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Old 21-02-2008, 17:43   #1
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flexible shaft coupling for short shaft

I have a HC 33 that always has a mis alignment problem. anyone out there have an idea on a flexible coupling for a short shaft.
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Old 21-02-2008, 18:03   #2
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It would probably be more in your interest to fix the alignment problem. A misalignment will even wear a flex coupler if off too far.

If it will not stay aligned once adjusted you could be in for an unpleasant surprise down the road.

Flex couplers are more for an engines torque and cranking motions, like with some diesels that shake a lot.
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Old 21-02-2008, 19:46   #3
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Drivelines Northwest (Seattle) makes some kind of flexible coupling, I think it can tolerate some misalingnment. I would agree with the post above that you should do everything possible to align the engine properly first before resorting to a coupling to cover up the problem.

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Old 21-02-2008, 22:25   #4
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Aloha Melemakani,
Yes, check engine mounts and do a realignment. There's got to be a reason why it isn't aligned. If you have flexible engine mounts then you should also have a flexible coupling.
I got my flexible coupling from West Marine and they got the right one to me on the second try.
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Old 22-12-2015, 05:13   #5
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Re: flexible shaft coupling for short shaft

Quote:
Originally Posted by SkiprJohn View Post
Aloha Melemakani,
Yes, check engine mounts and do a realignment. There's got to be a reason why it isn't aligned. If you have flexible engine mounts then you should also have a flexible coupling.
I got my flexible coupling from West Marine and they got the right one to me on the second try.
JohnL
Absolutely right Skipper John and everyone else that recommends engine mounts check and realignment

Please look at "Shaft is too short" thread for my recommends on machining a spacer out of nylon. That will help but the misalignment has to be attended to first.

I have replaced 3 engines and had to work up from a new engine bed on each. One was a 135 hp Perkins. This I installed without flexible engine mounts. I used stainless shims to adjust for height and angle. Then bolted the lot down tight.

I mention this as it may be an appropriate solution for you.

In any case the start of a realignment is loosening or even removing the coupling bolts. Then the shaft can be moved backwards and forwards easily.
.
Have the shaft coupling just close enough to be touching the engine coupling.
The misalignment then will be clearly visible.
.
Is the shaft coupling higher that the engine coupling??
Does one side of the coupling have a bigger gap than the other?
Does the top of the coupling have the same gap as the bottom?

If you would like more info please ask.
I just do not want to bore readers if no interest.

Cheers from the top end of down under.
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Old 22-12-2015, 05:57   #6
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Re: flexible shaft coupling for short shaft

Just had a thought

Once you remove the coupling bolts. rotate the shaft. If the shaft or the shaft coupling is out of true it will show on rotation as the shaft coupling will not be in the same position relative to the engine coupling.

If this is the case, no amount of aligning will help. A micrometer dial gauge can tell you if the shaft is true or not.

Cheers from the Top End of Down Under
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Old 22-12-2015, 06:16   #7
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Re: flexible shaft coupling for short shaft

Welcome to CF Melemakani... !

Good advice above... Align so you don't need a flexible coupler, and you'll be good to use one!
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