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    LU bearing and seal adhesive or sealant?

    I'm going to apologize for reposting this question from another thread. I don't know if forum rules permit that or not. On the matter of sealants in general, I think I've read 50 threads on this topic but, predictably, there are a number of different opinions. The manual doesn't say anything...
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    Keeping the LU exhaust drain clean? ('63 40hp)

    I read a couple of posts that mentioned reaming out the exhaust drain while servicing a LU, so I worked on that last night. Not an easy job in this case. It probably took me over two hours. There was so much carbon packed so tightly at the bottom of that cavity that I actually found a diamond at...
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    '69 40hp LU driveshaft bearing

    I opened up the lower unit yesterday which is from a 1969 40hp (thanks for ID-ing it, F_R), and the driveshaft (upper) bearing basically fell apart. Some of the pins looked very pitted and generally crappy. It doesn't look like it will be too difficult to replace that, although I may need to...
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    Torque values wet or dry?

    Just as I was about to really put the hurt on my flywheel nut with the torque wrench, I realized that the anti-seize compound I had just put on the threads was going to potentially change the amount of torque I need to use. 1) Does anyone know if the torque values in the factory service manual...
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    '63 40hp lower bypass cover hose

    I'm replacing all of the hoses on my 40352D. The one that runs from an elbow on the lower bypass cover around to the pressure port on the fuel pump is unlike any of the others. It is reinforced and has a smaller outside diameter but I think it's 5/16" ID like the fuel hoses. Is there something...
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    Triple Guard grease substitutes?

    I've read many posts on this topic but none have mentioned a couple of products I'm wondering about: Syl-Glide Permatex Ceramic Extreme Brake lube/assembly grease Both are water-proof and high-temp, (600?F and 2800?F, respectively). The latter is also corrosion resistant. It's not that I...
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    Wear on coils?

    I got the flywheel and magneto pulled off of my '63 40hp 40352D, and I noticed that there is some wearing on the brushes (? contacts? - not sure what these are called) of both coils. Is this normal or were these improperly positioned by the previous owner/mechanic? My understanding is that...
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    What is this 40hp lower unit from?

    This is the lower unit that came with the 40352D that I recently acquired. It is obviously not original. I'm assuming that it's a little older. No water bypass screen or plate, just a small hole there. Also, you can see that the water pump is configured differently with only a single tube...
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    '63 40hp caulk/washers lower manifold screws?

    Sorry to be such a pest with so many fussy little questions. The two lower intake manifold screws on my 40352D pass first through the lower part of the starter mounting bracket. When I removed them, one had a red fiber washer and the other had red silicone caulk, and they both had star-type...
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    1963 40hp thermostat, housing, & pressure control valve

    While going through the 40352D that recently acquired, I thought I'd take a look at the thermostat. Guess what - no thermostat! So I figured I'd just take the one out of 40302D parts motor. You guessed it, no stat in that one either. Were there some cooling system issues with these motors that...
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    Big Twin 40 oil drain screen springs shot

    I took apart the oil drain on my '63 Big Twin 40 today. I'm not sure how important it is to clean that, but I just got this motor and I'm going through it. I like to know where everything is at with a new motor/vehicle, plus I had the carb, starter, and generator mount off so it was pretty easy...
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    Float bowl weeping milky substance after cleaning

    OK, this is weird. I was in the process of putting my carb back together (1963 Big Twin 40) and I decided that the float bowl didn't look clean enough. I had but it into carb dip then cleaned with carb spray a couple of weeks ago, but it seemed like there was still some discoloration in the...
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    '63 Big Twin low speed needle change?

    I managed to find a "new" low speed needle for my 1963 Big Twin 40 carburetor. That part number according to my parts catalog is 308076. It came in an original OMC package but the shape of the tip is quite different from what was in my carb. The new one (on the bottom in both picture below) is...
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    Big Twin cut-off switch questions

    I have removed, disassembled, and cleaned the cut-off switch from my 1963 Big Twin 40 (40352D). The diaphragm is in very good shaped. I treated it with some rubber rejuvenator fluid that I use on my motorcycle carb diaphragms. Two questions... 1) When I got this motor, neither the wire from the...
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    Water barrel for shop testing

    I thought I'd post this photo of the 55 gallon plastic drum I put together for testing my motors in the garage. There's a 1" PVC ball valve mounted near the bottom of it with adapters so I can connect a garden host to it for draining. I'm wondering about a couple of things, though. First, is...
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    Making your own gaskets?

    I keep a roll of rubber fiber gasket material (for oil, gas, and water) on hand and routinely cut my own gaskets for auto and cycle, especially when buying pre-made gaskets gets costly. Not appropriate for everything, but you can use it for a lot of different applications. Does anyone make...
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    Substitute/replace starter solenoid & junction box ? - Big Twin

    I acquired another Big Twin 40 yesterday. This one is a 40352 (electric start) and seems to run and idle OK. However, the guy would not part with the controls, although I never saw them so I don't even know if they were original. I wasn't aware that the system includes a starter solenoid in a...
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    Difference between Evinrude 40302 & 40352?

    I've got a '63 Big Twin 40 - a 40302-D - and am going to look at a 40352-D tomorrow. (I need parts.) What's the difference? I assume the "5" digit indicates some specific feature.
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    Can you ID this Johnson 40 horse?

    Can anyone give me a ballpark ID on this motor? It's kind of a complicated situation, but I'm going to have to drive a couple of hours to take a look at it. The seller isn't near the motor either, so he can't give me a model number. It is for sale with no controls and the guy doesn't know...
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    Test for leaks by putting water into boat?

    I have a 1960 Crestliner Imp. Flying Crest (aluminum hull) and am in the process of replacing rivets, and trying to fix leaks. The boat is on a pair of very strong stands. I realize it wasn't designed to hold water - certainly not out of the water - but I'm wondering if I can get away with...
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