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  1. J

    Powerhead Gasket for 1957 AD-11 7.5 hp Johnson

    Hello again, As I was bottoning my engine up after gearbox re-seal, I noticed a distinct difference on the Sierra powerhead to exhaust tube gasket then what shows in the Johnson parts catalog. The Johnson original p/n is 304314, Sierra's 18-2894. Other than some minor slot differences (no...
  2. J

    P/N for fill and drain plugs/gaskets 1957 AD-11 Johnson 7.5 h.p.?

    On my subject engine, the lower oil fill and drain plugs are a bit buggered, so I would like to replace them and gaskets with new. My part catalog shows: Part #23 Plug P/N 27-283 (2 ea.) Part #24 Gasket P/N 27-284 (2 ea.) I cannot find the part numbers listed on the web. I imagine this P/N...
  3. J

    1957 johnson 7.5 hp AD-11 lower unit removal - impeller replace

    Re: 1957 johnson 7.5 hp AD-11 lower unit removal - impeller replace Hello Chris, I don't know what the hole is. Perhaps a punched through mishap over the last 56 years. I finally got the hardware assortment out. I think only the pan head screw is correct. The others are by others! Back on...
  4. J

    1957 johnson 7.5 hp AD-11 lower unit removal - impeller replace

    A video on youtube shows how easy it is. Remove the powerhead by taking out seven screws, lift off, unhook the shift coupling, drop the lower unit, etc. But I find front screw underneath is a bolt head. Can't get a socket through. Do I really need to remove the powerhead on my unit? What is...
  5. J

    1957 AD-11 7.5 fuel line into carb

    Hello, I now find the clear plastic hose from the gas connector into the carburetor inlet is cracked. The hose is brittle and unusable, probably from age and ethanol. What are folks using? I currently have temporary fix with standard 3/16 ID automotive fuel hose, but fear the pinch point...
  6. J

    1957 johnson 7.5 hp AD-11 seeking fuel filter and gasket p/n

    I finished the ignition problem. Working on fuel. I need a new fuel filter and nut, and was wondering the correct part numbers are. Glass bowl also needs the o-ring. Can anyone help with the part numbers? One reference I found stated for a similar engine: Filter OMC 303133 Gasket OMC 303122...
  7. J

    1957 johnson 7.5 hp AD-11 fire on one cylinder

    Newbie here, find good info, but need help. I'm no electronic engineer, and my VOM meter is foreign and not utilized much. Anyways, got spark in lower, not upper. So, I do the coil checks, and though it has two differing aftermarket, both appear in good shape. Primary checks, and I get...
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