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    4.3 throttle dependent squeal - not belt related

    This is the first run after replacing front and rear seals, water pump and alternator, on my 4.3. I tested the belt tensions and tried the water spray test, then isolated the pulleys - no issues. Finally, I removed the belt and started it just to verify and the squeal continues. Sounds like...
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    4.3 electrical issues (intermittent is a nasty word!)

    2 intermittent issues, at this stage, after engine removal and reinstall. Goal today was to fire her up and hopefully adjust idle/timing. What keeps happening (Twice, this self corrected after about 45 minutes and I was able to try again. ) 1) Gauge cluster loses power 2) bypassing oil...
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    4.3 wiring questions - reinstalling engine

    Hello, I reinstalled my transom assembly and am reinstalling the engine after replacing crankshaft seals. In the process, I replaced the trim sender and limit switches. this is for a 2004 4.3 with 4bbl carb and alpha one gen 2 drive. couple of questions: 1) I found a disconnected ground...
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    Specs for external "shop" tachometer

    I'm looking to pickup a shop tach to adjust idle and set timing on my 2004 Mercruiser 4.3 Will one of these $20 "small engine" tachs to the trick? Amazon Tach are they all "pulse" tachs? I'm looking for a wired version to connect to tach pigtail on the harness (purple / grey), but the all...
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    Alpha One Gen II - bell housing bushing/seals - updated design?

    I ordered replacement bushing/seals kit for my A1G2 drive - part 23-806036A1, which I found in multiple parts diagrams. I've seen a number of videos explaining that the upper bushing/seals were poorly designed and has been replaced with part: 805041A2 (with the extended seals housing)...
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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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