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Rebuilding Marsh Steam Pump


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  #11  
Old 06-14-2018, 12:52:24 PM
Sloroll Sloroll is offline
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Default Re: Rebuilding Marsh Steam Pump

https://www.lehmans.com/product/repl...or-water-pumps Says they have leathers for any pump. Good luck. I am following as I am also about to tear into a Marsh BB.
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  #12  
Old 06-14-2018, 05:46:04 PM
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Steve Kunz Steve Kunz is offline
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Default Re: Rebuilding Marsh Steam Pump

[QUOTE=Sid Pileski;Now I just have to get the water pump side leather cups made.
I made one a couple of weeks ago that turned out well. If I could find a source for them, that would save some time too.
Anyone know a good source for those? The diameter is 1.437.
Couldn't be a nice number like 1.375 or 1.5!! Sid[/QUOTE]


Do you have a picture of the leather cups? I thought that they were a bunch of leather discs stacked together?
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  #13  
Old 06-14-2018, 11:37:16 PM
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20 Reeves Highwheeler 20 Reeves Highwheeler is offline
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Default Re: Rebuilding Marsh Steam Pump

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Originally Posted by Steve Kunz View Post
Do you have a picture of the leather cups? I thought that they were a bunch of leather discs stacked together?
Steve, I agree with you. The ones in our Marsh type B used stacked leathers. It's been 25+ years since I made mine, but I took conveyor belting, found a large outer size hole saw that was slightly larger. After drilling those, I got a smaller size that was the diameter of the inner part of the pump. If I'd had leather at that time, I'd probably have used leather. But the disks I made stacked up and did the job. Gary
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  #14  
Old 06-15-2018, 01:52:39 AM
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JBoogie JBoogie is offline
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Default Re: Rebuilding Marsh Steam Pump

When I rebuilt mine it had phenolic/micarta for the water side piston. Which is probably the absolute worst material they could have used for that purpose. Why??? Because 1) if you've ever machined it, it's abrasive, and will wear out cutters if you run them even kind of fast or feed them a little hard. 2) it absorbs water and swells.

So they pretty much built these things with a built in expanding lap, that will wear shoulders in the bore and raise all types of holy hell when you try to get the damned thing out.

I used some type of plastic for the replacement (nylon, Teflon, UHMW??? Don't remember but I researched it first ) and designed it to have O-rings to seal it which should last a good long while, given the bore isn't tore up with long scratches.

The checks are not at all hard to remachined and lap and are pretty much dummy proof. HOWEVER! If there is any wear at all in the steam side it WILL NOT run. They can be repaired but at that point it may be best to cut your losses and sell it to me, especially if it is a smaller one.....

Some but not all joking aside, check to see that it will cycle before going crazy on the water side as that is the easy part to repair and even if that is in tip top shape it won't run if there is much wear at all on the steam side.

Marsh pumps are a paradox. Elon came up with a deceivingly simple design with a minimum of moving/wearing parts but for it to perform AT ALL it needs to be dead nuts..... much like a governor.
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Old 06-15-2018, 09:39:07 AM
Sid Pileski Sid Pileski is offline
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Default Re: Rebuilding Marsh Steam Pump

Thanks for the input.
The pump was running when I got it. It was fairly clean too.

I do stand corrected in that the pump bore ID is 1.375. That might make finding a cup seal a little easier.
The leather disintegrated pretty much and I've thrown it out, but it was definitely a cup.
Now, that may not be what it was originally designed with, but that's what it had. Maybe at some point it was modified in it's life???.

Here are some pictures:


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Old 06-16-2018, 11:10:03 PM
Brad Kelley Brad Kelley is offline
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Default Re: Rebuilding Marsh Steam Pump

Sid, I've never seen a Marsh like that before. It may be a very early design?

My Marsh "B" quit running this April at steam school. It would run 1 direction and stop, and I'd have to push the starter pin to get it going the other direction. I just took it apart to clean all the valve passages. Seems to run fine on air now.
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Old 06-16-2018, 11:19:24 PM
Brad Kelley Brad Kelley is offline
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Default Re: Rebuilding Marsh Steam Pump

My pump has also been getting harder to prime over the years. I had made the water piston out of 2 wraps of teflon packing rope. It worked pretty well for almost 10 years, but when I took the pump apart to clean the steam valve I saw the packing was crumbling. (Old packing on the left)

I'm looking at a different pump piston design, using the leather disk method. I made my own punch on the lathe and dad got some leather from Hobby Lobby, about 1/8" thick. I'm going to try 2 disks sandwiched between the solid teflon rings. Maybe just need a stack of leather disks, but we'll see.
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Old 06-17-2018, 12:59:56 PM
Glenn Gieszler Glenn Gieszler is offline
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Default Re: Rebuilding Marsh Steam Pump

I wonder if anyone has ever seen an original water side sealing ring
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Old 06-17-2018, 04:08:54 PM
DianneB DianneB is offline
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Default Re: Rebuilding Marsh Steam Pump

I found a good range of cast iron rings at a large hydraulic company that rebuilds cylinders and valves. I was astounded by the vast array of sizes they had in stock! (And cheap too!)
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Old 06-18-2018, 12:04:38 PM
Sid Pileski Sid Pileski is offline
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Default Re: Rebuilding Marsh Steam Pump

Quote:
Originally Posted by Brad Kelley View Post
Sid, I've never seen a Marsh like that before. It may be a very early design?

My Marsh "B" quit running this April at steam school. It would run 1 direction and stop, and I'd have to push the starter pin to get it going the other direction. I just took it apart to clean all the valve passages. Seems to run fine on air now.
I've been searching the web, and have not seen this style either.
My air dome (or what ever you call it) only has two bolts. All of the ones I've seen have four.
Parts should be in this week. Hopefully, I can set it back together.

Thanks, Sid
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