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  1. merc850

    Mercury 65 HP 4 Cylinder Wiring Diagram

    If you haven't found a wiring diagram here it is
  2. merc850

    Forward and reverse

    It's possible that the upper shift shaft has twisted especially if is on a motor that has been sitting in salty or highly acidic water for 40+ years. This happened to me it will go F - N but because it's twisted there isn't enough travel to reach R. I bought another motor with a perfect shaft...
  3. merc850

    Mercontrol problems 85 hp model 850

    If the pump motor is working then maybe you should bleed the system
  4. merc850

    Buying 1970’s Mercury power trim?

    You need the switches/wiring harness, the cables for power from the battery, 4 hoses,rubber bushings for the shock mounts and you remove the reverse lock cams from the LU. You will also have to bleed the system. One thing that can happen is the motor brushes wear down so the motor won't work...
  5. merc850

    More 1977 850 Merc problems

    If it really is a 1977 this wiring diagram is it, the rectifier only charges the battery the ignition is fired by the stator/trigger assembly and this requires the motor to turn over quickly; you can even run it with the harness disconnected. I would check the ground wires at the switchbox and...
  6. merc850

    Mercury 500 water pump replacement questions the

    The long piece goes into the outlet - taper facing up, the round piece looks like the slinger which goes on the driveshaft after the pump is assembled. Push it down until it's just above the pump housing but not touching. You'll also need the long plastic piece that guides the water line into...
  7. merc850

    replaced water pump problem..I think

    Here's a cut thru showing the internals; the exhaust goes down the tube to the prop and water surrounds it.
  8. merc850

    Possible new trim pump?

    If it's the older system with the pump inside the boat you have to bleed the system if it has the pump and rams between the clamp bracket you cycle it a few times.
  9. merc850

    80s mercury classic 50 overcharging

    I put a regulator in my motor last year, the regulator is a Mercury one that I had lying around and I bolted it to the front cowl support (I think it should be grounded). This gives me 13.5 v constantly.
  10. merc850

    1980 Mercury 115 power trim wiring

    That switch circled is the tilt limit switch that you set for max trim after you set up the motor; this diagram is for the 3 button switch panel so you might have to add a switch for trailer mode.
  11. merc850

    convert outboard from manual to electric trim

    Drop the LU and remove the reverse lock cams from the shift shaft (be careful that you don't pull out the shift shaft) this allows you to set the tilt pin in any hole for proper operation. Grease the splines before assembly.
  12. merc850

    Surface gap plugs

    Can someone tell me what differences there are between the L76V - L77V - L78V spark plugs?
  13. merc850

    Kiekhaefer "Rocket" 7.5 hp Outboard KE-4

    Here's a complete one in 1975 that my friends owned, I think they still have it.
  14. merc850

    synthetic oil makes for easier starts on 90hp merc '99 model

    I have a 1975 850 and I use Amsoil at 70:1 - I also use their gear lube, the combination works very well. I have a 1960 Merc 700 (Direct Reversing [R.R ]) that ran for 10 yrs.on 100:1 Amsoil and the performance was outstanding - pulling tube/skiers and other boats; synthetic oil is also...
  15. merc850

    Anyone have a picture of the "primary pickup cam" for a 1976 Merc 850?

    I think this will cover it
  16. merc850

    1974 merc 1150 idle adjust

    You have to adjust the throttle cable brass barrel to push the arm backwards, then push the handle fwd and see if the dist stops at the "max spark adv." screw; then push it farther to the "throttle stop" screw and make sure that the throttles are full open. Don't let the carb shutters act as a...
  17. merc850

    39082 Fuel Pump

    Since I don't know the pump style by the part nr. here are two pages from different manuals that show fuel pumps I don't know what manual you're using but you can see every pump uses 2 valves.
  18. merc850

    '60 Merc 400 runs great for an hour then starves for fuel

    If you're going to work on the magneto follow this diagram; the magneto is held on by 4 cap screws and can be replaced without removing the adapter.
  19. merc850

    Wits End on Lower Unit .Please Help.

    Did you follow this directive? Perfect Seal is available from Merc and can be used for many applications. Also, did you replace the O-rings on the carrier, the waterpump base and; tork the nut to 110 ft/lbs?
  20. merc850

    1984 Mercury Power Trim Wiring Help needed

    This diagram might be applicable if yours is the 2 ram type.
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