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    Need Assistance to Diagnose Bravo 3 - 5.0L MPI Vibration

    I ran the engine without the drive attached and there was still a vibration. It also seemed to have a misfire. I replaced the cap as suggested by Vice Admiral Grub and the misfire is no longer there! The cap I replaced was a brand new AC-Delco. I used that brand thinking it would be ideal since...
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    Need Assistance to Diagnose Bravo 3 - 5.0L MPI Vibration

    Not yet, I meant to add that to the list in my response. I'll check the cap first given it's one of the easier possible items to fix. It makes sense that a misfire from a bad cap would cause a vibration that feels like something is out of balance. The cap is new, but I kept the old one for a spare.
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    Need Assistance to Diagnose Bravo 3 - 5.0L MPI Vibration

    I appreciate the insight, experience and expertise! In addition to checking the alignment, and possible misfire, I'm going to run most of the straightforward items to ground with new u-joints and another gimbal bearing (all Mercruiser parts). Regarding Bravo upper unit (cone clutch) in/out of...
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    Need Assistance to Diagnose Bravo 3 - 5.0L MPI Vibration

    Thanks Mike and Scott! I'll check the alignment in several locations by rotating the engine later today. Running the engine without the drive would be a new feat for me. Should I just run it without running water for a minute or should I get someone to hold a hose up to the open water port on...
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    Need Assistance to Diagnose Bravo 3 - 5.0L MPI Vibration

    Hello Fun Times and Mike, Thanks for the great info! Mine is a 2004 (OM69xxxxx). It has the newer style rear mounts. I followed the Mercruiser instructions that came with the coupler, basically the same instructions in the service manual which likely pre-date the Service Bulletin 2009-11. The...
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    Need Assistance to Diagnose Bravo 3 - 5.0L MPI Vibration

    Either seems likely. Regarding the coupler bell housing orientation, the holes appeared to align. If I missed something, seems there should be a visible gap. There might be something with the rear mounting hardware. It was a bolt, then washer, then spacer. I had to put some torque on those...
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    Need Assistance to Diagnose Bravo 3 - 5.0L MPI Vibration

    Greetings, Seems I'm in a bit of a pickle. History No vibration The coupler was worn Installed new coupler & gimbal bearing Alignment tool moves w/2 fingers Now there’s a noticeable vibration 1000 - 3200 RPM (didn't go higher) This is noticeable both when tied up to the dock in neutral...
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    Torque Spec for Bravo 5.0 MPI Coupler Bolts

    Outstanding. Thank you!
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    Torque Spec for Bravo 5.0 MPI Coupler Bolts

    Where might I find a copy of Manual 31?
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    Torque Spec for Bravo 5.0 MPI Coupler Bolts

    Thank you!!!
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    Torque Spec for Bravo 5.0 MPI Coupler Bolts

    Outstanding. I already tightened them to 50 ft lbs. Before I un-torque and re-torgue them to the lower figure, any thoughts on what this might do to the orange stuff that was on the new bolt threads?
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    Torque Spec for Bravo 5.0 MPI Coupler Bolts

    Would anyone know which is the correct torque spec: (1) 50 ft lbs per the service manual 90-864260001 OR (2) 35.4 ft lbs per the piece of paper that came in the bag with the new coupler bolts Engine:5.0L MPI BRAVO - 0M600000 THRU 0W059999 The coupler is an OEM Mercruiser coupler # 8M0098795
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    Mercruiser MPI Won’t Stay Running

    This issue turned out to be several bad items - the IAC, the injectors, and the Crankshaft position sensor. All were aftermarket via Amazon. Only using OEM going forward.
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    Mercruiser MPI Won’t Stay Running

    Just completed a total gasket job on perfectly good running engine with 300 hours on it - head gaskets included. New Delco 41-993 plugs, cap, rotor, CPS, and Cool Fuel pump. The engine starts and runs smooth for a few seconds, then stalls. By feathering the throttle, it’ll try to stay running...
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