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  1. M

    lower unit removal/when all else fails?

    850 lower unit will not come off. All nuts and bolt "have" been removed. Done the forward/reverse thing, wedges, 5lb hammer and block of wood. Two of the nuts closest to shaft can also be used to help push down lower unit by putting 1/8th inch metal plate above them and winding them off against...
  2. M

    What size prop?

    I have a Merc850 its going on a 16' fiber glass half cabin. Will be used in river for fishing, up to 4 adults 2 kids. Need help on prop size. Found a site that suggested 13/17, 13/19 and 13/21. I don't know WOT. Also are 2 blades ok, and are brass props any good? Thanks Dave
  3. M

    conrod bearings?

    Posted this in another thread, appears to have slipped through the net unnoticed, so I'll try again. I have seen a method used on rotax engines where a dial indicator is inserted in plug hole to measure piston travel. Crank is set to TDC and a pump is used to create a pressure or vacuum above...
  4. M

    How can I check gearbox.

    Hi all. Just picked up a Merc 850 XS, approx '76-78 as far as I can make out. The motor is running and pumps water but has no prop. The gearbox lever seems to shift ok. When lever is at one end the prop shaft will not turn in either direction. When centered there is a neutral, prop shaft turns...
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