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  1. 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
  2. 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...
  3. 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.
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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.
  10. merc850

    No spark now..

    Re: No spark now.. If you have the non-Thunderbolt ignition (like you said 2 coils) it has 2 sets of points in the distributor these are the important documents for repairing it. Check the voltage at the coil + side; +- 9.5v with switch on, 12+ v while starting.
  11. merc850

    Any tips on pulling a powerhead off?

    Re: Any tips on pulling a powerhead off? The gasket is probably holding it together. I had to do the same thing and to get it off I lightly hammered an eating knife ('cause I didn't have a gasket scraper) into the gasket all the way around while pulling up on the powerhead, the gasket is...
  12. merc850

    1971 Mercury 800 80hp Switchbox...

    Re: 1971 Mercury 800 80hp Switchbox... That top pic looks like a rectifier for the charging circuit I would test the trigger first here's a wiring diagram.
  13. merc850

    Spark plug question for 76 Mercury 1150

    Re: Spark plug question for 76 Mercury 1150 This is how it was introduced in 1966 they went to Perma-Gap plugs later.
  14. merc850

    Removing crank bearings from inline 6?

    Re: Removing crank bearings from inline 6? For everyone who doesn't have the manual I think the con-rod in the last picture is bad.
  15. merc850

    76 Mercury 1150 Odd Starting, and starting battery vs deep cycle

    Re: 76 Mercury 1150 Odd Starting, and starting battery vs deep cycle A regular cycle marine starting battery is all that's needed, use a voltmeter to check the battery voltage while cranking engine - it should read + 12v.
  16. merc850

    Re Re sealing merc 500 lower unti

    Re: Re Re sealing merc 500 lower unti procedure; torque for bearing carr. nut - 110 ftlbs. tool for bear. carr.
  17. merc850

    New to me boat-1965 650E 65hp Need some help :(

    Re: New to me boat-1965 650E 65hp Need some help :( There's a screw at the bottom of the LU, remove this screw and the VENT one to drain the oil which should be waterfree no milky color - to replace the lube buy a pump, a quart of gear oil and screw washers from a Mercury dealer. You thread...
  18. merc850

    trim pump help

    Re: trim pump help If it doesn't work anyway why not take it apart and find out why? I got one last summer that was seized from water intrusion, took it apart and cleaned it and now it works.
  19. merc850

    PT&T Question

    Re: PT&T Question You screw the large hoses into the large holes and the small ones into the small holes then bleed the system, flush all the old fluid out. If it leaks at the fittings the threads might be dirty or they are not tight enough. If the hoses have lost their rubber coating and the...
  20. merc850

    PT&T Question

    Re: PT&T Question You screw the large hose into the large hole and the small one into the small hole then bleed the system
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