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    Mercruiser 3.0 diagnosis / serial number decode

    Yes The tune up info you seek should be on the engine. Your first post has a picture that shows the engine information sticker. It's red and located on the valve cover just below the shift plate
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    Manfiold and elbow gasket replacement / torque and bolt question

    Iirc the torque spec for manifold/riser is 25-35 lb/ft. Only reason I remember is to me it seems low but it is the spec. Can't recall ever using a torque wrench on those bolts, my method is tighten, run it and move on the next project, ymmv
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    Starting problems.

    Clean where it needs to be, would be a pleasure to diagnose irl. At this point, given information would suggest you're beyond internet help. I have no idea why you've removed valve covers/displaying photos of the flywheel/ring gear
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    Help and clarification

    You own one of the greatest engines produced in the past 70 + years of American capitalism. Cheers Your setup requires a present, logical representative of said boat.
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    Starting problems.

    Oof, Your insight as of late has been wandering. Keep in mind, production/manufacturing takes all kinds. Let's be pragmatic about s/n location. OP: your s/n is located on either the rain hat or just above the starter motor. A mirror and flashlight/torch will aid you immensely
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    Starting problems.

    Via serial number. Mercury has a vast database concerning engine/drive application Seek local reputable dealers/parts representatives for further information
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    Bravo 3 stuck in reverse

    But the person installing it varies
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    Looking up Stern drive parts by stern drive serial number

    Apt investigation. Two possible base/lower seal assemblies are available for your drive. One is "taller" and seals accordingly with the driveshaft pin under load. The other style utilizes gear cut/load to operate. One base is blue, tother is black.
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    Startting issues

    You should investigate tune up/fuel delivery. Focus first on ignition specs/replacement parts.
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    Bravo 3 stuck in reverse

    Not me. The routing of the lower shift cable is important. If routed incorrect there's the possibility of engine coupler severely wearing the cable and right quick too among other possibilities including your shifting issue. Once, I had a come back and the mess was striking... If I were in...
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    Volvo penta inboard tilt trim

    Based on info provided, you appear to have a short to ground, or at least had one. Replacing the relay could very well have solved your issue, they do fail. Monitor the relay and trim system, the failed relay may be a result of a further issue
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    Volvo penta inboard tilt trim

    Could be the breaker/fuse or "resetable" fuse for your trim. Volvo did/does many different styles of trim system power supply. Some on the breaker panel you've pictured, others are divorced from there. An ohm meter and oem wiring diagram/visual confirmation of wire routing will help you immensely
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    Propeller not spinning No FWD or Reverse

    Your mind is yours, not ours Go boating. Maintain your vessel properly and fix it when (it will) breaks
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    Mystery issues with Volvo Penta since I/O service

    Not saying anything about your choice of service provider but if they didn't recognize the wrong belt (see: provided) install either their not honest or have better things to do. And, if they could not initially service the serp belt I'd be suspect of their handling of rebuilt props. Especially...
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    3.0 Mercruiser Choking

    Thank you for posting your resolve, appreciate the sentiment. As for your fuel vent line and other fuel hoses, is recommended replace every 10 years regardless of condition
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    2004 merc 350 mag mpi high temps on new dry joint manifolds

    No mention of inspection/replacement of sea water pump/impeller and associated cooling plumbing to/from the pump. Closed cooling or raw water?
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    3.0 Mercruiser Choking

    Guessing by "adjusted pitch" you mean rerouted the vent line and cleaned the "sludge and gunk" out? Glad your issue is resolved and would suggest if all the above is true you should replace the entire vent line with approved fuel rated hose and inspect/replace the other hoses/fuel lines...
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    Propeller not spinning No FWD or Reverse

    Didn't ask about bubbles. Just want to make sure gear oil in drive us full/clean. You checked the dipstick/monitor? If so and you're satisfied the gear oil is sufficient you should remove the drive and inspect the engine coupler/drive shaft splines
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    Mystery issues with Volvo Penta since I/O service

    First thought is your mechanic installed the incorrect serpentine belt or the belt routing among the pulleys is incorrect. Did they repair and reinstall your original propellers or sell you new/different props?
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    Propeller not spinning No FWD or Reverse

    Have you checked the gear oil level/quality?
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