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  1. M

    shifter/throttle question

    i have a 75hp, 1985, 4 cyl merc ob mtr. while running it today i could hear a "humming" sound coming from the gear shifter/throttle. any ideas, thoughts? mike
  2. M

    mid- throttle question

    mind boggling.... my 75hp, 1985 ob merc idles fine and runs at full throttle fine. when you are just above idle and mid throttle it skips, seems to cut out on 1-2 of the cylinders. throttle up it's fine. it's a 4 cyl... anybody.... any thoughts?? thanks, mike
  3. M

    water pump discharge

    i have a 1985, 75hp merc ob mtr. does it discharge water from the water pump after cvooling the engine from both the port and starboard sides of the motor? i thought it did but while crusing yesterday i only saw one discharge point? thanks, mike
  4. M

    tilt & trim lube question

    I have a 1985, 75hp merc ob mtr. i can't locate where to add fluid to the tilt & trim. Can anyone lead me in the right direction? thanks, Mike
  5. M

    Steering question.. new boat (to me)

    i have a 20' proline, with a 75hp merc ob motor. i was just in the boat, turned the wheel and the engine wdn't turn. does the mtr have to be running for the the steering to engage/work? :confused: thanks in advance
  6. M

    Steering Question???

    I HAVE A 20" FOOT PROLINE BOAT, 75HP OB MERC. WILL THE STEERING OPERATE WITHOUT THE MOTOR RUNNING?? I WAS JUST IN THE BOAT, ON THE TRLR, AND TURNED THE WHEEL..... THE MTR WD NOT TURN.. DOES IT HAVE TO BE RUNNING?? :confused:
  7. M

    lower unit on merc lube help

    1985, 75hp, 4cyl, ob merc motor. both the vent screw and the fill screw on the lower unit are worn and i am unable to remove without completely stripping the heads of the screws. any thoughts?? suggestions on how i can remove without breaking something else?? thanks mike
  8. M

    short term electrical help

    the wiring in my newly purchased boat is a mess.. i am wondering short term can i run the fish/depth finder directly to the battery that starts the motor? it's a 75hp merc, 1985. it's hooked directly to the battery.... nothing else hooked up to anything.. thanks
  9. M

    1985 merc ob 75hp 4 cyl lower unit question

    hello... i have a 1985, 75hp merc ob motor. i just noticed it has a small crack in the lower unit, just above where the propellor is. it is about 2 inches long. it pumps wtr fine... what do i need to do to repair or check out to see what i need to do? thanks mike
  10. M

    75hp ob merc 1985 4 cylinder

    i have a 1985, 75hp ob merc motor. it is a 4 cylinder. what is the correct ratio for mixing ob mtr oil with the gas? is it 1 pint of 2 cylcle oil per 6 gallons of gas?? thank you, Mike
  11. M

    lubing merc 1985 75hp ob

    i have a 1985, 75 hp merc ob. i want to make sure the lower end is lubed. i see a scew that says vent,but no place to add lubricant.. what am i missing? thanks, mike
  12. M

    electrical help needed by all thumbs boater

    just boat an older boat and motor. 20' proline, 75hp ob merc mtr. battery cables out of mtr go direct to batt so it starts and tilts. nothing elese is connected. it has lights, fish finder, radio and a cpl of gauges. fuse box, etc. nothing but the mtr is hooked to battery.. any thoughts...
  13. M

    merc ob year??

    hello... i have a merc ob mtr, 75hp, 4 cyl, ser# A115920 can anybody tell me the year?? anything else about them as far as reliability? thanks in advance
  14. M

    replacing port side manifold mercrusier 160, 1989

    can anyone tell me how difficult and expensive it wd be to replace a port side manifold that has cracked on an i/o mercrusier 160hp, 1989?
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