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I was going to include a single photo but apparently it's bigger than 2.93MB🤔

The 2 studs on the collar that compress the packing each have 2 nuts (to lock in place) but I wondered if it's possible to obtain Whitworth gauge Nylock nuts, as this would allow another piece of packing by using the space taken up by the present 2nd nut, if you get my meaning.

Edited by jenevers
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Systems with lock nuts normally have the adjusting nut and lock nut on the same side of the pusher so has someone put the locknut on the wrong side of the pusher. It may be the studs undid themselves when adjusting so rather than Locktite them in place someone has used locknuts gainst the gland housing.

Edited by Tony Brooks
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Whitworth nylocs can be had, reasonably easily (more easily than BSF anyway). What size do you want?  I may have some.

 

Otherwise you will need a specialist nut and bolt supplier or engineers  merchant and may have to buy more than you need.  Try Orbital Fasteners, Allfix, Namrick (dear but do small packages) or Wentin Fasteners.

N

 

 

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Posted (edited)
1 hour ago, Tony Brooks said:

Systems with lock nuts normally have the adjusting nut and lock nut on the same side of the pusher so has someone put the locknut on the wrong side of the pusher. It may be the studs undid themselves when adjusting so rather than Locktite them in place someone has used locknuts gainst the gland housing.

This is why I wanted to include a photo. The nuts are  on the same (out)side of the flange. So because there are 2 on each stud using up thread, the flange is 1 nut nearer to the housing than it needs to be. If I had a single Nylock nut on each stud the pusher would be further out from the propshaft tube and I could get another ring of packing in.

46 minutes ago, BEngo said:

Whitworth nylocs can be had, reasonably easily (more easily than BSF anyway). What size do you want?  I may have some.

 

Otherwise you will need a specialist nut and bolt supplier or engineers  merchant and may have to buy more than you need.  Try Orbital Fasteners, Allfix, Namrick (dear but do small packages) or Wentin Fasteners.

N

 

 

I just need 2 x 9/16 whitworth nuts. I’ll check those merchants out 👍 

On 2nd thoughts, a couple of spring washers would do the trick🙂

Edited by jenevers
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2 minutes ago, Tracy D'arth said:

Sure they are whit and not UNC?

 

If you have 3 pieces of packing in, that will last for 10 to 20 years, why do you need more?

Because there’s room and I have a spare piece of packing, so why not?

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32 minutes ago, jenevers said:

This is why I wanted to include a photo. The nuts are  on the same (out)side of the flange. So because there are 2 on each stud using up thread, the flange is 1 nut nearer to the housing than it needs to be. If I had a single Nylock nut on each stud the pusher would be further out from the propshaft tube and I could get another ring of packing in.

 

x 9/16 whitworth nuts. I’ll check those merchants out 👍 

On 2nd thoughts, a couple of spring washers would do the trick🙂

9/16 whit is bigger than any stern gland pusher thread I have ever seen. The nuts will be about an inch AF.   The thread is  sized by outside diameter, not the nut size.

 

  Is the 9/16 the nut AF ?  If so they are more likely to be UNC as Tracy suggests, or possibly 5/16 WW.

 

N

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2 hours ago, BEngo said:

9/16 whit is bigger than any stern gland pusher thread I have ever seen. The nuts will be about an inch AF. 

Sounds about right for a Big Woolwich.

 

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The longer nuts could be heated to dull red and squeezed very very slightly in a vice to make them very slightly oval. Oval nuts are used in some automotive applications for  self locking .

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Posted (edited)
23 hours ago, BEngo said:

9/16 whit is bigger than any stern gland pusher thread I have ever seen. The nuts will be about an inch AF.   The thread is  sized by outside diameter, not the nut size.

 

  Is the 9/16 the nut AF ?  If so they are more likely to be UNC as Tracy suggests, or possibly 5/16 WW.

 

N

The spanner has “9/16W” stamped on it

23 hours ago, springy said:

Unless the boat has significant age I would expect to find metric threads on the cap bolts.

 

springy

87 years old. 

Edited by jenevers
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51 minutes ago, jenevers said:

The spanner has “9/16W” stamped on it

87 years old. 

 

That's probably old enough, and 9/16 W is just over an inch across the flats, them's big nuts !

 

springy

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Posted (edited)

Continuing the topic. A strange observation was that the "pusher" had worked its way aft and away from the flange nuts, as if by suction. So the nuts weren't actually holding the pusher against the packing. There was a gap between the nuts and the flange. Anyone else

had this happen?

On 01/05/2021 at 16:25, Tony Brooks said:

 

 

Edited by jenevers
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On 02/05/2021 at 16:52, jenevers said:

The spanner has “9/16W” stamped on it

87 years old. 

Even older than my Big Woolwich (84 years old last December).

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4 hours ago, jenevers said:

Continuing the topic. A strange observation was that the "pusher" had worked its way aft and away from the flange nuts, as if by suction. So the nuts weren't actually holding the pusher against the packing. There was a gap between the nuts and the flange. Anyone else

had this happen?

 

I'd have thought it more likely that the nuts had slackened off and unwound themselves a bit.

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40 minutes ago, bizzard said:

Squeeze yer nuts.

 

As he is unlikely to get new nuts very easily and they are a large size I think he may be better to stake the top of the nuts.

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2 hours ago, Iain_S said:

I'd have thought it more likely that the nuts had slackened off and unwound themselves a bit.

No they hadn't. The flange was right up against the bulkhead.

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2 hours ago, Tony Brooks said:

 

As he is unlikely to get new nuts very easily and they are a large size I think he may be better to stake the top of the nuts.

I'm going for star washers.

 

 

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The nuts are likely on studding, can you get the studding out and replace it with slightly longer lengths?

 

...........Dave

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