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    Overheating in '95 Mariner 225 caused by Lower Unit Corrosion?

    Plagued by overheating at higher RPM's on port engine (some heat buildup on stbd too.) Did usual: new thermostats, new water pumps, rebuilt pressure relief valve - no real help. Engine rigging unchanged since installed in 1995.<br />Have seen internal corrosion at top of lower unit between water...
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    '95 Mariner 225-Lower Unit Corrosion

    Plagued by overheating at higher RPM's on port engine (some heat buildup on stbd too.) Did usual: new thermostats, new water pumps, rebuilt pressure relief valve - no real help. Engine rigging unchanged since installed in 1995.<br />Have seen internal corrosion at top of lower unit between water...
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    1995 Mariner 225's Overheating

    Engines(twins)both show temp normal at idle to 3000 rpm. Engines overheat at rpm 3000 and over. Port worse than starbd. Usually takes 5-10 min. Changed impellers, thermostats, waterpump. Considering replacing water deflectors in cylinder head or removing powerhead entirely to check for carbon...
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