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  1. I

    OMC 2.5L milky oil after short time

    Found one potential source of water ingress. Took the manifold off and the intake runners are rusted to hell. Boat sat outside uncovered for who knows how long, seems a lot got in through the carb. Also noticed somebody had done a hokey weld job on the underside of the manifold. Pressure test...
  2. I

    OMC 2.5L milky oil after short time

    Also, looking at the oil on the dipstick again, I noticed it's pretty thin and smells strongly of fuel. I'm starting to wonder if maybe there was just a little bit of water from storage to make it milky but the fuel is what raised the level so much. Any ideas on how to diagnose that issue? I've...
  3. I

    OMC 2.5L milky oil after short time

    Have my pressure test rig hooked up. So far it's holding solid... had a slight leak through my adapters, once i sealed those up the needle isn't moving. I'll check it again over a period of time and see if it holds. Does this mean my block might be good? or that it needs heat to open up?
  4. I

    OMC 2.5L milky oil after short time

    Dang. And we’re talking the shaft in the lower with the pinion gear on it? Or is this the shaft in the upper housing with the water pump? Haven't opened up the upper yet.
  5. I

    OMC 2.5L milky oil after short time

    Thanks for all the info. I’ve purchased seals for the lower (it was also freeze cracked at the very tip of the nose... had it welded up), and ball gears/impeller are on the list. I’ve already purchased a replacement used vertical driveshaft due to the original being pitted on the bearing...
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    OMC 2.5L milky oil after short time

    Well... this is painful. I recently picked up for $200 a 16' 1980 SeaSwirl with an OMC 400 stringer drive, 2.5L 120HP engine. All the wooden motor mounts/stringers/etc were rotten out, I have another thread talking about repairing all of that. (Should've quit while I was ahead and not started...
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    Stern drive/inboard engine - sealing transom ring

    I haven’t drilled the holes yet - the plywood is still untouched and the old holes in the glass are mostly filled with epoxy from glueing the transom in. Just trying to plan ahead.
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    Stern drive/inboard engine - sealing transom ring

    I've just installed a new transom core in my old Seaswirl, which has an OMC 400 stern drive in it. I've been doing lots of research and haven't come to anything conclusive. The seal ring has some 20-odd screws that attach it to the transom - I'm trying to figure out how to seal up all those...
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    1981 Seaswirl 16' stringer repair

    The originals were glassed in without any bedding at all so I was thinking this would at least be better than that. The bulkheads were sitting on top of the flotation foam they used to fill the cavities and allowed to weep underneath.
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    1981 Seaswirl 16' stringer repair

    And the fuel tank is up at the front of the boat on top of the deck, behind a (removed) kick plate under the dash. You can barely see the edge of it in that picture, just ahead of the most forward cut in the deck - it's angled sideways right now (needed access to make a cut to get out one of the...
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    1981 Seaswirl 16' stringer repair

    Would the 3 layers of 6oz cloth have CSM between each layer? Or just one on top of the next? As far as the “extra” stringers, that’s how the boat was originally built. I want to say they are just to support the floor and that the all-glass stringers are the real stringers, but I didn’t design...
  12. I

    1981 Seaswirl 16' stringer repair

    I recently picked up this POS for $200, not realizing how much work it would be to get it up and going. Motor mount beds and stringers are all totally rotted out - to this point I've pulled out all the rot, built new stringers & mounts and have started tabbing it in. The boat has two foam-filled...
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