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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  • 1 Post By Omatako
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Old 07-08-2013
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Output Shaft Coupling

I'm looking for a technical referrence to the requirement to safety wire the set screws on the output shaft of a Yanmar 3GM30F (Kenzaki transmission).

I found on another forum mentioning such requiremnt but cant find the technical/service procedure.
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Old 07-09-2013
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Re: Output Shaft Coupling

When you say technical reference, are you looking for a spec on the wire? The screws?

On the shaft coupling there are normally two set screws set 90° apart with square heads that have a hole through. The screws are turned into indentations in the shaft, tightened and the binding wire is fed through the holes in the squared heads to bind the screws to each other so that if they come loose they can't turn themselves out.

If there is a specification for this, I have never seen it. Some would say use stainless steel wire but given the fact that all the other parts are steel, I always use a plated steel binding wire typically used in normal automotive transmissions. The average auto spares store should have it in stock. I have never had to replace this wire except when removed to loosen the set screws.

Hope this helps
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Old 07-09-2013
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Re: Output Shaft Coupling

This simple idea, but a LITTLE dab of BLUE Loctite on the threads of the setscrews would probably work better than anything else you can do...
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Old 07-09-2013
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Re: Output Shaft Coupling

Quote:
Originally Posted by Johnnycatt View Post
This simple idea, but a LITTLE dab of BLUE Loctite on the threads of the setscrews would probably work better than anything else you can do...
Many insurance companies and most marine surveyors will settle for nothing less than wire-bound set screws. They seemingly need something they can see, not the hidden promise of a chemical locker.

FWIW
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Old 07-09-2013
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Re: Output Shaft Coupling

"plated steel binding wire"
In the US we call it 'baling wire" as it was used to hold hay bales together. Any auto parts store, farm supply, hardware store should have it.
In a real chandlery, you can still buy real monel "seizing wire" if you want to do the job right.

I wouldn't worry about requirements, I'd just make sure to USE wire if the set screws allow it to be used. I lost a ball joint on a car once--while driving--because some idiot hadn't bothered to use seizing wire on a nut and bolt that were designed to be secured with it. Not fun, considering how cheap and simple the wiring job is.
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Old 07-10-2013
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Re: Output Shaft Coupling

There are technical references but I don't have one at hand. The why you should do it has been addressed in responses to the post. The how you do it is best described using a picture:

Output Shaft Coupling-safety-wire.jpg

The wire is attached in the manner shown to draw both set screws in the direction to tighten them.
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Old 07-16-2013
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Re: Output Shaft Coupling

Fryewe has the best answer. I used .032 stainless steel safety wire. I have used it several places on the boat.
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