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Drive coupling

Traveller

By Traveller
in Boat Building & Maintenance

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Traveller Rising Star

Traveller

Posted
Posted

The drive coupling on my boat is starting to look a little worn. It is not too bad but now would seem an ideal time to source a spare. Trouble is I cannot find one - it is a Metalastic coupling. Part number 21/642/2

 

Any ideas out there?

 

Thanks

Colin

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David Mack Veteran II

David MackDonate to Canal World

Posted
Posted
6 hours ago, Traveller said:

The drive coupling on my boat is starting to look a little worn. It is not too bad but now would seem an ideal time to source a spare. Trouble is I cannot find one - it is a Metalastic coupling. Part number 21/642/2

 

Any ideas out there?

 

Thanks

Colin

Is your coupling the same as fitted to large GU motors? Previous thread:

 

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Arthur Marshall Veteran II

Arthur Marshall

Posted
Posted

If it's anything like this, I tried to find a replacement a couple of years ago after it got damaged taking the gearbox out.  I did find someone who could make it for me, but they quoted £900 and would only make two at a time, so you had to buy them both.  Cheaper to replace the whole chunk of sterngear...

After having a good look at it at a boatyard, we all decided there was enough rubber left on it, I got a local  vulcanising firm to fill the chunks we'd ripped out with rubber stuff, and put it back.

coupling (2).jpg

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bizzard Veteran II

bizzard

Posted
Posted (edited)

The Ford Granada propshaft doughnut fits the Lister LH150, LM100 6 bolt half couplings perfectly, but you need a couple of inches more spare shaft to fit one to make it universal and flexible and in isolation to prevent transmitted noise, by using nuts and bolts by 3 and 3 opposites, 3 one way and 3 the other, using spacers between.

Edited by bizzard
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ditchcrawler Veteran II

ditchcrawlerDonate to Canal World

Posted
Posted
2 hours ago, Arthur Marshall said:

If it's anything like this, I tried to find a replacement a couple of years ago after it got damaged taking the gearbox out.  I did find someone who could make it for me, but they quoted £900 and would only make two at a time, so you had to buy them both.  Cheaper to replace the whole chunk of sterngear...

After having a good look at it at a boatyard, we all decided there was enough rubber left on it, I got a local  vulcanising firm to fill the chunks we'd ripped out with rubber stuff, and put it back.

coupling (2).jpg

I have just walked past a coupling like that, but I think its a bit bigger, on a scrap heap. What sort of diameter is it as I am not searching the threads to find out.

 

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Arthur Marshall Veteran II

Arthur Marshall

Posted
Posted
2 hours ago, ditchcrawler said:

I have just walked past a coupling like that, but I think its a bit bigger, on a scrap heap. What sort of diameter is it as I am not searching the threads to find out.

 

I'll nip down tomorrow and get the measurements - I can't find either the original thread or my measurements, but would appreciate you keeping an eye on the scrapheap! 

4 hours ago, bizzard said:

The Ford Granada propshaft doughnut fits the Lister LH150, LM100 6 bolt half couplings perfectly, but you need a couple of inches more spare shaft to fit one to make it universal and flexible and in isolation to prevent transmitted noise, by using nuts and bolts by 3 and 3 opposites, 3 one way and 3 the other, using spacers between.

I seem to remember there was a reason we couldn't do this, I think probably because of the propshaft which is tapered to fit this particular coupling. 

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bizzard Veteran II

bizzard

Posted
Posted
9 minutes ago, Arthur Marshall said:

I'll nip down tomorrow and get the measurements - I can't find either the original thread or my measurements, but would appreciate you keeping an eye on the scrapheap! 

I seem to remember there was a reason we couldn't do this, I think probably because of the propshaft which is tapered to fit this particular coupling. 

Judging by your photo Arthur you haven't enough spare gap on the shaft either.

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ditchcrawler Veteran II

ditchcrawlerDonate to Canal World

Posted
Posted
32 minutes ago, bizzard said:

The diameter for the Lister LH150, lm100 half coupling  and that rubber coupling is 5''  Distance between two bolt holes 2. 1/8''

I will take the camera and tape measure tomorrow but I think its bigger

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RLWP Veteran II

RLWP

Posted
Posted

Do post dimensions, I think I saw some of those recently in a pile of spares we are taking on

 

They were certainly for a Lister, not sure if it was a big or small one though

 

Richard

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ditchcrawler Veteran II

ditchcrawlerDonate to Canal World

Posted
Posted
20 minutes ago, Traveller said:

No disrespects but I start a thread asking for help and it gets hijacked. I do not mind sharing but if somebody came up with a spare who’s would it be mine or Arthur’s?

Surly that is up to who ever owns it.

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Tony Brooks Veteran II

Tony BrooksDonate to Canal World

Posted
Posted
29 minutes ago, Traveller said:

No disrespects but I start a thread asking for help and it gets hijacked. I do not mind sharing but if somebody came up with a spare who’s would it be mine or Arthur’s?

So you ignore the request for a photo, give an obsolete part number and then complain when the thread diverges. Is that good forum etiquette?  Topics always wander off subject and people join in etc. As I have said before if you want exclusive answers to your question then pay a consultant who will only answer to you.

 

I strongly suspect yours and Arthur's couplings are different so  the person's installation it fits gets it.

 

Sorry, I have no idea whereto get a new one from but just about might if I knew what it looked like.

 

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