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  1. merc850

    Getting a Mercury 9.8 TWIN running (1967)

    Re: Getting a Mercury 9.8 TWIN running (1967) Sorry, the old manual says J4J which is now J4C; the motor will only tilt up in forward gear and then you might see the co-pilot steering bolt. I would check the impeller first and replace it before running engine in water. I think that the L...
  2. merc850

    This is handy!

    Picked this up Saturday for $75 - it's a bearing carrier retaining nut tool, comes in handy for changing seals, shift cams etc. I have to replace the factory rectifier on my 1975 850 with a rec/regulator, which one should I use(part Nr.?).
  3. merc850

    Don't slag your Mercury Dealer!

    Went to my favorite Merc dealer Wed. and bought: 1 Crank seal 1 Bearing carrier O ring 1 Shift cam 1 Waterpump O ring 2 End cap O rings 1 Distributor gasket 1 Tapered driveshaft bearing-installed while I waited 1 LU bearing carrier locating key Total cost $181.00 All parts were in stock for a...
  4. merc850

    Socket adapter

    Here's a little device that might help loosen rusty bolts, it's a .250"socket adapter that goes in your drill. If you have a hammer drill you can put it in reverse and make it into a low power impact gun and the clutch will adjust the power.
  5. merc850

    1975 850 lower bearing

    Has anyone re and re'd this lower bearing without disassembling the powerhead like the manual says? 1975 Merc 850.
  6. merc850

    Gearcase tool

    Does anyone know a source for a new or used aftermarket Mercury Gearcase Cover Nut Torque adapter: part Nr. C-91-73688?
  7. merc850

    Merc 300

    Does anyone rember seeing one of these - what about working on one? I got this from a 1982 Merc catalog and I guess this was the highest horsepower OB at the time @5800rpm and it weighed 565 lbs.
  8. merc850

    Fuel filters

    I had a fuel problem on my recently purchased Merc 850 (1975), this has back draft carbs but they have a different top than the ones pictured in the manual. I went for a ride and the bottom cylinders lost power so I pumped the fuel bulb and they fired up again, I paddled in and checked the fuel...
  9. merc850

    Merc 850 16v alternator output

    According to my onboard volt meter and handheld VOM my alternator is putting out 16v. I know that 13 to 14v is the factory rating for a 1975 850; does anyone know what causes this and can you identify this part in the attachment (it was screwed onto the distributor front plate.)
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