My Mercury 200HP EFI outboard lower unit needs to be replaced. The choices are $4,100 New Factory OEM Lower Unit, $3,100 Mercury OEM Remanufactured Lower Unit, $2,000 Rebuit Lower Unit, $600 Used Lower Unit or $795 New Aftermarket Lower Unit.
Yesterday marks the beginning of the 2009 season. I took the cover off the boat Sunday and began working through the long list of stuff that has to be done before the boat gets wet. A quick trip to Bill’s Outboard in Hingham MA was in order. Spark Plugs, plug wires, port and starboard thermostats, fuel filter-water separator, and an impeller kit were all on the short list.
The procedure for replacing the impeller outboard motors will vary some based on the manufacturer but there some are tell tale signs when it is in need of replacement. For me it was over heat warnings when trolling at very low speeds (under 1000rpms). Even without a warning system a quick inspection of the telltale stream for signs of cooling impeller failure or weakness is usually all that is necessary. If the stream is weak or nonexistent, first run a piece of wire up the hose to dislodge any sand or debris that may have clogged it.
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