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  1. 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...
  2. merc850

    Blue Band Mercury 850 Serial Number

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

    Blue Band Mercury 850 Serial Number

    Did you look here? and on the block near the fuel pump.
  4. 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.
  5. 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...
  6. 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.
  7. 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...
  8. 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.
  9. merc850

    Need wireing help

    Here's the diagram
  10. 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...
  11. 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:
  12. merc850

    MerChristmas

    Found some lites to brighten up my motors.
  13. merc850

    Shift-cam positions on 1975 850

    Been there, this is right from the manual
  14. merc850

    Perking Up A 1965 90hp 6 cyl

    Do you have the points disk for setting the point phasing? It's important. If you have a tach you can find the right prop to give you 4800-5200 rpm.
  15. merc850

    weird socket to tighten lower unit prop shaft carrier

    It looks like this, $80 from dealer
  16. merc850

    late 60s Mercury 1250 125hp timing issue?

    There are 2 bearings in that assembly that have gone bad; the exploded view shows them These instructions tell how to remove the shaft but you must 1: Not to try to remove the rotor it's molded on 2: Be very careful when removing the disk or you can break the trigger coil off the housing (the...
  17. merc850

    1975 Thunderbolt test

    If you're a fan of CD Thunderbolt ignition like I am you have to see my bench test of a restored 4 cyl. unit. Here's a link http://anythingondvd.net/contact6.html
  18. merc850

    '84 Mercury 115 inline six, Long to short mid unit swap question

    I have a 1960 Merc 700 dockbuster and it pulled tubes/other boats/skiers etc.; ran it for hours and 15 years and didn't "bust" any docks - of course I know how to operate a boat, used a good battery and changed spark plugs once in a while! It was retired running 6 yrs.ago and it now sits in my...
  19. merc850

    '84 Mercury 115 inline six, Long to short mid unit swap question

    Here's a diagram for the single cable that shows how the switches are wired there are 2 positions in each start mode; push the button straight down to activate the starter and forward and down to activate the choke and starter. That box is a collector's item for old Merc guys.
  20. merc850

    Mercury 500 Thunderbolt - Sat for a very long time.

    Since the battery only operates the starter you just use a charger (solar or A.C.) once in a while to keep the battery up. You are going to have to replace the tilt tube to use a rack and pinion steering system. I think you should remove the powerhead and check the upper shift shaft for...
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