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  1. merc850

    Which ignition do I have? 1968 mercury 500

    My best guess without seeing pictures is the Lightning energizer type with a large red coil, this is electronic ignition no points, but there is a timing belt under the flywheel that might need replacing.
  2. merc850

    Tilt/Trim Motor stator field coil windings connections

    Here's the wiring diagram that should help, the solenoid changes the current flow
  3. merc850

    i need a wiring diagram for a 1977 85hp merc tilt and trim

    Here you go
  4. merc850

    1969 merc1000ss coil specs

    This is how the trigger works in the breakerless Tbolt ignition. Your problem might be with the trigger or you might have the early version with points, can you post a picture of the distributor?
  5. merc850

    Help with old Mercury tach wiring.

    The tach says Mercruiser and it only goes to 5000 rpm so I don't think it's for your motor - it's for a 4 cycle sterndrive. I would buy a new alternator driven tach and you can still use your control harness plug if you make a change in the wiring (see diagram) move the brown wire to a terminal...
  6. merc850

    Issue with power tilt/trim question for 78 Mercury 800...first time boat owner

    Have you bled the system? also take the lower mount bushings and out and grease them and check to see that the tilt bracket is moving freely. I think there are grease fittings on it too.
  7. merc850

    h20 pump maybe?

    If you are on "muffs" in driveway water should be coming out of the prop and the vents above the anti-cavitation plate, if it is then your tell tale tube is plugged or not attached. The water tube might also not be in the pump housing there is a small guide tube that helps align the two. Nr.35...
  8. merc850

    Mercury 85 Thunderbolt wiring

    I think you have a 1976 ADI 850 if so here's the wiring diagram
  9. merc850

    1974 mercury 115 question

    Pump view
  10. merc850

    1974 mercury 115 question

    See NOTE below: I use a LU gearcase fluid pump to fill pump because the fitting screws into the FILL hole.
  11. merc850

    1973 Mercury 650 head gasket

    Here's the tork sequence @70in./lbs.
  12. merc850

    1965 Mercury 900 90 hp no spark

    That's the side inlet for spark the cap looks really good - like low hours. maybe you can find one on ebay or if you are really lucky a Mercury dealer, I might have one. Watch out for the rotor! Did you do any of the tests I suggested?
  13. merc850

    1965 Mercury 900 90 hp no spark

    Make sure you take the red spark side terminal off first! The rotor is usually held on with Loctite and can be difficult to remove. Check that you are getting + voltage on the coils and the resistors, disconnect the mercury switch, turn engine over and check for spark, put a tester on each...
  14. merc850

    New old Power of Tower 6 cal 90HP

    Well I would do a compression check;120+ psi; then move on to changing the gear lube - check for milky appearance and/or water, (undo the lower and air vent screws in the gearcase, let it drain then fill from the bottom up with engine in vertical position) refill with Marine gear lube only...
  15. merc850

    Mercury 850 cowl seal

    Here's the breakdown, you'll need the two gaskets and remove the 7 bolts (Nr. 10) to remove the seal.
  16. merc850

    Simple Method Of Shift Shaft Setup For Mercury Outboards Verified

    This is how I do it in about 60 sec.: Turn the LU shift shaft by hand counter-clockwise until it stops, then with Vise Grips tight on the bottom of the shaft turn it a few more degrees CCW until it clicks into a stop, this should be neutral - check by turning propshaft -- prop should spin...
  17. merc850

    Mercury 4.5 Iron Seahorse Spark Issue

    Here's the wiring diagram, I think that the capacitor is charged/discharged to energize the coil. Check the back of the coil for a ground wire.
  18. merc850

    1967 Mercury Thunderbolt 950 SS stuck in Forward

    Reverse lock
  19. merc850

    1967 Mercury 950 SS, electrical question

    Here's a wiring diagram of a Thunderbolt breakerless ignition, if your switch box has 3 posts for the trigger then it should work: however the TB rotor is molded on to the shaft so you will replace the whole distributor adapter assembly.
  20. merc850

    '77 Merc 850 power trim issue

    If it's the external pump 2 shocks kind try this: Put some Loctite blue on the plugs when you reinstall them.
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