Re: ’76 Mercury 70 HP

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May 28, 2017 at 9:35 am #58502
billw
Participant

    US Member

    The poppet valve, which is a cooling system pressure release, is on the port side of the engine. However, water is only going to come out there if the rubber diaphragm that controls it, has a hole in it. Water should not normally come out there. If you have a fresh water-only engine, that should be pretty easy to change. Salt water, you may run into frozen bolts.

    "Clean up unnecessary wiring?" ON THE ENGINE????? That sounds scary to me…..Mercury would not have put any unnecessary wiring anywhere!

    Again, with any three cylinder 70, the very first tool I would always pick up was the compression gauge.

    Long live American manufacturing!