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  1. merc850

    '79 50hp 4 cylinder. Lower unit oil seal

    Lower unit parts; you can check whether it's leaking by using the gear oil pump and pumping oil in.
  2. merc850

    Mercury Blue Stripe newb question

    Here's a page about the reverse lock
  3. merc850

    Can a bad trigger and/or rectifier cause...

    The flywheel will only install on the crank in one position but some people undo the bolts at the hub then reassemble it incorrectly (if your flywheel looks like one in image) - it happened to me, once! Check for paint damage around bolts.
  4. merc850

    1969 Mercury 650 - Odd Wiring and Solenoid Question

    Does that solenoid have a curved mounting bracket, if so it bolts to the starter case - if it has a flat base there should be 2 threaded cast bosses in the lower cowling; you can use this method for deciding what terminal goes where because there are 2 types. The "magneto analyzer" is a VOM.
  5. merc850

    85 hp 850 drawing power when off

    If you can run the motor hook a voltmeter on AC to the yellow wires and see if you get 13-16v output and as well hook up the voltmeter to the red post on the rectifier + and a ground and you should get a DC voltage 13-15v. Here's the method for checking rectifiers
  6. merc850

    85 hp 850 drawing power when off

    Since you didn't post the year here's a diagram that shows typical wiring, the ground is - with no + leads attached; the small yellow in this case is the solenoid start wire.
  7. merc850

    Question on a serial number of old Merc 500

    Before you start getting into the 50 hp check the distributor bearings by turning the pulley to see if the bearing(s) are seized (arrow) , if they are that's why the timing belt is missing; looking at the condition this motor is in it looks like the motor has been sitting outside without a...
  8. merc850

    1977 Merc 850 lower unit.

    The reverse lock cam is not properly aligned, are all the rev lock parts installed?
  9. merc850

    1977 Merc 850 lower unit.

    There's a guide tube (Nr. 35) for the watertube that has to be used to insert into the pump housing check the upper shift and lower splines to see that they aren't hitting - that happened to me when the upper SS twisted, and also it's easier to keep/find neutral with the control hooked up .
  10. merc850

    Engine oil leak at the lower unit

    According to the posted description this motor is a 4 stroke http://www.iboats.com/MERCURY-75-4-S...iew_id.1701882 and looking at the parts lists there is a dipstick that could be leaking engine oil or it could be leaking LU oil at the shiftshaft bushing; the best way to check this is to match...
  11. merc850

    Blue Band Mercury 850 Serial Number

    Here's a 1976 diagram, ADI no distributor
  12. merc850

    Blue Band Mercury 850 Serial Number

    Did you look here? and on the block near the fuel pump.
  13. merc850

    Mercury 500 Thunderbolt 50 HP Four 2 Stroke Serial Number?

    Just a note: in this image it looks like the - cable is touching the starter + terminal, it if it is I would move it farther away to eliminate the possibility of fire.
  14. merc850

    1973 Mercury 850 Shift Rod

    I think you'll have to remove the bearing carrier and the propshaft and reverse gear to access the cam; might as well put in a new one, maybe a Mercury dealer will will loosen the carrier nut (24) for you because there's a tool for that. The bearing carrier (20) may be seized into the housing so...
  15. merc850

    1956 Mark 25 Point setting.

    Here's a page from the owner's manual, set Nr.1 first then Nr. 2 at as close to 180* as you can get.
  16. merc850

    Intermediate and WOT issues with 850 4 cylinder....flooding?

    I bought a 75 850 and it needed a new ignition trigger, fuel pump, removal of the carb filters and a total re-timing the P.O. had taken the flywheel apart and put it together wrong, check for socket circles around the inner bolts that's a giveaway. It's possible that the carb filter screens are...
  17. merc850

    Mercury 7.5 HP Motor Refresh (1969 model year)

    I was just going by the picture at 7:25 and I didn't see Nr.19. It's no big deal if you leave the ext. fuel line connected.
  18. merc850

    Need wireing help

    Here's the diagram
  19. merc850

    Mercury 400 E Ignition Switch Wiring

    This might be the diagram you have if you can't work it out with a diagram use an Ohmmeter to check from switch to connector. The mercury switch is a safety device, if you hit something the shocks limit the motor's tilt, cushioning it on reentry and the switch cuts the power until the motor...
  20. merc850

    Shift-cam positions on 1975 850

    The shift shaft bushing has seals in it (Page 1) and you might as well replace it before you re-assemble.Also it's a good idea to follow these instructions:
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