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  #21  
Old 01-30-2013
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

Quote:
Originally Posted by knuterikt View Post
When you push the flange onto the drive shaft - do you have a tight fit?
Or does it feel wobbly?
It would be a pain to put the flange back on to try now, but from what I remember, once the flange was pushed all the way in it was a tight fit.

Capt. Gary Randall, I'm with you that the flange is most likely just a softer metal that machined itself, as Faster said. Where I'm uncertain is whether this happened over weeks, years, hours? That would help determine to what extent this failure is a symptom of a larger problem.
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  #22  
Old 01-30-2013
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

Well, now you should have time to engrave your HIN for the officionados !
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  #23  
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

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Originally Posted by Faster View Post
Well, now you should have time to engrave your HIN for the officionados !
Ha! Harmony already got out the wood burner and engraved it in the transom.

Thanks for the tip on Cabo Yacht Center, gentlemen. I've got a poorly worded Spanish email waiting in their inbox as of now.

This forum is the best.
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  #24  
Old 01-30-2013
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

DISCLAIMER: I do not own a Yanmar, not have I ever done anything other than bleed one.

Looking at your photos, and description, I suspect that the "machining" of the inside of the coupling was done on the boat. All it would take is very little play, and the shifting in and out of gear would start to hammer the inner spilnes of that coupling. Eventually, the hammering would shear off the splines, and with a little torque in the right direction, the nut would be spun off too.

I suggest that there may be little pieces of splines somewhere in your bilge.

To repair: get a new coupling - yours is clearly toast -, a new lock nut, AND a new washer (part #2 in the above illustration). I would go so far as to use lapping compound and Prussian Blue to mate the coupling and the output shaft. To get an idea of what I am talking about, look at this article by Maine Sail pertaining to lap fitting a prop. Once the coupling and the output shaft have been prepared, use a torque wrench to apply the right amount of torque to the lock nut. Once torqued to spec, stake the nut.
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Last edited by eherlihy; 02-13-2013 at 09:52 AM.
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  #25  
Old 01-30-2013
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

hello Jeff, I have done many many engine alignments, and I'm going to suggest to you by observation of the pictures that either your output shaft coupling or the shaft coupling or both were hit many times by a hammer that is a definite no-no. This is probably what initially started the problem. That is why I suggest that you have both couplings put in a lath at the machine shop,and the mating surfaces machined. Whenever I replace one coupling I always do this unless they are both in really good condition. The seal rides on the output shaft coupling which is more than likely damaged you will find the seal in the output shaft bearing housing I can plainly see it in the picture. There is no sense in making a repair that could cause more damage. Also to answer your other question about vibration, when you're engine is in neutral and you throttle it up about 1000 RPM you'll notice it really gets smooth. It should act no different when it is in forward or reverse gear if everything is in the proper alignment. You may have to ajust or shim the motor mounts to attain alignment to the couplings with a feeler gauge. I usually use a dial indicator but a feeler gauge will work fine I recommend 25.000 most of the time you need to use a hammer but never hit on the flange of either coupling. The shaft coupling can be hit on the body that surrounds the shaft and hold it in place. The transmission output coupling needs no hammer just the nut to install. When I use a hammer I always use a sacrificial brass rod or a block of wood. After looking at the pictures if you follow this practice you'll probably never have another problem with it. As said earlier make the correct tool out of an old socket using a hand grinder, or do it at the machine shop preferably half inch drive and torque the nut to specifications also using some Loctite if you can get some.
looking at the shaft coupling itself you'll notice a ridge on the inside as a mating surface, that ridge fits inside the output shaft coupling and if it is damaged in any way which I can clearly see it is, it could've been the cause of the problem. The correct assembly and alignment will not only solve the problem but it will also solve the cause as long as your output shaft bearing is in good condition. CaptG
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  #26  
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

http://www.sailnet.com/forums/s2/699...alignment.tmlh
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

Thanks Gary for the good advice. Unfortunately the hammer blows were my no-no. I used a wood chisel to pry the two coupling pieces apart. I think heat/dirt/rust conspired to glue the two pieces together. It was the only way I could get the coupling apart to get at the locking nut. Since the photos were taken I've filed off the metal bits at the edges of the flanges that got bent by the chisel, and polished it all with a fine scotch brite pad, so all that's left should be the pristine inner surface of the coupling discs minus a millimeter or two on parts of the very outer edges (outside of where the four bolts hold the coupling together anyway). Suppose that'll be all right?

From all the reading I've done the past few days, I'm pretty concerned about trying to get off the shaft coupling to take it to a machinist without destroying it and/or the prop shaft. If I could simply keep it attached and adjust the engine alignment to match, I'd be much happier.

Where does a person acquire a feeler gauge or dial indicator, generally? Is that an auto shop buy, a Home Depot thing, an industrial supplier? It'll be a new addition to my tool bag.

Thanks again.
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

any auto parts store will have feeler gauges,and good luck to you have a wonderful trip wherever you're headed baby will cross paths one day.......CaptG
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

maybe!
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Re: Transmission output flange fell off Yanmar 2QM15 - Theories re: why?

I just looked in my Yanmar Parts Catalogue and the flange (item 26) looks different from the one in your picture. The one in the catalogue looks much deeper so more spline length. Attached is what I show. Is it possible you have the wrong flange.
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Transmission output flange fell off Yanmar 2QM15 - Theories re: why?-copy-yanmar-parts-080.jpg  
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