Re: lower oil seal
First! make sure the oil drip is gear oil, not unburned oil, and gas. If it truly is gear oil, you can do this. Remove the prop, along with the spacer at the rear of the prop. Looking down inside the exhaust hub, or prop shaft bearing carrier, You will see four bolts. Remove these! If the engine has not been run in salt water, or it's your lucky day, you can pull the carrier out of the gear case with a slide hammer with a hook on the end, or otherwise a gear puller with 5/16-18 bolt's about 6" long. When removed, the prop shaft seals can carefully be pried out, and then replaced with a socket of the proper size to act as a driver. Replace Carrier O-Ring, plus the O-Rings under the head of the carrier retainer bolts. Seal with OMC gasket seal. You will need two headless guide bolts threaded 1/4"-28 to act as guides to align the carrier bolts with the retaining ring, make these threaded rod's about 8" long. When you have the carrier aligned on the guide bolts, carefully drive down to it's seat with a plastic mallet.
