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    Alpha 1 Gen 2 - leak & transom service questions

    1999 Stingray 4.3 - owned since 2013. 216 hours on the meter. Original bellows (25years); shift cable & cable boot replaced in 2016; impeller serviced regularly; trim sensors have been disengaged and “bypassed” since 2005. Primarily used in salt-water, but well rinsed with Saltaway and dry...
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    Stalling, sudden low idle.

    Mercruiser 4.3 warmed up fine. Dropped it in the bay and she kept stalling in nuetral. Just seemed “cold” at first so I let it warm a little longer. Finally behaved as expected. Didn’t even get out of the harbor and I noticed my throttle was high, but she was barely moving. Then she stalled...
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    4.3 crankshaft/housing oil leak - next steps?

    greetings all. found oil in the bilge and isolated it to the crankshaft seal or housing. Does not appear to be an oil pan issue. I found no obvious corrosion around the housing (from what I can reach). Lost about 3 oz of oil after a 3-day weekend - running ~ 8-12 hours at various speeds...
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    Engine hour meter clicks with ignition on, but engine not running

    This doesn't seem correct. What could cause this to happen? 1999 Stingray 190LX 2004 Mercruiser 4.3L 225hp 4bbl Quicksilver repower: SN: 90004747 Engine PartNo: 807736R11 date: 03252004 (original engine SN: L332123) Alpha 1 Gen II - Transom: 0L517680 Drive: 0L192679 1.62 R (1.81R scratched on...
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    Fuel gauge pinned full w/o power

    Hello, my fuel gauge is pinned past full with or without power, ignition or disconnected battery. I’ve checked all the wiring and found no corrosion or loose wires. does a pinned gauge indicate a bad gauge? thanks. 1999 Stingray 190LX 2004 Mercruiser 4.3L 225hp 4bbl Quicksilver repower...
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    Rubberized or Epoxy undercarriage roll on for salt water trailer?

    Hey all, I'm considering coating my saltwater trailer with an undercarriage roll on, 1) to better protect from dings, which always result in rust and peeling paint, 2) to seal cracks between fender components (which always rust out), and 3) better foot traction (especially on steps/fenders)...
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    4.3 how to remove thermostat/sleeve from housing

    While flushing on muffs, I noticed my temp rising and falling based on RPM. It's usually very stable, so I decided to remove and test the thermostat. Housing was removed without issue, but the sleeve and thermostat are stuck. I can't remember if these slid in and out easily when I replaced...
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    4.3 Replacing exhaust manifolds - ditch nylon drain plugs?

    I’m replacing the exhaust manifolds and elbows that I previously replaced in 2013. All has been fine except for a cracked nylon drain fitting… fixable, but a real pain. I read about changing that fitting to a 3/4” NPT brass elbow fitting, but stuck with the nylon. Now, i’m installing a...
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    Need help locating 4-6psi fuel pump for 4.3 w/ 4bbl carb

    I'm stumped! I cannot find a suitable replacement fuel pump with 4-6psi operating pressure! My OEM fuel pump (861155-2) is operating at 9-10psi. (I don't know if it's always been this high). Carb is flooding. Carb supplier says max of 6.5 psi. Edelbrock also states max of 6.5 psi for their...
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    a carburetor shouldn't spill fuel like this, right?

    recently purchased and installed a Carter AFB-4.3L-Marine-Electric Remanufactured 4 Barrel 4.3L Marine Carburetor - Electric Choke. Same model, installed easy. I have been diagnosing fuel supply and bypassed the oil pressure sensor to test the fuel pump. This is what I'm seeing at the...
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    procedure to manually flush non-running 4.3 engine?

    Is there a procedure to manually flush salt water out of the engine without a running engine? I really don't want salt water sitting in there until I can get it running! I know I can pull the blue plugs to drain, but can I remove the hoses from the thermostat housing and force fresh water...
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    4.3 no start: starter whines and spins freely

    Hi All, After engine started fine, then stalled, then restarted, then stalled... my starter started to make this whine with no apparent engagement of the engine. Is this a broken starter or the connection to the flywheel? Also, is there a procedure for flushing saltwater out of a non running...
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    4.3 firing order - this sequence looks wrong

    BEFORE removing any wires, I traced them all, and this is what I found: The numbers correspond to the FWD numbers on the distributor cap. I would expect some symmetry, and this just seems off. I replaced the plugs recently, and marked them, and this is also the only way the existing wires...
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    Spark plug part number?

    I pulled BPR6EFS out. Please verify BPR6EFS is correct. thank you! My log: 1999 Stingray 190LX 2004 Mercruiser 4.3L 225hp 4bbl Quicksilver repower: SN: 90004747 Engine PartNo: 807736R11 date: 03252004 (original engine SN: L332123) Alpha 1 Gen II - Transom: 0L517680 Drive: 0L192679 1.62 R...
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    spring vapor lock?

    SoCal boat, usually stored in garage, never winterized. Last year it was stored outside. took on water. still not "winterized", but never reached freezing conditions. On first start, it turned a few times, but wouldn't fire. First start of the season is usually a little rough. I let it...
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    stall-sensitive throttle on startup / slower warmup - Merc4.3

    I'm experiencing a low RPM and stall-sensitive startup after some recent repairs: - Replaced lower shift cable - water pump service - replaced cylinder gaskets - serviced and remounted exhaust manifolds & elbows First time out since repairs, my engine turned over fine, while cold, but idled low...
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    How to identify quicksilver repower engine size?

    1999 Stingray 190LX, which came with a 190HP CARB A1 (as listed on MSRP sticker). My engine was replaced in 2004, with a quicksilver repower engine. All numbers that I have are listed below. He said it now has a 4bbl carb and is larger. How can I determine if it's still a 190HP 2bbl, or if...
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    4.3 Merc valve cover gasket replacement

    Greetings - I found moisture around the valve cover seam. I suspect that the valve cover gasket needs to be replaced. Questions: This seems trivial to replace, but wanted to check to see if I'd get a "jack in the box" explosion upon removal. Do I need to remove/reinstall the exhaust manifold to...
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    gear oil in outflow or residual oil from sloppy service?

    I just swapped my lower shifting cable, and changed the water pump while the lower unit was disassembled. I've performed this service multiple times and have been methodical and careful with assembly, using pins, and proper torque. I'm highly confident that everything was installed correctly...
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    Tune up schedule for 2004 Mercruiser 4.3L 225hp 4bbl

    I found "Ignition system - Clean and Inspect condition" = every 100 hours. If it's running fine, is there a time frame or running hours where a full tune up is really required (including replacing Cap/rotor, etc) Thanks original engine SN: L332123 replaced with: 2004 Mercruiser 4.3L 225hp...
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