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Fairbanks Morse 3HP Z Restoration


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  #1  
Old 05-05-2007, 01:36:29 PM
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Default Fairbanks Morse 3HP Z Restoration

Could someone who owns one of these please post up a photo of the backside of the carb / fuel pump / mixer so that I can see the mounting directions of the throttle linkage and the fuel pump bypass lever?

My engine is the Sumter Plugoscillator version.

Getting older and C.R.S. syndrome has set in when things have been taken apart too long!

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Old 05-05-2007, 02:23:51 PM
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Default Re: Fairbanks Morse 3HP Z (photo needed)

Harry see if these help, If not I can pull the engine out and get better ones.
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Old 05-05-2007, 02:28:19 PM
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Default Re: Fairbanks Morse 3HP Z (photo needed)

John,

Those are excellent! I was trying to figure out how the fuel pump bypass lever worked.

Are those photos of a 6HP? I see that it has the water intake jet.

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Old 05-05-2007, 02:35:45 PM
Robert Haus Robert Haus is offline
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Default Re: Fairbanks Morse 3HP Z (photo needed)

Is this the view you needed? ...if not, let me know and I will post some others...I can also pull the mixer off if you need to see the orientation of the butterfly itself.

rh
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Old 05-05-2007, 04:05:00 PM
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Default Re: Fairbanks Morse 3HP Z (photo needed)

Quote:
Originally Posted by Harry View Post
John,
Those are excellent! I was trying to figure out how the fuel pump bypass lever worked. Are those photos of a 6HP? I see that it has the water intake jet.
Harry, the picture is of a 3 hp, I have another 3 hp that has plugs for the water but no lines running to the head. (see pic). I learned a long time ago, you can't outguess the mfg. companys. I also have a 6 hp with mixer under the head and no water lines???Notice the lever on the carb will lock out the fuel pump from the tank, so you can fill the carb with gas and warm the engine up and then release the pump and pump kerosene from the tank.
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Old 05-05-2007, 09:56:58 PM
Robert Haus Robert Haus is offline
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Default Re: Fairbanks Morse 3HP Z (photo needed)

The ones without the water spray lines are for gasoline only...the water injection is to prevent detonation when operating under load on kerosene or other low-grade fuel.

You are correct about the lock-out lever being there to start and warm up on gasoline, then the pump is engaged and kerosene is delivered to the mixer.....then you adjust the water valve to suit the operating conditions....it is best to lock out the pump and run some gasoline at shutdown (or shut off the fuel entirely and let it stall) so that the heavy, oily kerosene isn't left in the combustion chamber (else it'll be hard to start the next time)

I still suspect this is one of the first widespread uses of ADI (anti-detonant-injection) in a production engine.

...Later, ADI was common practice on large aircraft engines of WW2 when running high supercharger boost pressures...the big radials usually used a mix of water and alcohol fed from a tank.......Reno air racers still do it this way.

rh
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Old 05-05-2007, 10:00:04 PM
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Default Re: Fairbanks Morse 3HP Z (photo needed)

I've got the carb all put back together, thanks. It's only been apart for eleven years, soaking in kerosene!

The fuel pump plunger was stuck tight and even electrolysis wouldn't loosen it, but I did get the needle screw out intact. I had to drill the brass plunger out and I was absolutely lucky - hit it dead center, clamped on the drill press and as the bit got down in there, the old plunger end started spinning on the drill bit. Hit and Miss Ed had a replacement plunger as well as the spring and the check balls.

I've been working on one horse and horse and a half engines too much. That makes a 3HP a handful to work on! I've got the block and the base all pressure washed and once they are mounted on the cart that I haven't built yet, all the parts and pieces can go back together.

The head on mine only has the places cast in for drilling and tapping the water passages.

A slow, but sure restoration! Here's my "before" photo. Can you imagine exactly what they were trying to accomplish with those magneto magnets? A spark plug adapter was in the igniter hole and the cam gear has a buzz coil timer pin installed. As for the kludge of metal work around the side, who can know.
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Old 05-06-2007, 05:47:10 PM
Robert Haus Robert Haus is offline
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Default Re: Fairbanks Morse 3HP Z (photo needed)

geeez!!! what a confused mess that was, makes ya wonder what they were trying to do.....but it definitely looks like you are on the right path.

rh
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Old 05-13-2007, 10:55:59 PM
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Default Re: Fairbanks Morse 3HP Z (photo needed)

It was definitely a confused mess! This was only my third engine and I found it because I stopped and talked with a farmer 1/2 mile from my home. He said, "follow me" and I did. It was in a weed patch out behind the barn and it hadn't been outside for long.

Work continues and it's cleaning up good. The bore looks really great as seen below and the cart is built so as to put this thing to work without fear of it tipping over.

It looks small, but the rails are 40" long and the cross arms are 24" wide. Three horsepower is a handful. The new fuel tank is installed and the finer details are coming together.
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Old 05-14-2007, 11:01:40 AM
Robert Haus Robert Haus is offline
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Default Re: Fairbanks Morse 3HP Z Restoration

What year is your engine?

...given the plugoscillator I would guess late 1917, 1918, or 1919.

What got me curious is that the fuel lines on yours run as two separate lines in through the top of the base and tank; whereas my 1916 model joins them together and runs them through at the bottom. I have seen it done both ways but I was trying to figure out when the production change took place.

rh
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