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2021 Yamaha 275SD engine died - thoughts?

ZGhost

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Those shafts/splines fit very tightly, usually, at least in N/A 1.8s, I can not imagine you could fit the shaft (protruding from the stator segment of the pump) into the coupler while misaligned, the fit is so tight. Even too much grease will cause an issue to fit it it. But... you are probably right, what else could it be???

Very strange.

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Under load and torque with possible vibration is a different story. My guess is the shaft is shifted to one side of the tolerance spec where it can just be dry fitted for installation. But under load, it’s experiencing undesired bending causing the shaft to snap.
 

ripler

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There is no way Yamaha would send an engineer to inspect a boat unless they were having widespread problems. It sounds to me they are having issues and they are trying to gather as much data as possible so they can find the cause.
 

swatski

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There is no way Yamaha would send an engineer to inspect a boat unless they were having widespread problems. It sounds to me they are having issues and they are trying to gather as much data as possible so they can find the cause.
I believe it is a routine process, they send an engineer/expert appraiser to determine the course of action in some, but not all, warranty claims. I was told they have some 3 experts, nationally, doing this - and travel to servicing dealer locations. This may or may not be completely accurate, I have no way of verifying this info.
I've had a pleasure to participate in this process, twice, lol. As far as I know, there is zero communication between the company to the owner regardless of the course of action they decide to take. My stats were 50% (success rate). In the case they covered a replacement of a cracked 1.8 N/A head assembly, there was no communication, it took ~6 months due to part shortage and what not, and then I was told my boat is ready to be picked up. All good, very happy overall. In the other case, they refused to cover a faulty tower locking mechanism failure, in that case I actually met one of their experts (in court); I was not impressed, he did not do very well.

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Five Faces

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I just read through this entire thread. Wow...I'm so sorry that you have to deal with this. If it makes me sick to my stomach just hearing about it, I can't imagine how you are feeling. I wonder if there is some type of lemon law that would apply here where you can get a full purchase price refund and just wipe your hands clean of it?
 

tdonoughue

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I don't know if you can assume widespread problem, but I think you can assume that mommy Yami saw this as unusual/significant enough to justify figuring out what happened.

While it could be a torque issue, that is not where I would lay my money. My money would be on the vibration. At the speeds of our engines, if you have a vibration, as soon as you hit the harmonic, it would rip up anything... As noted, if something were that misaligned, things would not fit (unless the dealer used a sledgehammer or something--unlikely).

Of course, all just a guess at this point. Very sorry to hear the additional issues and waiting for the next update.
 

swatski

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I just read through this entire thread. Wow...I'm so sorry that you have to deal with this. If it makes me sick to my stomach just hearing about it, I can't imagine how you are feeling. I wonder if there is some type of lemon law that would apply here where you can get a full purchase price refund and just wipe your hands clean of it?
Not at this stage. It think it would be at best premature to try to invoke lemon law here.
While this has already been deemed to most likely represent a warranty-covered issue, Yamaha has not had a chance to try to fix it, yet.

To be clear, I feel for the OP tremendously, having walked in his shoes so to speak, and no one here would confuse me for a Yamaha fanboy. However, fair is fair. Not letting Yamaha do their thing is a risk in these situations. I would likely do what the OP did, too, try to fix the darned thing at my own expense in a bid to save the season.

It's not clear to me if the service center the OP used took responsibility for this first attempted repair, if the fix was warrantied to work.
Hopefully the dealer/service center will circle back and start from scratch, the OP would be out of pocket for the expense for the initial repair/attempt, but hopefully they can find and address the root cause and a permanent fix.

This may take some time to resolve. It sucks azz, and makes me cringe.

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BGN123

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The Yamaha repair place is great. They are giving it another go. I’m not dealing with the Yamaha possible six months thing. If that were a possibility I would dump the boat and buy another. I just want it to work. Does feel a bit like a lemon though. Guessing when they find the problem it will be fine. They just obviously haven’t found the problem yet.
 

mrcleanr6

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Man that whole situation sux royally. Im glad the dealers svc is good to work with. Thats really makes a difference when something like this happens. Your right though, they meed to dig deeper than they did before. Something else is going on there beyond a faulty shaft.
 

tdonoughue

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I suspect that mommy Yami thought so as well. That is why they wanted to inspect it and see what was going on...

Unfortunate. Let's hope they can get to the bottom of it (and educate us all).
 

BGN123

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The dealer is telling me to call the 800 number. The local Yamaha service guy is helpful. I bought the boat from out of state.
 

buckbuck

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Hold those broken parts hostage as leverage to be fairly treated! Don't let them go.
 

BGN123

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Here is what was done last time. Had another guy look at it and he said engine blown. Headed to the place that does warranty work. Nightmare. Screw this piece of junk. 52 hours. Blown engine and broken drive shaft (not sure if drive shaft broken this time. Calling Yamaha tomorrow and complaining. Spring break blown too. 2C0EA691-9FA0-4146-9B07-BDB3449A4F7A.jpeg
 

mrcleanr6

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damn ok. well to be perfectly honest i would be kinda glad that is the issue. the svho is a known reliable engine so its easy for the dealer to put a new one in and problem solved. what i would hate to see is some type of mystery problem where the dealer really couldnt identify 100% what the issue was and they just started changing things in the hopes it fixes the issue. those are the ones that a real kick in the nuts and it always leaves you wondering if the boat is gonna fail on you in some way because your not really sure if they got it. the whole thing sux though that 2 odd breakdowns happened so close together to the same guy.
 

BGN123

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High quality problem right? We are a bunch of lucky people who can have a boat! If it breaks again I’m buying an HCB Seunos 4 years ahead of schedule!
 

ripler

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The blown engine still doesn't explain how the drive shaft broke in the first place.
 

HangOutdoors

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@BGN123 I don't blame you. I would be fit to be tied right about now, especially at what you paid for it. Nothing I can say will do much, but just hang in there and try and get through it.
 

swatski

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The blown engine still doesn't explain how the drive shaft broke in the first place.
I would agree, it doesn't.
But - a broken shaft, twice, could explain the blown engine.

Basically, a broken main bearing, or broken shaft in this case, would bend the crankshaft and destroy the motor - one example of failed shaft bearings leading to blown 1.8s was posted by @AboveTheBest, and was documented well on this forum.

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