Topic: Prop Shaft coupling seems loose (Read 17932 times)

jaymac · « **Reply #25 on:** May 09, 2012, 10:37:08 pm »

Ken the blue screws are out of the question I cant get at the bootm one the gap is 2mm at the most

Dave the shaft needs to be pulled in towards the motor the gap is on the prop side of the coupling

Tug-Kenny RIP · « **Reply #26 on:** May 09, 2012, 10:44:13 pm »

On closer examination of your latest picture I notice that there NO nuts on the prop shaft !!!!!

It's screwed directly into the coupler. This is wrong. To remove the shaft you will have to clamp it with pliers and turn the coupling nut.

This is probably the root of all your problems.

I'm off to bed. I've been thinking too hard.

ken

Stavros · « **Reply #27 on:** May 09, 2012, 10:54:15 pm »

jaymac I know exactly where the play is that is WHY you need to MOVE the MOTOR down towards the Prop thus getting rid of your problem.

You have allready stated in previous posts the there is a gap between the coupling and the propshaft and you have tried to get rid of it with wire so to get rid of the GAP you need to do one of 2 things

1 remove motor completely to put a washer in ....WHICH you have said that you can not due to your fingers OK no probs there

2 loosen screws as in previous post and slide motor down slightly to achieve the above,suerely someone i your club would help you to do this,if you are still in the mire so to speak is there anyway you could post the hull up to me and I will GLADLY sort it out for you and also your electrics so you don't have to stress about it

Dave

DickyD · « **Reply #28 on:** May 09, 2012, 11:24:42 pm »

Dave how abouts he loosens off both grub screws and slides the coupling back to the prop shaft.

Circlip · « **Reply #29 on:** May 10, 2012, 10:17:03 am »

Funny thing with flats on between the Tube and the Huco hex looks a bit like a locknut to me?

Regards Ian.

Tug-Kenny RIP · « **Reply #30 on:** May 10, 2012, 11:25:57 am »

They are actually part of the insert and do not turn separately. This is what threw me in the first place. If the motor was loose, then these would pull out. I've magnified the coupling, see below

Any clubs down in Somerset you could visit and get advice ?

ken

jaymac · « **Reply #31 on:** May 10, 2012, 11:30:26 am »

Dave thanks ever so much for your kind offer but at nearly 40'' reluctant to risk posting
Ken there is a nut at the prop side of the coupling but NO grub screw. At the motor side there is only the grunb screw
heres another pic
Note if I remove the wire washer on the left then I can pull the prop shaft that amount out from the red sleeve which can then slide back an forth

Circlip · « **Reply #32 on:** May 10, 2012, 11:34:50 am »

No Ken, NOT the Huco hex, the bit you've marked as locknut. Jaymac has enlarged it again, the smaller of the two hex's tight up to the propshaft tube. Thought you meant it was the tube bush.

Regards Ian

Just looked again at the supersize, there is a packing sleeve between the small locknut and the copper washer, the brass tube. He may be able to take the copper washer out, loosen the huco and shaft locknuts and take the play up by screwing the shaft locknut further down the propshaft and relocking the Huco up to it. Needs the motor side grubscrew on the Huco to be loosened first to allow it to slide back towards the propshaft.

The sleeve is the thrust "Washer"

Tug-Kenny RIP · « **Reply #33 on:** May 10, 2012, 11:50:29 am »

Very interesting problem. I reckon that extra wire idea solves the problem as long as it's un-moveable. If its copper then you could use something stronger?

ken

oldiron · « **Reply #34 on:** May 10, 2012, 11:57:11 am »

Quote from: Circlip on May 10, 2012, 11:34:50 am

Just looked again at the supersize, there is a packing sleeve between the small locknut and the copper washer, the brass tube. He may be able to take the copper washer out, loosen the huco and shaft locknuts and take the play up by screwing the shaft locknut further down the propshaft and relocking the Huco up to it. Needs the motor side grubscrew on the Huco to be loosened first to allow it to slide back towards the propshaft.

The sleeve is the thrust "Washer"

Kinda sounds like the last paragraph i wrote along with the drawing.
The problem that is trying to be solved is what we go through to set up a prop shaft when we make an initial or new installation. As you and I have described, Ian, this is standard set up procedure.
The gentleman's vessel either, wasn't set up right to begin with, or something has shifted from construction. Either way its an easy straight forward fix.
John

Circlip · « **Reply #35 on:** May 10, 2012, 12:05:56 pm »

Yep, you got it so many posts back John, but as an extra Jaymac, when you reassemble, make sure the brass inserts with the largest hex on them are not slid out of the coupling but are the same depth as you show on the Photo. Problem was had the first photo been the last one shown, we could see the assembly more clearly.

First op is to loosen the grubscrew in the hex coupling at the MOTOR end.

Regards Ian.

Corposant · « **Reply #36 on:** May 10, 2012, 03:16:49 pm »

Jaymac

As Ian says, "First op is to loosen the grubscrew." Although this is something you say you cannot do, it shouldn't be too difficult. It is, however, crucial that you have the right sized Allen key. From your pictures, it appears there is plenty of room to get good leverage with the key. If the screw is rusty, it's worth applying a drop of oil but this shouldn't be necessary because it will be turning in brass.

With the grubscrew loosened, it will be easy to remove the motor - which, in turn, will give you access to all the other parts of the coupling.

You can then apply all the advice you've been offered!

Mike

jaymac · « **Reply #37 on:** May 10, 2012, 06:49:33 pm »

First to Ken Yes I have clubs in the area Woodspring or Clevedon I'm inPortishead but not really a Club type person
Next Iain I haven;t said I cant loosen the grubscrew Have not really tried that yet .Its the damn screw un the mounting plate under the propshaft I cant get at . And now just to infuriate me even more the same said screw has undone itself on the other Motor not a happy Bunny. Anyway thanks to all for theiir input I shall try and have a go at the W/end if push comes to shove I might give it a Vikings funeral on my own little pond

Oh one last point anyone any ideas what size spanners I'm looking for Fraid Ive always been aa Ajustable or Stilsons guy . Just a rough idea what range to get some in
Thanks
John

Corposant · « **Reply #38 on:** May 10, 2012, 07:31:15 pm »

Jaymac

Once you have loosened the grubscrew (which needs a 1.5mm A/F Allen key), then removing the screws marked by red arrows will give you easy access to everything else.

Mike

oldiron · « **Reply #39 on:** May 10, 2012, 10:13:14 pm »

.... or conversely, remove the red screws and slide the brass fitting out of the red Huco coupling along with the motor and mount. Remember , the red bit of the Huco joint is on a spline on the brass fitting and the brass bit will slide out easily. You can then tighten up the motor blue screws to your heart's content

the whole repair operation from the top shouldn't take more than 5 minutes...tops.

John

jaymac · « **Reply #40 on:** May 10, 2012, 10:28:59 pm »

or conversely, remove the red screws and slide the brass fitting out of the red Huco coupling along with the motor and mount. Remember , the red bit of the Huco joint is on a spline on the brass fitting and the brass bit will slide out easily.

Well thats just waht I was about ask to do it that way Yippee reason beiong I found some some brass fittings in the box and thought Ah1 Why not do it that way .Many ways to skin a cat it seems Thanks John
Mike Thanks for the Key size just in case

jaymac · « **Reply #41 on:** May 11, 2012, 11:00:13 pm »

OK I got the coupling off but as I said there is no grub screw at this end is there a thread inside the brass spline if not whats holding it onto the shaft other than the wee hexagonal behind the Big un

Stavros · « **Reply #42 on:** May 11, 2012, 11:07:18 pm »

Glad to see you have made some progress all you need now is a wahser behind the Small nut and it will be SORTED

Dave

jaymac · « **Reply #43 on:** May 11, 2012, 11:27:04 pm »

Aye but how do I get the nut off cant grasp how its attched to the spline dont want to snap anything turning what aint meant to turn as no grub screw or any sign of a thread anywhere

RAAArtyGunner · « **Reply #44 on:** May 11, 2012, 11:42:11 pm »

Guys,

Would there be a thread on the shaft fitting into a thread in the spline then Jaymac can unscrew the two "hexes" to get it apart.
The thread on shaft may not be visible, if lock nut has been screwed down onto the shaft, covering the thread, and spline tightened (screwed down) against it ?????????????????

Stavros · « **Reply #45 on:** May 11, 2012, 11:45:01 pm »

Right then use a spanner on the Brass coupling the one with the spline on it....it is one piece ,I think it is around 11mm and use a spanner on the small nut and unscrew them off the propshaft....as SIMPLE as that

Dave

jaymac · « **Reply #46 on:** May 11, 2012, 11:49:51 pm »

Cheers Dave I can see that just curious as how the shaft is screwed into the coupling when there is no apparent thread will have ago tomorrow

Stavros · « **Reply #47 on:** May 12, 2012, 12:00:35 am »

Go for it YOU can not damage the Brass coupling,,,,the one with the splines on it,whilst you have them off please take the oppertunity to grease the shaft with some ordinarry grease....OH dear me I have just started a grease war...sorry I honestly didnt mean to

Dave

RAAArtyGunner · « **Reply #48 on:** May 12, 2012, 12:01:30 am »

Jaymac,

My guess?? is that you can't see the thread because the lock nut, the small one has been undone down as far as it will go onto the shaft and therefore covers the thread end on the shaft, the coupling has been tightened against the lock nut so no thread visible anywhere.

One of the guys did mention that it may have been incorrectly installed, but hey I am only following the thread and like you and learning along the way.

Shipmate60 · « **Reply #49 on:** May 12, 2012, 12:04:18 am »

Looking at the image it looks like the coupling end and locknut are right at the end of the thread.
It looks like either the outer shaft has been cut or a longer shaft used.
In all honesty someone has made a right pigs ear of fitting the shaft.
To check it properly the other end needs stripping and then the shaft checking in the tube.
Failing that a 4mm washer could be used to take up the slack.

Bob

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Author Topic: Prop Shaft coupling seems loose (Read 17932 times)

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