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Old 30-11-2014, 09:30   #1
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Identify This Shaft Coupling

Hi folks-

This flex coupling came with my boat -coupled to a Hurth HBW250 which is hanging on the back end of a venerable old Perkins 4-154. installation dates to 1990 ish.

I am not familiar with this particular coupling - can anyone identify it?

thx
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Old 30-11-2014, 09:50   #2
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Re: identify this shaft coupling

Drive Saver or PYI couplings.
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Old 30-11-2014, 09:54   #3
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Re: identify this shaft coupling

2014 Stright-MacKay Ltd. Catalogue

Stright-MacKay catalogue
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Old 30-11-2014, 12:33   #4
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Re: identify this shaft coupling

thanks guys, but nope, not a drivesaver or a pyi. or at least nothing they currently offer looks anything like this coupling. I've used the drivesavers before - they are just plastic blocks that sit between the two mating faces... and the pyi ones are similar but have an offset bolting pattern with stainless backing plates.

In the pic of mine above, you can see that it has two face flanges - one on the output of the gearbox and one on the shaft end, which are thrubolted together, through black elastomer elements with a full diameter, steel, center element.

anyone else?

thanks-

bg
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Old 30-11-2014, 15:12   #5
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Re: Identify This Shaft Coupling

It looks like an older Vetus unit. It the shaft end tapered?
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Old 30-11-2014, 15:24   #6
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Re: Identify This Shaft Coupling

it is an older style vetus coupling

Vetus Products - Discount Yacht Supplies, Vetus Nautical Accessories, Scandvik Parts, Garmin Marine Electronics
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Old 30-11-2014, 18:00   #7
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Re: Identify This Shaft Coupling

thanks guys - it sure does look like that older vetus unit.

guess I'll take her apart on the bench and see if there's life left in it yet.

thx
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Old 01-12-2014, 09:38   #8
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Re: Identify This Shaft Coupling

Perhaps it is a component of the Hurth design. I have a KBW10 gearbox on the back of my Yanmar 2qm20. Just had Anthony Keats rebuild it this spring. The Kanzaki Hurth service manual indicates that the flexible coupling was part of the design team effort to cope with both alignment issuses with the shaft and engine mounts. Still functioning after 37 years.
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