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BOILER BUILDING + Other Projects by STEAMHEATON
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   BOILER BUILDING + Other Projects by STEAMHEATON
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   Author  Topic: BOILER BUILDING + Other Projects by STEAMHEATON  (Read 31358 times)
ErieAtlantic7597
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #1040 on: Dec 30th, 2011, 10:41am »
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   Bill, I have to go along with Tom. That is some neat work there. And also, to go along with Tom, what does hold the piston nut tight. Also, I was wondering what is the amount of "squish" on the 'O' ring behind the solid piston rings?  I guess what I'm asking is, how much out ward force is there against the cylinder wall by the ring? I find this very interesting. Thanks so much for all the pictures and descriptions of the whole process.
 
   Hope to see you soon,
   
   Bruce


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ng_2-4-2
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #1041 on: Dec 31st, 2011, 6:18am »
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Bruce and Tom,
The backing o-ring is compressed about .040" against the teflon ring.  The teflon ring is about .020 over size.  In this case it is about 2.520".  It is compressed to 2.490" with a ring compressor and while being compressed, the piston is inserted into the the cylinder.  The compression of the o-ring keeps pressure on the teflon ring giving the seal against the cylinder wall.  
 
Here is a drawing of the end of the rod.  The piston is first threaded on to the rod against the shoulder and the jam nut keeps it from backing off.


http://Forums.Railfan.net/Images/LiveSteam/PistonDwg01.jpg
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« Last Edit: Dec 31st, 2011, 6:24am by ng_2-4-2 » Logged

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dgmarklin
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #1042 on: Dec 31st, 2011, 7:28pm »
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Those are looking great!  It's really cool to see how they go together.  
I didn't realize Ray's engine had aluminum pistons, sorta odd to me. Even with them out of line and leaky, that engine could pull like a beast!  I'm sure the teflon will slide back and forth real nice in there.  
 
Looking forward to seeing you and the IC mikado at the unmeet, Ray.
 
 
Dean


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Dean
SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #1043 on: Jan 3rd, 2012, 7:36pm »
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I just went out to get the mail, and  there was a box from Bill, with my new pistons.   They look great, I will post pics of the install.   The CN has  been keeping me pretty busy, I hope to work on the engine  wed or thur.   Thanks again Bill.  Ray III

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Dave_J
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #1044 on: Jan 3rd, 2012, 9:21pm »
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Are the rings commercial, or cut from raw stock?
 
Thanks
 
Dave J.


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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #1045 on: Jan 3rd, 2012, 10:01pm »
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Dave ,they are commercial.  These came from grainger.  They are solid , and reinforced with fiberglass.  You can buy them cut with a butt joint,  cut on a 45, and also a step joint.  I hope to install them tomorrow or thursday.  Ray III

« Last Edit: Jan 3rd, 2012, 10:01pm by SteamHeaton » Logged
Brian Tusin
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #1046 on: Jan 4th, 2012, 8:18pm »
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Ray,
 
What are the advantages of using the teflon rings?  I know there are a few people that use just viton o rings for piston and valve rings in 3/4 inch engines with no problems.  On 3/4 inch engines the boiler pressure and load is no where near what it would be on your Mikado.


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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #1047 on: Jan 5th, 2012, 1:59pm »
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Brian,  the benefits are to be determined.  I did some research on them after Bill offered to make a new set of pistons, using them.   There are some very well know builders across the country who use them, and have been using them for years.  These are able to withstand 500 degrees, also might handle a  lubricator  failure better.  Time will tell.  They seem very promising.    Ray III

« Last Edit: Jan 7th, 2012, 4:45am by SteamHeaton » Logged
SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
 
« Reply #1048 on: Jan 24th, 2012, 3:03pm »
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I finally was able to get out in the shop and work on the engine.  Installing the new pistons was at the top of the list , and the CN has kept me very busy as of late.  Last night and this morning I  had a few hours to get some work done.  I started on the engineers side.  I thought the guide bars were  nose down to the front , but they were not.  I removed the old shims and made some new ones.  I had .020 play and now I have .005    between the top and bottom guide bar.   With the new piston installed,  there is no binding through the full stroke .  I removed the wrist pin so I could move the piston and crosshead ,back and forth without rolling the engine.  I used the  aluminun ring compressing collar that Bill sent with the new pistons. They went in like a dream.  Since my  bronze liner is recessed in the cylinder casting about  .300.  I had to turn a step on the ring compressing collar.  The  only thing left to do on the engineers side is remove the piston , so I can loctite all of the screws in the new 3 piece pistons. Bill left this  task to me incase I needed to disassemble the piston. I will now post some pics to show you what I just described.  I hope to work on the firemans side this weekend.    Ray III

« Last Edit: Jan 24th, 2012, 4:28pm by SteamHeaton » Logged
SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #1049 on: Jan 24th, 2012, 4:31pm »
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new pistons waiting to be installed. Ray III

http://Forums.Railfan.net/Images/LiveSteam/IMG_6107_854x569.jpg
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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #1050 on: Jan 24th, 2012, 4:33pm »
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after honing , you can still see some very light marks in the liner . Ray III

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SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #1051 on: Jan 24th, 2012, 4:36pm »
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pic of the engine on the stand , with the shop light on the cylinders.  Ray III

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« Last Edit: Jan 24th, 2012, 4:37pm by SteamHeaton » Logged
SteamHeaton
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Re: BOILER BUILDING + Other Projects by STEAMHEATON
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« Reply #1052 on: Jan 24th, 2012, 4:38pm »
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piston removed. Ray III

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SteamHeaton
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« Reply #1053 on: Jan 24th, 2012, 4:39pm »
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wrist pin removed. Ray III

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SteamHeaton
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« Reply #1054 on: Jan 24th, 2012, 4:42pm »
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The aluminum ring compressing collar , after the step was cut into it.  This collar has a slight taper on the non step side then goes to a straight bore . It worked perfectly. Ray III

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SteamHeaton
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« Reply #1055 on: Jan 24th, 2012, 4:43pm »
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test fit of  collar on the cylinder. Ray III

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SteamHeaton
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« Reply #1056 on: Jan 24th, 2012, 4:44pm »
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the collar in position. Ray III

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SteamHeaton
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« Reply #1057 on: Jan 24th, 2012, 4:45pm »
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getting ready to compress the rings. Ray III

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SteamHeaton
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« Reply #1058 on: Jan 24th, 2012, 4:46pm »
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Rings compressed. Ray III

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SteamHeaton
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« Reply #1059 on: Jan 24th, 2012, 4:47pm »
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another pic of rings compressed. Ray III

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