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  1. merc850

    1980 mercury power tilt and trim issues / new to boating

    Re: 1980 mercury power tilt and trim issues / new to boating You can tighten the hose connections with a wrench (a line wrench is best) be careful 'cause stainless steel is soft, I would drain the oil by undoing the bleed screws and pumping it dry then replace the oil by filling it into the...
  2. merc850

    50hp merc power t/t question

    Re: 50hp merc power t/t question I would like to see this winch idea please post a picture! The first thing you need is a tachometer to find out what RPM your motor is turning at, then you can choose a prop that puts you at 5500 rpm full throttle (possibly a 19 pitch one), also, you should be...
  3. merc850

    Preparing boat for the summer...

    Re: Preparing boat for the summer... You should follow this lube chart and grease the driveshaft and shift shaft splines.
  4. merc850

    1974 mercury 115 has issues need help please

    Re: 1974 mercury 115 has issues need help please When you start it do you raise the fast idle lever(little one on side of control) pump the bulb until it's hard and hold down the choke? If the starter is too slow it might need to be taken apart and cleaned and new brushes installed if needed...
  5. merc850

    What can you tell me about this 850? Tilt and trim?

    Re: What can you tell me about this 850? Tilt and trim? 1st picture shows the trim limit wires are cut; you're gonna need this diagram to rewire engine. For TNT you need the four hose pump and 4 hoses and switches, look on ebay. Throw those spark plugs out and replace them with L76V I'd also...
  6. merc850

    1964 merc lower unit

    Re: 1964 merc lower unit Here's how it is built first you should soak the perimeter of the nut with penetrating fluid and bend the tab on the locking ring, you need a spanner that engages the lock nut and turn it off. Maybe you should ask a dealer to unscrew the lock nut. The bearing carrier...
  7. merc850

    manual choke 1975 merc 850

    Re: manual choke 1975 merc 850 The manual parts are in the square.
  8. merc850

    Tilt/Trim not working after reinstalling outboard motor

    Re: Tilt/Trim not working after reinstalling outboard motor To do a complete job on the bleeding, you can find lines on ebay.
  9. merc850

    Dockbuster Question

    Re: Dockbuster Question Here's my 1961 Merc 700 DR in the 90's I was given this motor and some spare parts by a friend. All it needed was a gearcase retainer nut ($45.00) and it hauled a** around 40mph and started easily. I ran it at 100:1 Amsoil mix for about 10 seasons until I decided to...
  10. merc850

    How to Revive a 1958 Merc Mark 78 Super Marathon?

    Re: How to Revive a 1958 Merc Mark 78 Super Marathon? The Dyna float is the motor to swivel bracket mounting made of rubber. One thing I'd do is replace the timing belt that comes out from under the flywheel - to do this remove the distributor belt cover first then slide the belt up off the...
  11. merc850

    1975 Mercury 850...

    Re: 1975 Mercury 850... I have an 850 too and I found crap in the lower carb filter.I took out the filters because there's one after the fuel pump and in the tank to filter the fuel.
  12. merc850

    Inline 6 Exhaust Tube Installation

    Re: Inline 6 Exhaust Tube Installation Here's a cut open view of the whole engine and the housing page from the manual, the exhaust tube should bolt to the plate and go into a gasket in the LU
  13. merc850

    1972 Mercury 1400 140 hp outboard motor won't start after towing it home

    Re: 1972 Mercury 1400 140 hp outboard motor won't start after towing it home This is the 1972 control box, no kill switch unless PO put one in - no spark means electronics not workingthis diagram is similar except for tach wiring, 12v+ power on red and white on switchbox, the trigger test is...
  14. merc850

    Is my tension spring pin wrong relative to economizer collar?

    Re: Is my tension spring pin wrong relative to economizer collar? Here's an 850 model pic from the manual.
  15. merc850

    Fuel mixing

    Here's a page from the 1975 Manual about fuel/oil (the gray section). This is an important procedure if you just pour the oil into the tank it goes to the bottom, for awhile the motor smokes and runs crappily - when the tank is getting empty the oil has been used up and the gas now contains a...
  16. merc850

    Tilting the tower of power

    Re: Tilting the tower of power The power trim cylinders are the same for all HPs only the pump is different. I am aware of 2 sizes of piston 3/4" and 1" I would ask seller what size the piston rod is before buying. If you install the whole system you will have trim and tilt which means you can...
  17. merc850

    Just Got first boat; Shift Shaft Question

    Re: Just Got first boat; Shift Shaft Question Here are 2 views of the guts of the LU - in pic 2 item 2 is the shift cam, in pic.1 item 44 is the shaft that rotates the cam.Any external pieces on the shaft are for the reverse lock, try turning the shaft CCW for a few degrees and see if it will...
  18. merc850

    1971 Mercury 50HP 4 Cylinder

    Re: 1971 Mercury 50HP 4 Cylinder The Mariner has the trim pump and all the hoses (4), the trim cylinders replace the shocks on your 1971 Merc . Mariner is a Mercury with a different color paint so all the parts are there but to be safe buy the other Merc with PT.Here are 2 manual pages for...
  19. merc850

    1987 Mercury Classic firty Reverse issues (please help me)

    Re: 1987 Mercury Classic firty Reverse issues (please help me) It is spring loaded to shift into FWD without pressure on the cable, neutral has pressure and reverse has the most If you turn the prop while the cable is off it should ratchet to the right when in FWD. Here's my way of...
  20. merc850

    Need trim bleed procedure for 1970 Mercury Thunderbolt 1350

    Re: Need trim bleed procedure for 1970 Mercury Thunderbolt 1350 I use the grade of oil that is on the pump sticker.
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