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    Help quickly please

    this is my understanding as well, your heads will not fit correctly on a mark iv block and vice versa, also i believe mark iv blocks have a machined area for a block mounted fuel pump whereas gev v and newer do not, hence the water pump/fuel pump assy on carbed gen v engines as stated your...
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    Carbed Mercruiser 260 5.7L Missing Above 4000 RPMs

    4 psi might be okay for lower rpm speeds but once the boat planes or trying to get on plane pressure should be a steady 6-7 psi it is in your interest to check fuel system vacuum as well, should be no more than 2 in/hg at all times
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    Alpha One Gen 1 grinds going into gear

    install the threaded stopper until it bottoms out with the cable end, then back it off just til the shift slide rotates freely on the cable. then install the safety wire sounds as if you have too much play in the slide, or there is wear in one or more shift linkages/cables
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    Marine Power 340 Pulley Wobble

    it's there, you can see it in the second video, right side of the pump the pump will have a bit of movement due to the concentric shape of the housing. its possible the bushing on the support is worn and allowing excess movement as far as the water pump pulley/balancer movement it does not...
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    IMPELLER IN OUT DRIVE

    any water exiting from the propeller would be the exhaust side, i was referring to the intake side which during a backflush would be coming out the intake ports on either side of the gearcase/lower half
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    IMPELLER IN OUT DRIVE

    i believe post was referring to removing just the lower half of the drive mercruiser sterndrives are composed of two halves, the upper driveshaft housing and the lower gearcase/gear housing remove the entire drive assy for inspection, disconnect speedo coupler, remove trim pin, remove six nuts...
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    496 Mag HO RPM issue

    i'll play... first, verify the tachometers are reading correctly, can be done with an advance timing light with rpm capability attached to plug lead second, verify both throttle plates are opening evenly and fully third, agree with fun and verify exhaust system is open and allowing full exit...
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    Alpha One Gen II Shifting

    gen ii would most likely be equipped with a thunderbolt ignition, shift interrupt works with the wht/grn wire into the ignition module shift interrupt that wires to coil would be on a conventional (points) ignition system simple test for interrupt switch is to engage it manually with the...
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    IMPELLER IN OUT DRIVE

    possibly failed/broken flapper(s) blocking the exhaust. it is important to have proper flow into AND out of the cooling system but ime the "in" side of cooling is where most overheat issues arise yes, removing the drive and inspecting is a good idea, check both intake and exhaust passages for...
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    IMPELLER IN OUT DRIVE

    first off, there's no need to yell bravo does not have an impeller in the drive, only an engine mounted sea water pump debris can become lodged in a cooler/heat exchanger have you backflushed the drive to ensure good water flow?
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    Alpha One Gen II Shifting

    no polarity on the shift interrupt switch verify all adjustments are correct, silicone spray may help but if your lower cable is hanging up its probably time to replace it
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    Mercruiser 5.0 TBI

    i know, i read the thread title tbi with a mefi controller, if you have access to a rinda scan tool or diacom you may retrieve the active fault. mefi 2/3 does have some freeze frame capability but as i stated earlier the fault is active, should be quite easy to retrieve without using a scan...
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    Mercruiser 5.0 TBI

    mefi will in most cases have some freeze frame codes regardless, your engine has an active fault, i.e. the audible alarm is sounding thus indicating an active fault. a scan tool will identify this active code i'll guess at it....intake air temp sensor fault
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    Mercruiser 5.0 TBI

    use a scan tool to check fault codes, otherwise you can keep throwing parts at it til ya succeed
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    throttle cable..?

    what is your WOT rpm as it is right now?
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    Guardian mode activation with no explanation from gauge

    you can check the setting of the trim sender(s) with an ohm meter. can't remember offhand what the value is but if you have access to either the manual for the engine or the smartcraft manual the set up procedure is outlined fairly well in both. however if you are getting the trim sensor fault...
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    Guardian mode activation with no explanation from gauge

    i doubt a trim sensor fault would cause guardian mode, it will cause a warning horn and set a fault if the boat is equipped with smartcraft and connected to the digital leads at the engine harness. guessing you have smartcraft gauges?
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    At full throttle and it died...

    first guess would be lanyard switch, then ignition fuse at helm if equipped
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    Lower Shift Cable Question - Alpha 1 Gen 2

    alpha cables come from the factory with a chafe guard that is a white spiraled piece of plastic that can bind in the plastic bushing at the gimbal housing, check to make sure the chafe guard is removed oem cable kits come with a new chafe guard however it is not necessary to install it on the...
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    At full throttle and it died...

    you say nothing displays at the helm instruments? no key on warning or gauge movement with key just in the run position (not cranking)?
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