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    Engine rotation

    yes, boats of that vintage with twin engines usually had one standard rotation engine and one counter rotated engine. Standard rotation engines rotate counterclockwise looking from the back/flywheel end, counter rotated engines rotate clockwise looking from the flywheel end generally speaking...
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    Lower shift cable behavior?

    shift interrupt switch should not be engaging when shifting into either gear, it is designed to engage when shifting from gear into neutral, this is of course under a load. it is near impossible to inspect shift interrupt switch behavior without a load in your case without a load, the shift...
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    Installing a new 4.3 Mercruiser

    pressure test will show if the seal is sound, need to rotate input shaft while under pressure to simulate running drive yoke seal is removed by disassembling the drive shaft assy/bearing pack. remove drivshaft assy by removing retainer at yoke input, best achieved with the special tool which is...
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    Losing Power - After two hours

    strange issue for sure, at this point it sounds like either fuel or ignition, tachometers can be wonky if they are getting an intermittent signal. at this point i'd recommend a full tune up, including fuel filter(s). check to make sure the ignition sensor in the distributor is the latest style...
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    Losing Power - After two hours

    4.3 carb, guessing alpha drive when over revved what is rpm? is this in gear or neutral? loosing power usually indicates a fuel supply issue, can't say for the over rev other than possibly fuel pump/system "catching up" and engine responding to it
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    Losing Power - After two hours

    need more info, what engine/drive package? serial numbers can help, have you done any troubleshooting aside from changing prop?
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    Mercruiser 4.3 cracked intake manifold

    when you say you pulled the plug and drained the water at winterize do you mean the square head pipe plug at the fwd of the intake? in any case that is a freeze crack and intake manifold must be replaced you mention a cracked head? guessing you meant intake, in that case yes the temp gauge...
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    Engine Dies When Hot

    agree, have not seen that aside from changing parts and running the engine i don't see much troubleshooting going on here. its in your interest to check for spark immediately upon the engine dying as i stated before, there is really no need to purchase a suspected failed part, just swap from...
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    Carbed Mercruiser 260 5.7L Missing Above 4000 RPMs

    yes, it's not a good idea to have a filter on the pressure side of the pump. also, as mike states hard line should be used on the pressure side, or braided approved fuel line with flared connections. if you are concerned about filtering the fuel you can add one prior to the pump, but a water...
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    Question on lower unit

    alpha one gen ii lower gearcase assy can't tell if its complete but is missing the water pump assy and the ring in the second picture is the keeper for the bearing carrier retainer
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    Interchanging Stern Drive Lower unit??

    should work just fine, gear ratio is determined by the gear set in the upper driveshaft housing just make sure the water pump is good and pressure test before and after install
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    Help with water leak on 1999 MerCruiser Bravo 3

    possible culprits: -trim hose block gasket/mercathode wire seal -exhaust y-pipe mating surface/o-ring at gimbal housing -u joint bellows -shift bellows -steering shaft seal -gimbal housing seal
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    Testing Alpha one Gen 2 water pump with no gear oil

    gen ii was introduced in 1991, perhaps yours is not original to the boat/engine package? oem water pump kits for both alpha one and gen ii come with a white guide tube to aid in lining up the water passage tube to the housing a lot going on in your post, to my understanding you have removed...
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    Help quickly please

    has been for quite a time
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    Guardian mode activation with no explanation from gauge

    my guess is the in gear/neutral switch is either misadjusted or has failed. ecm thinks the drive is in neutral and will trigger rev limiter/overspeed fault even though the drive is in gear. switch is located on the shift plate freeze frame history can tell you if there is/are faults pertaining...
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    Sea water pump impeller vanes flipped to the wrong way . . . ???

    its possible that yes, the engine did rotate slightly opposite normal rotation upon shut down. this may have caused the pump/impeller to rotate opposite. in any case with the vanes flipped in the wrong direction and having sat for a while they most likely have a set and will not easily return to...
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    Carbed Mercruiser 260 5.7L Missing Above 4000 RPMs

    that's not good, pressure should not be dropping when rpm increases also, get rid of that in line fuel filter, there should be no in line filter on the output side of the fuel pump as far as the vacuum, it's fine that you checked it between the tank and the separator, 4 in/hg is too high but...
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    Mystery Part - Help!

    looks like a bushing that would go over/around the lock pin for an engine compartment lid
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    Edelbrock 1409 hard start, flooding

    definite sign of debris in the float bowl causing needle to remain off seat and most likely other clogged passages time to diassemble, clean, inspect and rebuild the carb
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    Help quickly please

    ah, yes. got sbc on my mind. haven't dealt with many 454 lately mark iv has stamped rounded valve covers, gen v and newer sharp edges/cast covers?
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