaust Hsg section is what I am referring to. If the motor has been over heated to any amount that guide will close at the top restricting water flow. The grommet #302497 should be replaced while you are there. Like Don has said many things can cause problems with this motor pumping water. Is the motor getting hot or just not indicating water out the overboard pisser? Again Don mentions that OMC overboard indicators just show the pump is pumping, not that the motor is not getting hot! You can have no indication out the pisser and still have no overheat problem.
Assuming you have an overheat problem at this point, then you have all the possibilities Don has brought up + exhaust cover inner plate being warped. That lets exhaust gases into the cooling system. It could give you the pulses you are talking about. The water deflector under the head gasket could be out of place or melted. Several other more complicated things, but we can save those till we get answers to above questions.
Dan in TN