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  1. J

    Mercruiser 3.0 Exhaust Riser Leak / Compatibility?

    Actually, in hindsight, I think I was talking about the riser not the elbow? (EDIT: INCORRECT, again, see below.) Also, looking up the parts numbers, I see a C1 stamped 42673 with 4 riser studs. So... still not certain that's what I think it is, but should know shortly and will update this...
  2. J

    Mercruiser 3.0 Exhaust Riser Leak / Compatibility?

    Thanks man!
  3. J

    Mercruiser 3.0 Exhaust Riser Leak / Compatibility?

    Yep. I bought the LX manifold. This was last year, before I understood this exhaust system. The previous owner had plumbed the exhaust with a newer offset elbow (thanks for the correction), and what I thought was sewer pipe. I just matched his part number. Took a grinder to the "sewer pipe"...
  4. J

    Mercruiser 3.0 Exhaust Riser Leak / Compatibility?

    Thanks fellas! 1. That is the stock boot for the old style exhaust riser. Plumbing parts were removed, and not pictured. That bit is not cobbled, and it's not leaking either. 2. To my knowledge I used the proper gasket, do you have part number? This is more what I was wondering. 3. The...
  5. J

    Mercruiser 3.0 Exhaust Riser Leak / Compatibility?

    Just bumping this post. Guessing the number of folks working with an MC1 - 3.0LX combo is small, but here's hoping someone has some wisdom on the matter.
  6. J

    Mercruiser 3.0 Exhaust Riser Leak / Compatibility?

    Hello again, Got my notor running, but have an exhaust leak issue. Have Sierra 18-1966-1 manifold, and sierra 18-1971 riser. This is a 3.0 LX motor, with a MC1 outdrive. Previous owner used the newer riser, and some cast iron sewer pipe to get down to the exhaust out on transom plate (j pipe...
  7. J

    MC-1 Transom Mount Switch ID.

    Haha! Yeah, I can't bare putting the old ones back on, and haven't picked up some new wires yet. Still working on getting the engine aligned, and the drive back on, so not biggest priority. I run two small business, and starting a third, so I'm a bit of a tortoise on this project. Really happy...
  8. J

    MC-1 Transom Mount Switch ID.

    Ha, yeah! That was one of the many issues I fixed from PO(s). I'd guess they thing they want to "see" the filter for some reason. Those are actually the same motor (block). The blue one is a full year's worth of days off, more wire wheels than I care to count, more than a few trips to the...
  9. J

    MC-1 Transom Mount Switch ID.

    Thanks buddy. How y'all like this makeover?
  10. J

    MC-1 Transom Mount Switch ID.

    Hello, about to drop my 3.0LX back in the boat this afternoon. I realized I can't remember which switch does what on the transom. Anybody got an answer? Guessing neutral safety and shift cutout. Any idea which is which?
  11. J

    MC-1 Exhaust Flapper.

    I was just coming to that conclusion myself. Just my luck that last season when I was in a hustle to see the thing float, I replaced the old riser with a brand spankin' new one when I put on a new manifold..... matched to what was on the motor of course. That's a very expensive crab pot...
  12. J

    MC-1 Exhaust Flapper.

    I couldn't tell you for sure, this is the one and only mercruiser I've worked on, but I'd guess that to be the case. Its a Mercruiser 3.0 LX engine with an MC-1 outdrive, in a 1973 Glasply 19.5 so I'm guessing that required a bit of creativity? Last owner was a...."mechanic".... who used things...
  13. J

    MC-1 Exhaust Flapper.

    I have looked through the stickies section on Flappers, and searched the forum, I'm just not seeing anything definitive about this particular exhaust setup. I'm sure its there, apologies for redundancy. I replaced the riser elbow last year with a new Manifold, and didn't see any flapper in the...
  14. J

    MC-1 Exhaust Flapper.

    Greetings, I've got my 3.0 in the garage this winter, just finished a total rebuild and wanting to be ready to roll come Halibut season. This has been a year long project, so forgive the mess in the bilge. Just getting things done as I can, and I haven't been back inside the boat since I...
  15. J

    Mercruiser 3.0 oil pan gasket

    Exhibit A: https://www.summitracing.com/parts/fel-17952/make/chevrolet Looks like a moot question on the automotive gasket. Ain't much cheaper.
  16. J

    Mercruiser 3.0 oil pan gasket

    Hey Yall, Getting set to get this oil pan swapped on this Mercruiser 3.0LX Pan gets here next week. Looking at gaskets, and somehow these are now running $80 a pop, $100 after shipping. Seems pretty steep for a glorified rubber band. Is there an automotive equivalent available? I've done some...
  17. J

    Mercruiser 3.0 Oil Pan

    Yeah, it's all getting a little taste of the rattle can of love. Whole engine is coming out this winter, and getting stripped down completely and built back new. But I'd like to put a few more Salmon in the freezer before the season is over, and I'm not putting a boat in big salt water with...
  18. J

    Mercruiser 3.0 Oil Pan

    Thank you sir. Much appreciated!
  19. J

    Mercruiser 3.0 Oil Pan

    Halfway through fishing season, and some oil is showing up in my bilge. Turns out it's time for a new oil pan. My engine is a late model 3.0 LX Alpha One. I'm seeing that there are oil pans for 1 and 2 piece rear main seal. Anyone know which I need? Hoping to get the pan on the way, and...
  20. J

    3.0 Valve Cover Breather Fittings?

    Greetings, Got a late model 3.0LX engine here, with a valve cover breather connection that is beveled? It's conical, with the top smaller in diameter to the bottoms, meaning that the hose connecting to spark arrestor likes to fall off? Is this a common problem? Also, I've got 140 psi in...
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