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Weighshaft taper pin

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Post  Schteamer Wed 26 Jun 2019, 3:34 pm

Hi, I have had a failure of the taper pin connecting the left hand lever to the weighshaft.

It snapped at either side of the shaft such that the lever arm could rotate.

Has anybody else seen this?

Any thoughts on preventative measures please.

Schteamer

Number of posts : 5
Location : NN13 5NF
Registration date : 2019-02-06

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Post  Mark the spark Wed 26 Jun 2019, 4:07 pm

You could always drill and tap a small grub screw underneath out of sight and lock it up once you put the new taper pin in

Mark the spark

Number of posts : 389
Location : Edinburgh
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Post  Schteamer Wed 26 Jun 2019, 4:56 pm

Thanks mark, great idea.

Schteamer

Number of posts : 5
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Post  Simon C Wed 26 Jun 2019, 6:27 pm

Schteamer wrote:Hi, I have had a failure of the taper pin connecting the left hand lever to the weighshaft.

It snapped at either side of the shaft such that the lever arm could rotate.

Has anybody else seen this?

Any thoughts on preventative measures please.
I had the same problem just 3 weeks ago just before the boiler inspector was due a visit.
I replaced the pin with an imperial equivelant. just had to put a taper reamer in first.
I decided not to toughen the pin any further than designe because the pin broke for a reason! so if I make it tuffer what will break next.
As yet I havent descovered the reason for the breakage, but when I do I will first repair then let you in in my findings.
The reversing lever works smoothley with the crank in any position and I have taken the LP chest cover off at full steam and found no issues so at the moment I am at a loss.
Just to add intregue to the issue I have had several sucsefull steaming since the breakage and had no problems.
Simon
Simon C
Simon C

Number of posts : 303
Location : Derby
Registration date : 2017-07-07

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Post  Schteamer Thu 27 Jun 2019, 4:51 pm

Thanks Simon, interesting to learn it isn't just me.

I was at a pub about 5 miles from home when i discovered it and had to do a fix on the fly by stealing one of the pins from the handbrake collars.

After I replaced it, it ran fine for the rest of the day.

I wonder if it just fatigues due to vibration.

It maybe just a maintenance item that needs replacing once per year as a preventative measure. I can't see any evidence that there has been an event that caused a catastrophic failure.



Schteamer

Number of posts : 5
Location : NN13 5NF
Registration date : 2019-02-06

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Post  Steve Traill Fri 28 Jun 2019, 11:58 pm

I don't think it's fatigue, Tim & I have done 250 odd miles on Frederick and that's not caused a problem. We have had a few bits drop off but usually 'Frederick' catches them somewhere so we can put them back on later!
Steve Traill
Steve Traill

Number of posts : 800
Age : 67
Location : Illogan Redruth Cornwall
Registration date : 2008-06-29

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