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    Obstructed water passages & inner ex. tube carbon

    Re: Obstructed water passages & inner ex. tube carbon I never got a reply to this post so I went ahead and scraped the carbon out of the inner exhaust tube. I figured I couldn't do too much damage. I'm hoping to put the lower unit back on this afternoon and test it, but I'm concerned about the...
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    Obstructed water passages & inner ex. tube carbon

    I can see that there is some scale that is partially obstructing the water passages above grommets inside the exhaust tube. There is actually more obstruction than the photos show (blue arrows). Tough to get a decent pic up in here. Are those passages cast as part of the tube itself and can I...
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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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    Replace rivets in aluminum hull

    Re: Replace rivets in aluminum hull I bought a bucking bar and rivet set for universal head solid rivets. A friend came over and laid under the boat with the rivet set backed up with a sledge then, when he hollered, I whacked the bucking bar with a 4 lb hammer. It took 4-8 hits to tighten them...
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    Cracks in aluminum hull braces

    Re: Cracks in aluminum hull braces I'll update this thread even though it's been a couple of months since I started it. I opted not to do any additional brazing, but instead to use a combination of rivets and screws shimmed with washers, then apply a couple of coats of Gluvit. I guess I won't...
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    '69 40hp LU driveshaft bearing

    Re: '69 40hp LU driveshaft bearing Thanks, although I spoke too soon. The larger of the two tap sockets was required for the 5/16" tap, but has too large a diameter to fit down inside the case. Bummer. Not to worry, though. I ultimately followed your suggestion (basically) and pieced together...
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    '69 40hp LU driveshaft bearing

    Re: '69 40hp LU driveshaft bearing Well, I certainly don't whether or not the top/btm installation of these parts may have changed from time to time or varied depending on HP, etc. However, this is a 1969 (or maybe 1970) 40hp LU. The parts install from the bottom as shown in these photos.
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    '69 40hp LU driveshaft bearing

    Re: '69 40hp LU driveshaft bearing Thanks, F_R, that's really helpful. Having never seen some of these parts, it's a little hard to tell, especially from the parts diagrams. Take a look at this image... First, it shows the shift rod bushing, O-ring, and gasket above the gearcase, as though...
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    '69 40hp LU driveshaft bearing

    Re: '69 40hp LU driveshaft bearing I bought a cheap set of screwdriver/prybars from the bargain bin at the hardware store. One worked well to pry the seal out (after a couple of other failed, albeit more elegant, solutions). Then I fabricated a bearing removal tool by taking the big 12" pry...
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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?

    Re: Wear on coils? Here are a couple of photos of the underside of the flywheel. Doesn't look too bad to me but, as I demonstrate here on a daily basis, I'm no expert.
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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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