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  1. merc850

    Will 1970 Merc 500 run without the rectifier?

    Re: Will 1970 Merc 500 run without the rectifier? Yes you can pull start it but you'll still need a battery, and when the battery runs down you risk damaging the ignition components and stranding yourself somewhere. Here's how to save the stator from destruction your wires will have terminal...
  2. merc850

    Mercury 850 (85hp) bogs out of hole and shuts off!

    Re: Mercury 850 (85hp) bogs out of hole and shuts off! What year is this motor, here is my 1975 850 timing decal it sounds like the primary throttle pickup is not adjusted to between 3-5*.
  3. merc850

    Repairing a Merc starter, what's all to it?

    Re: Repairing a Merc starter, what's all to it? Here's an exploded view from the manual and the second page shows the tool for installing the brushes, I made one out of an old CD drive case - works great
  4. merc850

    Help Please I am out of Ideas

    Re: Help Please I am out of Ideas Here's the strainer type fuel bowl covers I had a lower carb filter full of "fur" and so I removed the screens, runs perfectly now.
  5. merc850

    1975 Mercury 850 85 hp Thunderbolt

    Re: 1975 Mercury 850 85 hp Thunderbolt I have an 850 too and the choke is a button on top of the MerControl box, here's the wiring diagram.
  6. merc850

    Old Merc Lower Unit seals??

    Re: Old Merc Lower Unit seals?? It sounds like the driveshaft seal or the Oring in the waterpump base; this is similar to yours , first you take the slinger off then undo the bolts that hold the cover on then pull the cover off and pull the impeller off the driveshaft. Gently pry the base up...
  7. merc850

    71 Thunderbolt 800 Tilt & Trim rewire Question

    Re: 71 Thunderbolt 800 Tilt & Trim rewire Question That is the tilt limit switch yes you can open the cover and rewire it here's the wiring diagram there should be a stainless steel clip on the trim cylinder that you can adjust to limit the trim but I don't see it in your photo. I would clean...
  8. merc850

    Mercury 500 Thunderbolt 1970 50 hp gear case NO OIL

    Re: Mercury 500 Thunderbolt 1970 50 hp gear case NO OIL Here are the lower unit diagrams you should try to find a dealer that will undo the bearing carrier nut (2nd diagram Nr. 24) and pulling the bearing carrier may require heating and penetrating oil.
  9. merc850

    1967 Mercury 950ss - no neutral or reverse

    Re: 1967 Mercury 950ss - no neutral or reverse This is the type that that motor uses disconnect the shift cable from the motor then move the handle from forward to reverse, the plastic end should move about 4" if it does then you probably have it misinstalled. Set the handle at N and move the...
  10. merc850

    What is float level on 1bbl carbs on Merc blue 850 or 85hp

    Re: What is float level on 1bbl carbs on Merc blue 850 or 85hp Here's the method watch that float spring height
  11. merc850

    73 Merc 850 Carb removal

    Re: 73 Merc 850 Carb removal Coil wire unscrews from cap, pulls from coil - slide the boot off the coil end then pull with pliers close to coil. I think you have to pull starter so make sure the harness plug is disconnected. Check your carbs if they look like this undo the fuel line and check...
  12. merc850

    Mercury 850 Water pump Impeller

    Re: Mercury 850 Water pump Impeller Here's the diagram: the Oring goes on the pump base and the tube goes onto the water tube and into the pump top.
  13. merc850

    Mercury 500 advice needed please

    Re: Mercury 500 advice needed please Have you done a compression test? The lo speed needles should be 1 1/4 turns out from seated to start, then adjusted to run properly under load. Tilt the motor all the way up and squeeze primer bulb until fuel flows out of carbs, this will show if you have...
  14. merc850

    Mercury 1150 rpm problems

    Re: Mercury 1150 rpm problems Check the carbs if you have this type check the filter screens
  15. merc850

    Early seventies Mercury 1250 Wont Start

    Re: Early seventies Mercury 1250 Wont Start No they were ahead by 2 years
  16. merc850

    1979 402 40hp not cooperating...again

    Re: 1979 402 40hp not cooperating...again If your carb is this type which I think it is then you should check the filters Here is the lever setup procedure
  17. merc850

    Water pump working...still no water...68 Merc 500

    Re: Water pump working...still no water...68 Merc 500 Here's an xray of a Mercury close to your year I would call a local dealer and see if the exhaust plate-powerhead gaskets are available, then pull the powerhead off and find out what's going on.
  18. merc850

    Newly acquired 1975 Mercury 850 85 HP outboard

    Re: Newly acquired 1975 Mercury 850 85 HP outboard I have the same engine and if all the wiring is good and no spark it is probably the trigger. If you are going to do a comp test you might as well check for spark at the same time.To check for spark ground all plugs and spin engine over. Here's...
  19. merc850

    Refitting lower unit Mariner 60-what grease is best for spline to stop binding up?

    Re: Refitting lower unit Mariner 60-what grease is best for spline to stop binding up Mercury makes an anti-corrosion grease that will prevent the salt water corrosion and sticks like glue - here's a guide to keeping that motor free moving
  20. merc850

    Tower of Power with stalling when put into gear.

    Re: Tower of Power with stalling when put into gear. If you have these carbs there is a filter in the top that can get plugged and cause that kind of problem.
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