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 Post subject: A bad day for SP #18
PostPosted: Tue Apr 09, 2019 8:10 pm 

Joined: Thu Oct 21, 2004 7:24 am
Posts: 515
Location: Canada
Narrow Gauge SP 4-6-0 #18 on loan to the Durango and Silverton blew a cylinder head, ...she’ll be out for a while.


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Last edited by Finderskeepers on Tue Apr 09, 2019 8:15 pm, edited 1 time in total.
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 Post subject: Re: A bad day for SP #18
PostPosted: Tue Apr 09, 2019 8:14 pm 

Joined: Thu Oct 21, 2004 7:24 am
Posts: 515
Location: Canada
Another view


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 Post subject: Re: A bad day for SP #18
PostPosted: Tue Apr 09, 2019 8:39 pm 
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Joined: Tue Feb 20, 2018 7:08 pm
Posts: 64
Location: Alberta, Canada
My goodness! I hope no one was hurt.

Any idea as to what happened, or is it too early to say?

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 Post subject: Re: A bad day for SP #18
PostPosted: Tue Apr 09, 2019 9:31 pm 

Joined: Fri Aug 20, 2010 8:25 pm
Posts: 297
That's unfortunate. Looks like a nice clean break in the casting. No clear sign of a prior crack/flaw.

Looks like a hydraulic failure, someone forgot to open the cylinder cocks, or the cocks were plugged ?

Good luck, Kevin


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 Post subject: Re: A bad day for SP #18
PostPosted: Tue Apr 09, 2019 10:02 pm 

Joined: Mon Aug 23, 2004 10:49 am
Posts: 674
NYCRRson wrote:
That's unfortunate. Looks like a nice clean break in the casting. No clear sign of a prior crack/flaw.

Looks like a hydraulic failure, someone forgot to open the cylinder cocks, or the cocks were plugged ?

Good luck, Kevin


I'm thinking if it had been water in the cylinders it would have blown the entire head off. I'm thinking something else let go and the piston overtraveled into the cylinder head.


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 Post subject: Re: A bad day for SP #18
PostPosted: Tue Apr 09, 2019 10:11 pm 

Joined: Thu Oct 21, 2004 7:24 am
Posts: 515
Location: Canada
https://durangoherald.com/articles/2716 ... of-durango


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 Post subject: Re: A bad day for SP #18
PostPosted: Tue Apr 09, 2019 10:16 pm 

Joined: Sat Feb 06, 2010 9:29 am
Posts: 240
Looks like the piston came loose and hit the head....very similar to the damage incurred on the hiesler that was running in Arizona in '09...rod end came off, piston hit the head, blew the cover off and shattered the head....
If you look close, there's probably cracks radiating from the center hole....


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 Post subject: Re: A bad day for SP #18
PostPosted: Tue Apr 09, 2019 10:22 pm 

Joined: Thu Oct 21, 2004 7:24 am
Posts: 515
Location: Canada
Whatever happened, it does not look as simple as someone forgot to open the cylinder cocks. Looks like the piston itself shattered as well as the head...appears something worked loose allowing the piston to contact the cylinder head.


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 Post subject: Re: A bad day for SP #18
PostPosted: Tue Apr 09, 2019 11:30 pm 

Joined: Sun Aug 22, 2004 7:19 am
Posts: 5630
Location: southeastern USA
Well, if it had to happen it happened at a railroad with a shop more than capable of dealing with this kind of relatively simple repair. I'm sure the D&S will have her back in service soon after they get the castings from the foundry.

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 Post subject: Re: A bad day for SP #18
PostPosted: Wed Apr 10, 2019 8:53 am 

Joined: Tue Aug 22, 2017 11:27 am
Posts: 31
That's not something you see everyday even in the steam era. However in today's world it is a WOW event.


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 Post subject: Re: A bad day for SP #18
PostPosted: Wed Apr 10, 2019 12:25 pm 

Joined: Sun Jun 23, 2013 1:16 pm
Posts: 91
The piston fragments show that they struck each other as the thing disintegrated, and that tells me that the cylinder bore got gouged and roughed up by those big chunks as they hammered the cylinder head.

I see a boring machine in that engines future.


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 Post subject: Re: A bad day for SP #18
PostPosted: Wed Apr 10, 2019 12:55 pm 

Joined: Sun Aug 22, 2004 8:51 pm
Posts: 1655
Location: Southern California
This thread on the NGDF contains a number of images showing the damage, etc.:

SP 18 run, piston failure, and rescue 4-9-19

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 Post subject: Re: A bad day for SP #18
PostPosted: Thu Apr 11, 2019 1:22 am 

Joined: Mon Jul 02, 2018 8:04 pm
Posts: 57
I was riding this train during the break down. Official cause was a broken lubricator.


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 Post subject: Re: A bad day for SP #18
PostPosted: Thu Apr 11, 2019 3:41 pm 

Joined: Fri Dec 03, 2004 9:42 pm
Posts: 2576
Tom F wrote:
I was riding this train during the break down. Official cause was a broken lubricator.


Surprised they've nailed it down so fast. However, I suppose the lack of lubrication could have caused the piston to bind up, which caused it to slide on the piston rod or do something that effectively made the piston rod longer than it should be by moving some adjustment point. That could in turn cause it to strike the cylinder heard. So it's seems plausible that's what happened.


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 Post subject: Re: A bad day for SP #18
PostPosted: Thu Apr 11, 2019 4:35 pm 

Joined: Sat Feb 02, 2013 3:55 pm
Posts: 31
Per Jeff Taylor post on NGDF...

"Here is the inside scoop. It is believed that a partial ring failure caught a port and destroyed the piston. The piston fragments then punched a hole in the cylinder head."

More information can be found at their forum.


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