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    7.4 mercruiser bouncing idle, poor performance

    Hey guys, I have a 1996 7.4l mercruiser mag, bravo one drive Webber 4 bbl carb and a thunderbolt 5 ignition. Boat was running fine back in March, took it ou last week and she was barely running. First it won't hold a low idle, when it does it bounces up then down then eventually dies. It also...
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    Mercruiser MCM 454 Bravo 1 Gen V 1996 Charging issues

    My boat is a 1996 Maxum 2300SC with Mercruiser MCM 454 Bravo 1 Gen V 1996, serial 0f362346. My batteries had died from leaving a light on in the cabin, I jumped the boat in the drie, ran it for 20 min and headed to the lake, boat started up fine but then died the next morning on the lake. I got...
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    1978 met cruiser 140 will not trim down all the way

    I have a 1978 mercruiser 140hp stern drive. I am having problems with the trim going all the way down. It goes up with no problems and down fine until the last 2" and it stops. I have tried bleeding the cylinders and it still does the same thing. The problem started after I replaced a leaky down...
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    18.5' Starcraft Starchief with 140hp Mercruiser prop question

    So my boat is a 18.5' Stracraft Starchief, I dropped in a rebuilt 1978 Mercruiser 140hp with a pre-alpha 1.98 leg on it. My question is I am currently running a Rubex 14.5" 19p prop and my WOT is 3600 rpm, pushing at about 33-35mph, hasn't changed no matter what. I have rebuilt the carb...
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    Mercruiser, odd rattle

    Mercruiser 140, new rebuild from machine shop. Since 1st startup, it had an odd rattle at 1000-1100 rpm almost sounds like the lower flywheel cover is loose, though it isn't (already checked) it doesn't happen at any other rpm just around 1000, and not lower. Otherwise engine runs great, idles...
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    Mercruiser 140 water leakage at transom

    I have a 140 Mercruiser (1978) that has just been installed (complete tear down and re-install) but when I run the motor on the muffs (hasn't seen the water yet) I noticed water coming out from beside the water intake hose on the inside of the transom? I can't figure out what might be causing it...
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    Shift cable issues

    I am just reconnecting my shift cables on my 1978 Mercruiser 140 and for some reason it is always just a ch out in either forwrd or reverse. If I set it up to shift into forward I am out just a little for reverse, then if I follow the manuals instructions then I adjust the reverse and I am out...
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    What caused my engine malfunction?

    I ahve been on here before with my boat, It has a Mercruiser 140 Hp bolted up to an old 110 outdrive (Merc Ia with ez-shift) anyways just yesterday that motor crapped out on me , something internal not sure what but sounds like a blow piston or similar. Anyways the rundown is this, I did...
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    Low WOT rpm?!?

    OK, I have been battling this for half a year now. I have a Mercruiser 140 Hp (1978) freshly rebuilt by machine shop, bolted to a 1967 Merc I ez-shift (1.84:1 ratio) All of this inside an aluminum starcraft hull (starchief, 1967) No matter what I have done my max RPM is 3600 RPM. I have...
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    Mercruiser 140HP Overheating and low WOT

    I have a fresh rebuilt 1978 140HP Mercruiser running on a 1969 Merc 1 outdrive with a new water pickup pump installed (never turned dry other than by hand), 19p; 14.5" prop. The engine is pretty much brnad new, block and head came assembled from the machine shop, new manifold, riser, water pump...
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    Mercruiser 140 dies once accelerated under load

    The culprit is a 1978 Mercruiser 140, new block, new head, manifold, riser, etc... The carb was just rebuilt with a new kit, new distributor cap, condenser, points, wires, plugs.... The engine runs fine in nuetral, idles and revs. You kick it into gear and it idles fine at 700 rpm. The second I...
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    Rebuilt Mercruiser 140 smoking on first startup..

    It is a 1978 Mercruiser 140hp, just rebuilt, just got it going tonight but it has a lot of smoke coming out of the exhaust. So much that it smoked me out. The compression tests were 140 on all four cylinders (spec says its fine). So is this a normal thing for a rebuild?
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    Rebuilt Mercruiser 140 dies after start

    I rebuilt a 1978 Mercruiser 140Hp and now am having problems getting it going. Compression is 140 on all 4 cylinders, Spark on all four, timing is set ( at least close enough until I get a gun. And the Carburetor has been rebuilt with the float set at 1/2" and float drop at 1 7/8". What...
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    Solenoid Pinout??

    I have a 1978 Mercruiser 140, it has the different type of solenoid that isn't like in the wiring diagrams in my manual. I is the one as seen in this pic as num,ber 36A http://www.boatfix.com/mercag/parts1.asp?partno=1586&block=0&img=CRUISER/68573/WIRE.pdf Does anyone know what the pinouts are...
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    Merc 140 Rebuild questions

    I bought a rebuilt block, 1978 Mercruiser 140, and it came with all the fixins. Well the head and manifold ended up needing replacing so I just got in my new head, manifold, down pipeand water pump. Anyways I just started to tinker around and I was wondering, should I be able to turn my crank...
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    So I bought a rebuilt 140 block...now I have a few questions.

    It is a 1978 Mercruiser 140. The block has been completely rebuilt, new pistons, bearings etc... First, which serial number do I go by? the one on the block or the one on the valve cover? As they are different. There is a large metal flake in the blocks cooling, how should I get it out? And...
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    Mercruiser Engine to Drive Compatability

    I posted a while back regarding swapping my engine, an old 1965 110 Hp for a 120 or 140. Now its down to it, need an engine to get going so I am trying to figure out what the compatability is from the 110 to the 120 to the 140. Can the transom plate just be swapped for the 3.0L or 140 plate? Or...
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    Aligning Shift Shaft on old ez-shift Merc

    I have a Merc 110 I/O with EZ shift leg, my question is, how do I properly align the shift shaft so that when I get the lower unit back on it will actually engage? I am getting tired of taking the leg off and putting it back on!
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    1965 Merc 110 / Merc I Stubborn shift shaft seal

    So I removed the lower unit to replace the impeller and what do you know the lower shift shaft seal needs to be replaced too. Not a problem as I bought the gasket kit from my local dealer. I custom fabricated a socket to fit the brass seal but it wont budge....at all! I have tried the old...
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    Mercruiser 110/120 swap?

    I have a 1965 Merc 110, cracked block. I haven't been able to find another 110 so my querstion is......can I get a 120 and swap it with my 110? will it bolt up to the sterndrive assembly or would I need the whole package? If that is the case any chance a 3.0L would drop in? Thanks in advance.
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