Cylinder Cocks Issue (Video)- Any Suggestions?

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Shlick88
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Cylinder Cocks Issue (Video)- Any Suggestions?

Post by Shlick88 » Sun Jul 21, 2019 8:53 pm

The work on my Pacific continues...Today I went ahead and steamed up on rollers to check out a few things I've been working on. Unfortunately my line from the injector to the boiler still has leaks, but that's a different story. However, I had one side of the engine the appeared to have cylinder cocks working correctly while the other seemed to have issues. Curious if you guys have any suggestions on where to start or what you think the issue could be?

Video link below.

Thanks in advance!

https://vimeo.com/349364818
Burlington Little Line
4-6-2 Pacific 1.5"
Omaha, NE

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NP317
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by NP317 » Sun Jul 21, 2019 9:27 pm

One valve and joint at a time.

Make a list of the identified problems, and work your way through until all are fixed.
I just completed the first page of five, of tasks to get a steam project running.
RN

Harold_V
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by Harold_V » Mon Jul 22, 2019 1:34 am

Are you sure it's a cylinder cock problem? Judging from the erratic performance and lack of steam, I wonder if, maybe, the cylinder in question isn't getting steam?

H
Wise people talk because they have something to say. Fools talk because they have to say something.

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Joe Tanski
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by Joe Tanski » Mon Jul 22, 2019 6:52 am

if you close the cylinder cocks does the engine run smooth in forward and reverse, if not its a timeing problem!!!
Joe

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Fred_V
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by Fred_V » Mon Jul 22, 2019 7:39 am

I agree, It's not getting steam to the right side cylinder.
Fred V
Pensacola, Fl.

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LVRR2095
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by LVRR2095 » Mon Jul 22, 2019 7:45 am

If you think it is a cylinder drain issue....the test is very simple. Take all of the cylinder cocks off the locomotive and steam test again.
I suspect that the other posters are correct however....and there is no steam getting to the right side cylinder.

Keith

Mike Walsh
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by Mike Walsh » Mon Jul 22, 2019 8:57 am

Not sure why the suspicion is that the E/S cylinder is not receiving steam. It is evident that it is getting steam due to steam wisping from the piston/valve rod glands. It does seem very sticky... Do the cylinder cocks open as they should be? When open, do they seem to exhaust an equal amount of steam on all 4 events? Does the timing still seem square even with the cylinder cocks open?

The video does not tell the full story... But it is a start.

Harold_V
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by Harold_V » Mon Jul 22, 2019 3:39 pm

Mike Walsh wrote:
Mon Jul 22, 2019 8:57 am
Not sure why the suspicion is that the E/S cylinder is not receiving steam. It is evident that it is getting steam due to steam wisping from the piston/valve rod glands. It does seem very sticky...
I made that observation, but, coupled with the fact that it is sticky, it caused me to wonder if the cylinder is getting any of the steam, which could be the reason it behaves as if it's sticky. That steam gets to the valve doesn't guarantee that it gets to the cylinder.

H
Wise people talk because they have something to say. Fools talk because they have to say something.

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cbrew
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by cbrew » Mon Jul 22, 2019 8:33 pm

at the beginning of the video, its very clear all four corners is getting steam. what type of rollers do you have it on. it sure seems to have a lot of drag. that said, you are asking about the cocks.
questions,
1) was the cock supposed to be open or closed?
2) are they manual, steam or "automatic"?

but just from observations, the cocks likely need to be disassembled, cleaned and inspected.
If it is not live steam. its not worth it.

Mike Walsh
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by Mike Walsh » Mon Jul 22, 2019 10:02 pm

Entirely possible that it is not on rollers... If not on rollers, I believe that the valve gear is slightly out of sync because of lower driver centers (due to no weight on the suspension). But it could all be a little sticky due to dry oil in the cylinder/valves, etc... right?

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Fred_V
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by Fred_V » Tue Jul 23, 2019 8:04 am

It is getting a tiny bit of steam to the right side. It is as though the valve never gets off neutral so it cracks open and then shuts.
Fred V
Pensacola, Fl.

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LVRR2095
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Re: Cylinder Cocks Issue (Video)- Any Suggestions?

Post by LVRR2095 » Tue Jul 23, 2019 8:28 am

It is hard to see in the video.....but it looks like the die block is at the bottom of the expansion link on the fireman’s (left) side....but the die block is in the middle of the expansion link on the right side. If the lifting lever is pinned to the cross shaft and the pin has broken, you would have the left side doing all of the work while the right side remains in Neutral. Any chance of getting a side view while the loco is running on steam or air?

Keith

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