Steam & Excursion > 4014 packing problems re-appeared?

Did the cylinder packing leak on 4014 get fixed then re-appear? I was just watching one of the latest videos and it looks like the left, front engine piston rod is blowing by again? I don't know why this keeps happening. Any info help for me?.....Thanx!

What, exactly, is cylinder packing?

Thanks.

I just watched a video from this morning I think, and it sure looks like it.
Hopefully, they will get it fixed during their stop.
Pat

wzd Wrote:
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> What, exactly, is cylinder packing?
>
> Thanks.

That is the "packing" around the piston rod that keeps the steam pressure from leaking out of the rear cylinder head. The "packing" is actually a two piece metallic design, manufactured by Paxton-Mitchel, and has been used for many, MANY decades. It sometimes may take some miles, and heavy loading, to properly break-in, and stop leaking.

Well, the miles may be there, but so much for heavy loading.

HotWater Wrote:
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> wzd Wrote:
> --------------------------------------------------
> -----
> > What, exactly, is cylinder packing?
> >
> > Thanks.
>
> That is the "packing" around the piston rod that
> keeps the steam pressure from leaking out of the
> rear cylinder head. The "packing" is actually a
> two piece metallic design, manufactured by
> Paxton-Mitchel, and has been used for many, MANY
> decades. It sometimes may take some miles, and
> heavy loading, to properly break-in, and stop
> leaking.

wzd Wrote:
-------------------------------------------------------
> What, exactly, is cylinder packing?
>
> Thanks.
I guess I should have worded it a little better. I meant what Jack said afterword: "The piston rod packing in the cylinder".

Also see: U.S. Metallic Packing Co. (former vendor),  among other manufacturers of metallic packing.
Trade mark used by USMP: “King”.

Some leakage can be related to the other sealing surfaces in the packing gland.
Part of the seating process, is full cylinder pressures, while working freight —- 300 PSI will help get the
“working packing” to seal up.  

 Its why, back in “the day”, that newly delivered engines were “loaded with trains to haul” and placed in service ..heavy-loading actually “seats things” more quickly than “taking it easy”...which is a temptation that’s hard to avoid.

All this extra shoving power is not helping the “ physics involved” in the break-in process.
If you’re using dismal & dynamic braking, BB needs more than 1 unit, to be effective in holding him back...

You can’t get to superheat temperatures without a “trailing-load” that matches the designed power-output that went into BB’s construction.   How else are you gonna ever get steam at  “superheat temperatures” into the cylinders?    You need superheated steam in the cylinders to help seat this style packing.

Also, as mentioned earlier, in today’s world, there are more and better alternatives for packing material resources & that seal right-away,  no ‘seating-in” process involved....way less expensive, too (not that THATS  important to this project).

Wes C.
 



Edited 9 time(s). Last edit at 05/06/19 17:19 by wcamp1472.

wcamp1472 Wrote:
-------------------------------------------------------
> Also see: U.S. Metallic Packing Co. (former
> vendor),  among other manufacturers of metallic
> packing.
> Trade mark used by USMP: “King”.
>
> Some leakage can be related to the other sealing
> surfaces in the packing gland.
> Part of the seating process, is full cylinder
> pressures, while working freight —- 300 PSI will
> help get the
> “working packing” to seal up.  
>
>  Its why, back in “the day”, that newly
> delivered engines were “loaded with trains to
> haul” and placed in service ..heavy-loading
> actually “seats things” more quickly than
> “taking it easy”...which is a temptation
> that’s hard to avoid.
>
> All this extra shoving power is not helping the
> “ physics involved” in the break-in process.
> If you’re using dismal & dynamic braking, BB
> needs more than 1 unit, to be effective in holding
> him back...
>
> You can’t get to superheat temperatures without
> a “trailing-load” that matches the designed
> power-output that went into BB’s construction.
>   How else are you gonna ever get to
> “superheat temperatures” into the cylinders?
>   You need superheated steam
> in the cylinders to help seat this style packing.
>
> Also, as mentioned earlier, in today’s world,
> there are more and better alternatives for packing
> material resources
> & that seal right-away,  no ‘seating-in”
> process involved....way less expensive, too
> ( not that THATS  important to this project).
>
> Wes C.
>  

Thanks for yet another very informative post Wes Camp. The knowledge you share is always very much appreciated.

Regards,
Mark V.
The Fort

Posted from iPhone

patd3985 Wrote:
-------------------------------------------------------
> Did the cylinder packing leak on 4014 get fixed
> then re-appear? I was just watching one of the
> latest videos and it looks like the left, front
> engine piston rod is blowing by again? I don't
> know why this keeps happening. Any info help for
> me?.....Thanx!

I think the 844 also has this issue, although it's spraying lube oil/grease all over the second pilot axle and first driver axle.

Posted from Android

wzd Wrote:
-------------------------------------------------------
> What, exactly, is cylinder packing?
>
> Thanks.

Just a point of clarifiaction ( that I had missed earlier..)

There are two areas in cylinders that have seals applied (packing): 
'Cylinder packing'  is the name for the spring-expanded piston rings, ---- that seal the large diameter piston against the cylinder's wall, proper.

'Piston Rod packing, is the sealing material, and seals, that surround the piston rod  --- that extends through the cylinder head. 

Hope this helps..

W.

 

"Pistol-Packin' Mama" is totally unrelated to railroads. :D

Am sure they would rather have had time for a good break in run but hey am glad that its on the rails may not be perfect and they wont have time to make it that way either until after the event.