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  1. merc850

    1970s Mercury power trim with 3 button panel

    Re: 1970s Mercury power trim with 3 button panel That's correct, you set the trim limit switch while underway to stop motor from tilting too far - the middle button goes from full in to limit setting.Make sure that tilt pin is in lowest hole. here's how you bleed the system.
  2. merc850

    Tachometer hook up on mercury 850 85hp

    Re: Tachometer hook up on mercury 850 85hp One of these should be the rectifier on your motor, you hook a wire to one of the yellow leads and attach it to the SENDER terminal on the tach. Hook the other leads to + - etc.
  3. merc850

    mecury tilt/trim pump ?

    Re: mecury tilt/trim pump ? The brushes failed on mine last year and a dealer had the end cap with brushes attached (old cap here for example) but you have to use silver solder to attach,the cap also has a thermal cutout in it.
  4. merc850

    1961 mercury 45hp magneto. I need some guidance

    Re: 1961 mercury 45hp magneto. I need some guidance The LU is the same only the waterpickup locaton is different Here's some info on setting up the mag.
  5. merc850

    72 Merc 65 hp prop questions

    Re: 72 Merc 65 hp prop questions I would say that a tach should be your first purchase because the motor is designed for a max. operating range (ie. 4800-5200 rpm) and unless you can measure its rpms you can't match boat and motor.If you have a dealer near you he might let you try different...
  6. merc850

    Cant get to the carb! I want to rebuild it.

    Re: Cant get to the carb! I want to rebuild it. If you just want to set/replace the float etc. just take the fuel feed and tops off here's the manual settings also check for this type of carb filter it might be plugged.
  7. merc850

    Help Identifying Merc power Tilt and Trim

    Re: Help Identifying Merc power Tilt and Trim Yes that's one of two trim rams this is what they look like installed, I notice that you have the hoses so you're almost there. Any Merc dealers in your area that have a bone yard - good place to get parts. Here's the wiring diagram if you want to...
  8. merc850

    65Hp outboard spraying gas

    Re: 65Hp outboard spraying gas It sounds like the floats are stuck to the bottom of the bowl or are fuel soaked and sinking, the best way to solve this problem is to take the tops off and check their condition.
  9. merc850

    What to use for stator insulation?

    Re: What to use for stator insulation? I found what I think is the stator but it has some fixable damage, check out the dimensions
  10. merc850

    1969 merc 500 ignition issues? might sound familliar?

    Re: 1969 merc 500 ignition issues? might sound familliar? Carb float setting Lube intervals
  11. merc850

    1969 merc 500 ignition issues? might sound familliar?

    Re: 1969 merc 500 ignition issues? might sound familliar? Here are the specs and the wiring diagram for Lightning energized motors and the test procedure and values.
  12. merc850

    1969 merc 500 ignition issues? might sound familliar?

    Re: 1969 merc 500 ignition issues? might sound familliar? The rectifier on that engine is only part of the charging circuit it doesn't run the ignition, have you checked the cap and rotor for corrosion/water etc? If you remove the cap don't try to remove rotor from shaft it's molded on. You can...
  13. merc850

    Need help with mercury 20hp serial#/remote setup

    Re: Need help with mercury 20hp serial#/remote setup If it is a 1975 this is the type of control box of that era, there are white ones too on ebay if you don't mind painting.My 1975 manual lists the kit as A-46455A3 so it will probably work.
  14. merc850

    Adding fluid to tilt/trim on a '77 Mercury 850

    Re: Adding fluid to tilt/trim on a '77 Mercury 850 In this photo you can see the large fill hole and the vent and the manual says 5W-20 oil.
  15. merc850

    Mercury 50 exhaust stack plugged?

    Re: Mercury 50 exhaust stack plugged? Here are 2 pages from the 1975 manual that should help. I can't tell from the photos but the diagram shows that the exhaust tube bolts onto a stub from the powerhead, I would just look up the tube and see if there is a blockage before tearing it apart...
  16. merc850

    Do carbed motors need a thermastat?

    Re: Do carbed motors need a thermastat? Here's a page from an article about the first 100 h.p. that explains heat transfer in an inline Merc.
  17. merc850

    1978 Merc 800 Shift Cam

    Re: 1978 Merc 800 Shift Cam If you want to do it right you'll need to remove the propshaft and bearing carrier then you can access the shift cam thru the FWD gear. This works best if the propshaft is horizontal: Remove the shiftshaft bushing and the shift shaft and pull it out, reach in and...
  18. merc850

    1977 t-bolt 850 bogs down after half throttle or above

    Re: 1977 t-bolt 850 bogs down after half throttle or above I had the "pump to go " problem and it was a clogged carb screen in this type of carb, I took them out and threw them away. I pay attention to what I put in my gas tank - unlike the POs!
  19. merc850

    tilt motor

    Re: tilt motor Here's the wiring - there's a plug that comes from the switch wiring harness that plugs into the red plug on the pump.
  20. merc850

    No spark on on '74 150hp. I'm new to Merc's...Help!!

    Re: No spark on on '74 150hp. I'm new to Merc's...Help!! Here's a diagram for wiring purposes - the distributor has contacts and a rotor, undo the bolt that clamps it to the housing to check for corrosion water etc. Do not try to remove rotor it is molded onto shaft! The ignition switch could...
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