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  1. L

    Mercruiser 4.3 V6 engine idling fast

    Cliffs is great for parts and he has a forum where you can ask questions about rebuilds and tuning problems. With the QJet getting the idle air tubes clean is important for getting a smooth idle. I would usually set my idle needles at 3-3.5 turns out. That flex tool with the attachments is a...
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    Mercruiser 5.0 cooling hose swelling into serpentine belt

    I've had good luck with Barr marine, they do make the Merc dry joint. With the dry joint while you don't have the risk of a leak at the old style wet joint interface, if the elbow or manifold rots through, you got water in a cyl. So dry joint is an improvement, but it does not eliminate the need...
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    Mercruiser 4.3 V6 engine idling fast

    Also, the right gasket for the QJet is that thick one, not the thin ones you see sometimes, make sure to use the right gasket. The QJet is a fairly complex carb and it helps to watch videos on the rebuild process before you start pulling it apart. That said, if it is an original un-molested...
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    Mercruiser 5.0 cooling hose swelling into serpentine belt

    If it was used in salt water that long even with low hours the elbows will corrode like crazy because water drains out of them, so salt water + air = maximum corrosion. I'd get prepared to replace that whole exhaust system. The other risk besides overheating is if the exhaust rusts through you...
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    Need part 0986272 - Impeller Housing but its obsolete. Any suggestions?

    Yep you definitely need the housing for the cone clutch King Cobra.
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    2003 Mercruiser 4.3L Trim Pump Leak

    I went over to West Marine and bought their brand, you can also use Sierra brand. Just redid both of my 36 year old Cobra trim cylinders. One was leaking and the ram rods were both pitted and the aluminum eyelets on the ends were really corroded. So I left the original rams on the boat, removed...
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    2003 Mercruiser 4.3L Trim Pump Leak

    Why not use the Mercury Tilt n trim fluid?
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    Need part 0986272 - Impeller Housing but its obsolete. Any suggestions?

    post up a pic of your drive, let's figure it out for sure.
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    OMC Cobra hard to shift to neutral.

    Your idle speed is too high, if it's that high then the ESA may not be able to lower it, get the engine in good enough tune to run at 600 rpm, and re-test it. A Ford 302 in good tune should have no problem running at 600 rpm. Do a tune up and clean and adjust the carb, it ain't rocket science...
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    Need part 0986272 - Impeller Housing but its obsolete. Any suggestions?

    https://www.crowleymarine.com/omc/oem-parts/stern-drive/1992/574apeamh/water-pump-adapter?ref=20 is what you have, the cone clutch King Cobra? Because there were models that were also called the King Cobra, that were actually still a standard dog clutch Cobra with some special feature (high...
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    Ran fine last fall, now overheating. Need ideas

    I agree the high water pressure suggests water isn't getting out like it should. Have the exhaust elbows been checked for clogging? Fresh water or salt water use? Manifolds and elbows, are they stainless steel, or cast iron? Exhaust flapper on the transom?
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    Mysterious Milky Oil - Not Risers...

    I think you posted this same question over at the Hull Truth forum and I responded there; looks like you have a cracked or rotted through cyl head, it can be fixed if the lower end (block & rotating assembly) is still in good shape, but you want to verify that first. That is a pre-vortec 4.3 V6...
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    2004 merc 350 mag mpi high temps on new dry joint manifolds, one thing after another with this boat

    Also watched your vids, I have a couple of suggestions: 1) it is much better for the impeller to use proper muffs, than to run it in a trough as you are doing in the vids. An inboard impeller set up is not designed to pull water up into the drive, it is designed to work with water filling the...
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    2004 merc 350 mag mpi high temps on new dry joint manifolds, one thing after another with this boat

    https://www.dropbox.com/s/ysj65t93un6dyuy/Cobra%20running%20on%20the%20water%20hose.MOV?dl=0 this is an OMC Cobra which is similar to a Merc Alpha, see the water coming out in front of the lower unit?
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    2004 merc 350 mag mpi high temps on new dry joint manifolds, one thing after another with this boat

    Usually you will not see much water if any at all coming out of the prop at idle speed when you're running it on a water hose on land, but for sure you will see water coming out of the idle relief ports which are under the transom mount.
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    2004 merc 350 mag mpi high temps on new dry joint manifolds, one thing after another with this boat

    Well for some reason it appears that your exhaust elbows are getting enough water but the manifolds & risers aren’t. IIRC on this Merc warm manifolds system the elbows always get water but the manifolds don’t get flow till the thermostat opens. So the elbows will feel cool but the manifolds will...
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    2004 merc 350 mag mpi high temps on new dry joint manifolds, one thing after another with this boat

    I'm guessing that Merc changed the exhaust to the dry joint exhaust because leaking manifold to elbow gaskets was a common source of water in a cyl. Maybe not a big problem in freshwater but in salt water it can be. So they separated the water flow and the exhaust gas flow with that new design...
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    2004 merc 350 mag mpi high temps on new dry joint manifolds, one thing after another with this boat

    If the manifolds & elbows were clogged I wonder if the water distribution housing is too; I’d check it for clogs. Also did you measure raw water volume flow? How about Bravoitis? They are known for a fitting in the transom mount that restricts raw water intake.
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    Mercruiser 5.7, Uneven compression

    Ideally you'd do a leak down test to see where you're losing compression, a good Chevrolet small block should be at least at 150 psi, on my 4.3 V6 it tests out between 160-170 psi. Just guessing the cyls that had water could have sticky exhaust valves, but it could also be corrosion damage to...
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    Any E10 (Ethanol) problems you are aware of on older engines?

    Also on a boat that has not used ethanol fuel there may be varnish deposits in the tank and using E10 May clean these deposits out which can clog filters for a time so be prepared for that.
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