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  1. M

    Merc 20hp Backlash measurement

    Ive read the thread moody blue did 2010, and Ive got the general idea, but got a few questions about mine. Ive reassembled the Fwd gear & pionion gear & torqued it up. Ive got a dial indicator & bolted it on top of the lower unit & clamped a piece of metal onto the drive shaft (Impeller key...
  2. M

    Merc 200 20hp Lower Unit Re-assembly problem.

    I have two lower units off Merc 20hp's. The case numbers are 1627 6006 & 1627 4404. Q. What if any is the difference in the case numbers. Q. Im having trouble seeting the forward gear in the case. Is there a difference in the bore sizes used in the cases, or should they be totaly...
  3. M

    Merc Harnees

    I have an Merc wiring harness (Ignition, Tacho choke etc ) and the starter cables which I need to replace. Is the connector into the outboard a factory sealed unit as it looks, or can you open it, and how?. Part number on connector is Mercury 45876, looks like a snakes head, its got two...
  4. M

    Alunium Brazing Stuff

    I found a product HTS 2000 on the net. Makers claim it can join, fill etc aluminium boat stuff, even cast aluminium. Has anybody heard of this stuff and used it. Is it as good as they say? or something to stay clear of. Lots of bogus stuff and sites out there if you know what I mean.
  5. M

    Helllp, Helllllp

    Ive got ( At least I think I have) an LU for a 20hp Merc. Im trying to get the cover nut off. Ive drilled it and broke a bit out. but it looks like its in one piece. Part No 72695 or 72685. Is it a cover nut or is the cover nut and bearing carrier in one piece? I say that cause the bearing...
  6. M

    Gears back lash

    Got a Merc 20hp gearbox. nead to measure the backlash of the gears ?. I know theres a tool but how do you aplly it and use it. Should I bother with shimming and backlash or just chuck it back together and hope for the best.
  7. M

    Merc 200 20hp Drive shaft change

    Ive just got a 2nd hand lower unit for my merc 200 T/bolt 20hp. Problem is the drive shaft end (crank) is a square end my original one was a spline end. I know Mercury changed the drive ends but from what to what and when. I was told the unit was newer than my 1973 but ive a sneaky sus that its...
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