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So here's the skinny. After reading all the info out there on the 'proper' way to replace a leaking left crank seal, i decided to try to do it with the motor still in the bike. I then went to my local yamaha dealer and bought the LAST AVAILABLE left seal(with lip) and took it to a bearing shop to find a match. The part # for the lipless seal is TCM 32x48x7tc. Now for the hard part:
Remove the left cover and timing components. Make sure to etch the timing wheel at the marker with a sharpie to ensure proper reassembly. Do the same with the 2 large screws securing the round mounting block. After all the components are set aside, you should be able to see the seal. The seal is basically a thin metal frame coated in rubber. I used a razor knife/very small needle nose pliers for the next step. As much of the rubber as possible must be cut away and pulled off. The rubber between the seal and the crankcase is most important. Be patient, this step took me a couple of hours. Removing the rubber will provide some much needed wiggle room. After the metal on the seal is exposed, I used a very small flat screwdriver to pry the seal out. I then cleaned out the area thoroughly and left it to dry. After it was all clean and dry, I put a THIN coat of gasket sealer on the outside perimeter of the new seal and used a 1 1/4 inch socket to press the new seal on. Make sure the inner portion of the seal is seated correctly. Reassemble your components and give the sealant time to set up. This method was effective and I accomplished the task in an afternoon, which was important because my '79F is my only bike, and even in the winter, Texas affords us riding days every few weeks. Good luck!
Remove the left cover and timing components. Make sure to etch the timing wheel at the marker with a sharpie to ensure proper reassembly. Do the same with the 2 large screws securing the round mounting block. After all the components are set aside, you should be able to see the seal. The seal is basically a thin metal frame coated in rubber. I used a razor knife/very small needle nose pliers for the next step. As much of the rubber as possible must be cut away and pulled off. The rubber between the seal and the crankcase is most important. Be patient, this step took me a couple of hours. Removing the rubber will provide some much needed wiggle room. After the metal on the seal is exposed, I used a very small flat screwdriver to pry the seal out. I then cleaned out the area thoroughly and left it to dry. After it was all clean and dry, I put a THIN coat of gasket sealer on the outside perimeter of the new seal and used a 1 1/4 inch socket to press the new seal on. Make sure the inner portion of the seal is seated correctly. Reassemble your components and give the sealant time to set up. This method was effective and I accomplished the task in an afternoon, which was important because my '79F is my only bike, and even in the winter, Texas affords us riding days every few weeks. Good luck!
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