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Oil Field Engines & Related Equipment

Fairbanks Morse ZC oil pumpjack


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  #21  
Old 12-13-2012, 10:28:50 PM
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Reed Engine Reed Engine is offline
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Default Re: Fairbanks Morse ZC oil pumpjack

You're not the first to think that. I sold a 118 to a customer one time and he didn't pay the bill. I called and ask what was wrong/etc. and he said "this engine isn't even put together right, there's some thing on the side that's not hooked up to anything. Just flops around". I said you've got to be kidding right? and explained what that "thing" was and it's purpose and informed him if payment didn't arrive soon I was going to repossess my engine. Bla bla bla, you get the idea. He paid up.
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  #22  
Old 12-14-2012, 04:31:02 PM
Gold Dredger Guy Gold Dredger Guy is offline
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Default Re: Fairbanks Morse ZC oil pumpjack

The regulator has a "Idle" screw, according to the booklet.
IT shows a spring, which I dont have , but ? is will it be used since these are fixed rpm. Where should it be screwed, closed or half or what.
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  #23  
Old 12-14-2012, 05:07:39 PM
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Reed Engine Reed Engine is offline
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Default Re: Fairbanks Morse ZC oil pumpjack

This screw is where? The gas regulator or on the fuel mixer/carburetor? If it's on the gas regulator you can set it by putting the gas hose straight down into a bucket of water and then adjusting the spring up or down till the hose quits bubbling at about 5-10". That would be 3-6 oz of pressure or so. Close enough for the oil field.

If this screw is on the back of the carb, screw it shut and pretend it doesn't exist. Far too much trouble to get the gasoline part of that carb to work. Save yourself some real misery.
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Old 12-14-2012, 11:28:05 PM
Gold Dredger Guy Gold Dredger Guy is offline
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Default Re: Fairbanks Morse ZC oil pumpjack

Its the slotted head screw that is on the left side of the pic above the 1/2" pipe that the gas hooks to, about the size of a nickel, the book calls it a idle screw?
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  #25  
Old 12-15-2012, 10:01:10 AM
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Default Re: Fairbanks Morse ZC oil pumpjack

OK, on an Impco simply ignore that. That only works on a multi cylider engine with consistent vacuum. A single cylinder pulses so much that screw does nothing. That carb is not the OEM FM (or Bell) carb.

Impco makes a generic carburetor that is grafted onto many different engines after the fact (same thing with magnetos). So you can find features on both that don't apply to your application.
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Last edited by Reed Engine; 12-15-2012 at 10:11:38 AM.
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  #26  
Old 12-17-2012, 07:15:16 PM
Gold Dredger Guy Gold Dredger Guy is offline
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Default Re: Fairbanks Morse ZC oil pumpjack

Quote:
Originally Posted by Reed Engine View Post
That's exactly how it is supposed to look (other than the rust etc).



It's purpose is to move the governor spring in and out on it's toothed lever. You hold the knurled end with your fingers and manipulate it to get the end of the rod (it's cupped) over the end of the spring. Then you can move the spring right (faster) or left (slower). You can do this while the engine is running, the little rod (whatever it's name is?) is to keep the flywheel from rubbing your hand.
Looking at the 2nd pic the spring looks to be tight, but there is about 3/8 to 1/2 inch that does not catch while its not running, My question for tonight is" Which way does the lever move as the engine speeds? Toward the rear or head end of engine. And should I get a slightly shorter spring to make it fit in the cradle?, Haven't really got it sped up yet due to a mount that has to be welded, so after that repair it might be clearer to me.
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Old 12-18-2012, 12:01:59 AM
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Default Re: Fairbanks Morse ZC oil pumpjack

You have the correct parts. They may be worn out, maybe not. I'd say the internal governor shaft is bent, I'd go inside the engine and correct it. You want an even amount to travel for the external lever either side of 90 degrees to the engine. When I say correct it I mean bend the shaft till things line up. The shaft I speak of is a goose neck with a ball on the top of it. They are famous for being/getting bent. Just bend it back.


A question to the other forum-ites here, is there any benefit to a discussion like this online or should we go to PM's? Just wondering if this is of no value to the larger percent of the OFE guys. I know some of you guys don't really look at "modern" engines as what this forum is about. You tell me.
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Last edited by Reed Engine; 12-18-2012 at 09:06:43 AM.
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  #28  
Old 12-20-2012, 03:20:07 PM
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Default Re: Fairbanks Morse ZC oil pumpjack

No no- keep it public! I'm learning here!!!
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Old 12-22-2012, 10:20:18 PM
Allan Wright Allan Wright is offline
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Default Re: Fairbanks Morse ZC oil pumpjack

I'm voting with dkamp on this one. I am one of those new engine guys.
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  #30  
Old 12-23-2012, 03:16:38 AM
Gold Dredger Guy Gold Dredger Guy is offline
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Default Re: Fairbanks Morse ZC oil pumpjack

So is a 1947 engine considered "NEW" ?,
Also allen Recieved the package today,Thanks again.
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