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Water got into my Yamaha F250 lower unit. When I did my water pumps I checked the driveshaft seals and they looked good. I noticed last season a slight oil slick when the engine was lowered. I thought it was my bad hydraulic tilt ram seal. When I went to check and top off my lower gearcase, chocolate milk came out of the drain hole. Fortunately, it was only one engine but if it was both, the fix would have been a few minutes longer. Normally this could be a tough job and expensive. To normally get the seals out, you need special tools such as a good size gear puller and possibly heat to pull the bearing housing out from around the prop shaft. Being a part redneck, shade tree mechanic, there had to be another way. Turns out there is. First, I had to remove the prop and gave the prop shaft seals a good dose of Kroil Penetrant (the best penetrating fluid IMHO). Instead of using a puller, I drilled two sheetrock screws into the outer edge of the first seal being very careful not to hit the prop shaft (that would be bad). From there, I used two pry bars to hook around the heads of the drywall screws. With equal pressure on the pry bars, the seals came out fairly easily for being in there for sixteen years. Once the outer seal was out, there is an identical inner seal right behind it and I used the same procedure. The new seals are easy to put in. First, I cleaned the shaft making sure it was smooth where the seals contacted the prop shaft. I used 600 and 1000 grit. It's recommended to use Quicksilver Bellows Adhesive on the new seals. A light coating and it allowed the two seals to slip in and start them. I then used a 1 Ā¼ pvc pipe to seat each of the seals. Overall, it was a half hour job once all the tools were ready to go.

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Outer seal.
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Inner seal with two dry wall screws.
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Many times guys find the tell-tale stream is weak. Mine was. I changed the water pump but still no strong flow. You can try weed wacker line up the hole of the tell-tale. It sometimes works. I didn't for me yesterday. I decided to change my thermostats which is a fairly easy job on a Yamaha F250 once you move a few things out of the way. I left one thermostat out to relieve air pressure and used a piece of aquarium hose that I flared with a pencil to cover the tell-tale hole on one end and flared the other end to fit my air gun. Gave it a quick shot of air and it worked like a charm. I wish I could pee that good.
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Don't you hate this?
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