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Antique Gas Engine Discussion

6 Horsepower Flinchbaugh York Engine


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  #41  
Old 02-17-2019, 04:54:10 PM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 hp York

Time to make some patterns of parts I need to have cast. Fortunately a friendly collector with another 6 hp York gave me all the dimensions for the piston and con-rod. The piston is extremely long 11.125". A friend glued together a block of wood sheets. Over the weekend I machined a wooden piston out of it. It is about 5/16" oversize to compensate for shrinkage and I rather machine off a lot than have not enough material.
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  #42  
Old 02-17-2019, 05:23:56 PM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 hp York

I also made a pattern for the big-end bearing block. I will have it cast in one piece.
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  #43  
Old 02-17-2019, 06:09:10 PM
Dale Russell Dale Russell is online now
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Default Re: 6 hp York

Harry, where there is a will, there is a way! Have fun. You must feel a huge amount of accomplishment when you hear a case like this run for the first time.
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  #44  
Old 02-22-2019, 06:13:40 PM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 hp York

I need some thoughts on this:
I need to make a new 3" 8tpi plug in the front of the combustion chamber as I sawed the old one out. Should it be made from cast iron so it is the same material as the cylinder / combustion chamber, or would steel work as well. I was thinking since a steel spark plug seals well in either a steel cylinder head, and even an aluminum head, so I think a steel plug will work fine.
Any idea's?
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  #45  
Old 02-22-2019, 08:24:18 PM
Bill Hazzard Bill Hazzard is offline
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Default Re: 6 hp York

Steel would work fine but cast iron was original so I would make a cast plug.
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  #46  
Old 02-23-2019, 03:44:19 AM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 hp York

You are right about that Bill, although it will be invisible (it's behind the cover plate) I agree cast iron is original. It will probably also rust less than steel.
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  #47  
Old 02-25-2019, 09:39:32 PM
ohiomotorco ohiomotorco is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

Is the plug a tapered pipe plug? I have access to cast iron tapered pipe plugs made in a couple configurations, and would be happy to obtain one for you.
3" NPT plugs are 8 TPI
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  #48  
Old 02-26-2019, 12:44:00 AM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

Yes it is a tapered pipe plug. I got a 3" BSP plug here but it turned out to have the wrong pitch (11') I didn't check before I got it. It also was hollow on the back side. The original was flat on the cylinder side. If you could check out for me if they are flat on the back side. If so I would appreciate your offer to get one.
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  #49  
Old 03-13-2019, 11:24:47 PM
ohiomotorco ohiomotorco is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

Harry,

I sent you a PM tonight, hopefully the photo of the plug is attached. It is completely flat on the bottom , with a 1-1/2" recessed square on the face for install.

Karl
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  #50  
Old 03-16-2019, 12:25:06 PM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

The surface of the exhaust valve box on the cylinder casting was rotted pretty bad. My first idea was to just clean it out thoroughly and fill the holes with JB weld, however I wasn't happy with the JB weld and at second thought I decided it wasn't the right way to do. So I took the cylinder back to my work and made a set up to attach it to the mill.
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  #51  
Old 03-16-2019, 12:37:39 PM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

After lining everything out it took only a few passes to get a clean and flat surface. Of course the valve box was also cleaned up. New 5/8" 12 TPI studs are made.
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  #52  
Old 03-17-2019, 08:05:49 AM
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P Schmidt P Schmidt is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

Harry, Good job !!! That is doing it the correct way. JB weld would have failed.

Paul
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  #53  
Old 03-17-2019, 08:32:38 AM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

Thanks Paul,
I agree, the JB weld solution was wrong from the beginning but it didn't hurt as it just mills away again. I saw I posted the wrong photo of the result. This is the correct photo. On the photo it looks like there are quite some marks, but with the eye it's barely noticeable.
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  #54  
Old 03-18-2019, 04:46:49 PM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

Making 8 new 5/8" x 3 1/4" high-crown bolts. I'm going through a full length 1-1/16" hexagon bar just for the 8 bolts and a few nuts.
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  #55  
Old 06-13-2019, 04:53:21 PM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

I am very happy that the previous owner in Australia found the original rod, and one half bearing shell and also the original piston. Even better, they were able to bring it to the Nuenen show where I got it.
I wonder what the letters R B mean. My guess is that the rod was made by a specialized supplier.
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Old 06-13-2019, 08:13:47 PM
Jeremy Hartle Jeremy Hartle is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

You lucky dog. Better go buy a lottery ticket.
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Old 06-15-2019, 03:34:41 PM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

The last big parts that needed a electrolysis treatment were the flywheels with the crankshaft. Clearly visible after a thorough clean-up are the marks of machining the outside of the flywheel. As seen in the last picture the inside of the flywheel is not machined. I don't know if it was common practice to machine the outside of the flywheels for some engine factories.
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  #58  
Old 06-30-2019, 03:26:11 AM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

The cam was worn quite bad so I decided to replace it. I machined the worn cam-lobe from the gear, and had a a new cam plasma cut and told them to keep the hole smaller so I was able to machine it out to make a shrink fit. Of course they did cut the hole as well, and it wasn't exactly a tight fit. So I welded up the hole and after some time consuming setting up in the 4 jaw chuck I machined is out to just under size.
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  #59  
Old 06-30-2019, 03:40:40 AM
Harry Terpstra Harry Terpstra is offline
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Default Re: 6 Horsepower Flinchbaugh York Engine

I put the gear in the freezer for a couple of days. Then I heated the cam and slid it on the gear. Although it is very stuck on just the shrink fit, I decided to put in some set screws just to be sure.
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