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Recent content by Ed-Mc

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    7.5hp Mercury lower unit/axel diameter

    Just an update; I was checking on eBay and it appears that later 4hp (single cyl) lower units have the same propshaft as the 7.5 and 9.8. So if you were to come across one of those, it should work too. Note I verified the propshaft part numbers were the same. BTW there are lots of lower...
  2. E

    7.5hp Mercury lower unit/axel diameter

    You want a 7.5 or 9.8 lower unit. The 4hp might fit but the propshaft is shorter and you probably won't find a 4hp propeller with enough pitch for your 7.5. I'm assuming by "non rounded" you have a fiberglass hood, which places your outboard at around 1976 or newer. Any lower unit from a...
  3. E

    Oversized pistons

    Check your max spark advance and use the highest octane non-ethanol fuel you can find. Also make sure the impeller is new and you have good water pressure. If the fitting for your water telltale isn't located at the top of the block, I'd recommend doing the mod to relocate it there. What...
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    Corrosion under water pump housing casket

    Permatex No. 3 Aviation-Type non-hardening gasket dressing would be suitable as a corrosion barrier for the gasket surface. You should be able to get the 4 oz brush-in-bottle online or at most local auto parts stores.
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    Continuity from tip to shaft on Mercury 1115

    I would suggest that there's something wrong with your measuring device. Maybe the meter has been damaged by the hi-voltage stray electricity. The fact that your tach works suggests that the stator is putting out AC voltage and the rectifier is working as well. When the rectifier is bad, the...
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