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Bad Vibrations - Diagnosis HELP needed
apollak19 posted a topic in Centurion Boats General Discussion
Hi there, thanks in advance for reading and help! My 05 Avalanche has now been in the shop for 3+ weeks that the mechanic cannot figure out the root issue so I'm looking to hive mind some ideas/support on a diagnosis. The boat - 05 Avalanche C4 - Black Scorpion - about 400 ish hours What happened - a few hours into our 3rd day of surfing the boat all of the sudden started vibrating. It's mellow at low speeds and gets progressively worse at high speeds. We immediately got it off of the water and into our local shop. The shop replicated the vibrations. They started by checking the engine mounts and alignment and everything looks fine. They took the prop and prop shaft off to make sure they are straight and undamaged and say those are great. They found a bolt had backed out of the coupler so they replaced that bolt. Still vibrating. Next step was to remove the coupler. Turns out the coupler was cracked and has significant wear on one of the inside edges (I will try and get a picture for you). At this time, they ran the engine, tranny and v drive without the coupler and it didn't vibrate. Because of this, we all felt confident that the vibration was coming from the coupler. However, when a new coupler was put on and the prop shaft was connected again, it was still vibrating. The shop says the next step is to remove the v-drive but this may take a long time because they have to lift the engine and they are busy this time of year. They've also never seen an issue like this where the vibes came on all of the sudden and the coupler was cracked but not causing the vibrations. Confidence level is low at this point. I'm writing here wondering if anyone has seen this issue and if you have any idea of what we should be looking at/for. Appreciate any help I can get!