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If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
How do I remove the lower unit from my 1984 50 hp. Mercury outboard motor?
The 1973 model, 7.5 hp Mercury outboard, requires 6.8 oz. of gear oil.
Never mind I figured it out
Mercury® Marine High-Performance Gear Lube from Basspro
The lower cowl on a vintage 1973 Mercury 9.8HP outboard motor with 4 retaining bolts. They are passed through the cowl and directly into the body of the boat.
No
Take it to a marine repair shop or google it up, the answer is there
It is a speedometer pick up tube.no longer used due to clogging.
You will probably have to drop the lower end of the outboard. Its sound hard but really it is usually quite simple. The pump is nothing more than rubber impeller on a brass collet.
The answer is yes. the only catch is that you will need to find a second hand Force L-drive. The L-drive was an attempt from Mercury to use a force outboard motor as an inboard. Sadly they never got rid of the bugs of the u-joint system and scraped the idea three years later. They where only made from 90 to 93'. They use the power-head and lower unit from an outboard, but with a special U- joint system in the middle. I know this because I own a Bayliner Capri from 1991 with such a drive and I use Force outboard parts for spairs. If you can find such an L-drive then you could use your outboard, but hard to find. Try old Maxum or Bayliners from the early 90's. It might be easy (and cheaper) to find a complete L-drive boat with a broken powerhead then just the parts.
cobra outboard drive unit drain plug inner threads fell in unit