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    SX-M outdrive not going into reverse consistently

    Yes, definitely change/inspect the gear oil. Was it changed recently? SX M drives work best with a quality GL5 rated lube Issue could be simple as a shift adjustment/worn cable. Need to inspect that before swapping drive parts
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    Power Trim Question...

    Have someone stand on the drive while you trim down. If still nothing bounce gently until it trims in Work around for the future is relieve the pressure once the drive reaches full up/out position. Bump it down once quick and your set
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    No power at dash

    Might not matter at this point. You say the fuse panel isn't receiving 12 + volts? If nothing at the dash works the issue is power supply to the dash. Loose/missing connection from the motor to the helm Is the lanyard switch on?
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    95 4.3lx alpha one mercruiser cooling system question

    The mating surface/oring you're referring to is on the pressure/output side of the pump. It would be leaking water if it's failed not drawing air in Would be obvious on muffs with a sound sea water pump
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    What shifter/throttle cables

    I don't think there's any adapter for a 33c style end to work with mercury Like Bondo says, the cables for mercruiser have proprietary ends on them. Need specific cables
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    Couple issues

    Fuel boiling? Like it's hot and boiling? I immediately thought of vapor lock but other than fuel spilling out of carb and landing on a hot intake can't say I've seen fuel boil before I would start with a carb rebuild. Would guess your carburetor is either two bbl rochester or holley. Both very...
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    No Power Master power switch Lund Boat

    First thought would be missing ground or positive lead on battery. Second would be tripped/failed breaker for main power lead to dash accessories
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    4.3 Mercruiser MPI Chugging/Surging and Beeping during turns/Waves

    How about anti siphon valve or fuel tank pickup? O2 sensor may indicate this is an EC motor?
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    Spark plug cross reference question

    Pretty sure your motor takes the ac delco MR43LTS spark plug. Not sure what it crosses to ngk If you post a serial/model number folks here have access to volvo info and can steer you right
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    No power at dash

    Sounds like you're missing either a ground or positive lead at the battery. Being a sea ray there's a possibility there's a breaker in line to the dash/fuse panel power If all is connected and no breaker present/breaker okay I'd check the voltage at both sides of the 50 Amp breaker on the...
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    Oil pressure

    When you did the fuel/ignition swap did you install/connect the audio warning system, specifically the oil pressure switch?
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    trouble getting reverse.

    Pretty sure this was covered earlier in the thread The sea water pump in the drive (your defintion: bottom end) does not "go through" anywhere. The water passage hose in the transom assy has been cut off so the water from the pump simply dumps right back into the water outside the boat
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    trouble getting reverse.

    The cable routing through the transom assy up to the shift plate is specific. It needs to be routed correctly. If not properly routed it can be destroyed rather quickly from the coupler wearing on it or if bent too sharply it can fail prematurely
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    LiFePO Batteries ???

    My go to is if fuel economy is a concern for you then boating is not your hobby Guessing with twins and an inverter your boat is in at least the 30-40 foot class so 364 lbs (average weight of 2-3 adults) is a drop in a bucket comparatively. You will notice little to zero change in fuel...
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    4.3 Mercruiser MPI Chugging/Surging and Beeping during turns/Waves

    Need to connect a diagnostic tool to determine what the fault/beep is. Being mpi the fault should be stored What is the serial number of your engine?
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    does anyone know?

    Apologies for the rant, sunray. These posts are often used for reference/posterity so misinformation only fuels mistakes/unnecessary repairs In your case you are not dealing with any through hull fittings so bronze shouldn't be an option. Brass, as suggested by Bondo and based on my...
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    trouble getting reverse.

    When I do a full bellows job on an alpha style transom assy I attach everything save for the exhaust bellows on the bell housing prior to installing the housing in place U joint bellows, water passage hose, gear lube line (gen 2 only) and the shift cable. The shift cable is much easier to...
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    does anyone know?

    Far out, read the first line of my post #24 I don't read any argument of your post in regards to anything installed on engines/accessories Let's go one step further and demand all engine blocks/manifolds that use raw water for cooling must be bronze and not cast iron
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    Thunderbolt V doesn’t advance timing

    If you can source a mercury manual #24 it covers the t bolt 5 ignition system. Other than replacing the ignition sensor with a new oem I can't think of any other component aside from the module itself causing the issue
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    Thunderbolt V doesn’t advance timing

    Don't know if the temp sensor will retard timing but the knock sensor is designed to retard timing if activated Would guess if the knock sensor is faulty it may be constantly allowing the module to retard timing. Maybe disconnect the knock sensor and see if timing advances properly? FYI it's...
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