2019年5月31日 · Lower unit is coming off no matter what. :) Replacing the tube is not that hard once the L/U is off. Depends on the specific motor of course. Many older motors would see the tube come out with the L/U rather than remaining with the motor. I would not try to patch it. Don't want it "letting go" at an inopportune time which can strand you or worse...

2010年7月5日 · Re: Mercury 20 HP Back pressure when filling lower unit. I don't think the flush port is the oil vent. It's for flushing fresh water through the motor I think. Look around for the vent plug.

2003年9月1日 · I was looking for the classic fill/vent hole setup, but the only thing I found as far as anything outside of a solid gear housing were those two holes. Is it true that old Merc models, or at least older Merc 110 models, have much smaller vent/fill holes? What is used to propel gear lube into the small fill hole?

Gear Lube Drain screw with gasket for most Mercury lower units. (Also used as vent screw in 1963 and newer 35HP and larger non-racing gear cases.) This is used as both drain & vent on …

Mercury lower unit parts to fit most older Mercury outboard motors are found on this page. lower unit seal kits, and other related parts. See our other pages for more Mercury, Johnson and Evinrude outboard motor parts. Email us for information on used outboard parts.

2016年11月15日 · The fill machine screw is on the port (tiller handle side) on the lower front of the "bullet" portion of the lower unit. The smaller vent machine screw is on the opposite side, but higher up, a little below the anti-ventilation plate underside.

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Mercury makes a neat little fill-pump which fits into the quart sized bottles of gear lube. This pump works well to fill the lowerunit from the bottom up. Remove the vent and drain screws and let the unit fully drain. We like to pump a little clean lube into the top vent hole to flush out the housing.

2009年12月20日 · This is my install for the 3.0L SportMaster Lower Unit Vent Kit. This kit was designed to keep your seals from blowing out when your gear case lube heats up and needs to expand. The lube is forced up a tube and into a sealed container located in you cowl. Kit is available from LakeLand Marine in Lake Havasu AZ. (928) 453-1155.

I am assuming you mean the vent in the lower unit and mean gear oil?Take the bottom drain screw loose on the lower unit. Drain about a teaspoon of gear oil out then tighten the plug.