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More Parsons gearbox trouble

luctor et emergo
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Timleech Veteran II

Timleech

Posted
Posted (edited)

Oh. That would put the thrower on the input shaft side of the flange, it was bodged onto the output shaft side last time

 

Richard

 

The drawing such as it is in the book seems to suggest that the thrower was formed (punched) into the holes before rivetting. Sort of makes sense as it would mean that the rivets themselves were not constantly in shear, must have been a bit of a fiddle to get right though.

 

I think if you made the new centre big enough, you would get away from the fatigued area.

 

 

Tim

 

ETA that the countersinks were apparently facing forwards originally.

 

Tim

Edited by Timleech
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Timleech Veteran II

Timleech

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Posted

That wretched Bizzard

 

A 99p aluminium IKEA frying pan is almost exactly the same size...

 

Richard

 

How do you secure the aluminium pan reliably to the centre?

 

Rivetting is probably the only way....

 

Tim

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RLWP Veteran II

RLWP

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Posted

How do you secure the aluminium pan reliably to the centre?

 

Rivetting is probably the only way....

 

Tim

 

See, now you've caught it too - Bizzarditis

 

Richard

 

A few copper rivets, or perhaps a threaded plate with some countersunk screws

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Timleech Veteran II

Timleech

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Posted

See, now you've caught it too - Bizzarditis

 

Richard

 

A few copper rivets, or perhaps a threaded plate with some countersunk screws

 

Not really. Not knowing how a 99p aluminium pan would respond to being spun at maybe 2000 rpm, I think I'd prefer to do it in steel by welding in a new centre. I might experiment beforehand with trying to reproduce the original securing method of (apparently) forming the steel sheet into the csk holes & then rivetting. Also you know the shape will fit ;)

 

Tim

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RLWP Veteran II

RLWP

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Posted

I need a lay down..

 

That must have made a horrible sound. I would have ;-o

 

<snip>

 

No noise at all. The puller I used is a hydraulic one, it took the best part of an hour to pull that off

 

Richard

 

Not really. Not knowing how a 99p aluminium pan would respond to being spun at maybe 2000 rpm, I think I'd prefer to do it in steel by welding in a new centre. I might experiment beforehand with trying to reproduce the original securing method of (apparently) forming the steel sheet into the csk holes & then rivetting. Also you know the shape will fit ;)

 

Tim

 

How about using one of those pans that Bizzard uses to poach steel eggs?

 

Richard

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alan_fincher Veteran II

alan_fincher

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I think you have already worked that out, but I have a manual in front of me that definitely confirms that the only difference between a Type D and Type DA box, is the use of an aluminium casing for the latter.

 

I also have a limited amount of stuff here on a Type B box.

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Timleech Veteran II

Timleech

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I think you have already worked that out, but I have a manual in front of me that definitely confirms that the only difference between a Type D and Type DA box, is the use of an aluminium casing for the latter.

 

I also have a limited amount of stuff here on a Type B box.

 

It might be worth a call to Parsons Matthway just in case they have an oil thrower on the shelf. I've no idea what they do keep, it wasn't much 25 years ago, but apparently they do still offer some level of support.

I have an address here of Mercury Yacht Harbour, Satchell Lane, Hamble, Southampton, but that is from 1978!

 

My F type manual also covers the B type.

 

Tim

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alan_fincher Veteran II

alan_fincher

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My F type manual also covers the B type.

Yes,

 

I have an undated "Parsons Types B & F Installation and Maintenance Guide", but also a 1960 Perkins produced offering "Mechanical Marine Gear Boxes Types D, DA & F as fitted to Perkins Diesel Engines". The latter doesn't actually mentioned "Parsons" but that's what the gearboxes actually were, of course.

 

For this particular problem, I don't think either will add much to what Richard has already worked out, though.

Edited by alan_fincher
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luctor et emergo Veteran II

luctor et emergo

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I emailed Parsons Pathway Marine when the box first broke, but heard nothing back. Will try again after I had some sleep.

 

Thanks all, for your intersest and advice. And Bizzard, keep the cheap solutions coming, you never know, one of might just strike gold... :cheers: I f not, at least they cheer me up.

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RLWP Veteran II

RLWP

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Posted

This gearbox is way out of adjustment. I'll take some photos to explain

 

Basically, it doesn't lock in either forward or reverse. Well, didn't, it locks in reverse OK now

 

Richard

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bizzard Veteran II

bizzard

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Posted

I emailed Parsons Pathway Marine when the box first broke, but heard nothing back. Will try again after I had some sleep.

 

Thanks all, for your intersest and advice. And Bizzard, keep the cheap solutions coming, you never know, one of might just strike gold... :cheers: I f not, at least they cheer me up.

A private consultation with George Foreman and Antony Worrel-Thompson or Nicholas Parsons about pots and pans may be called for. :closedeyes:

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