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Working on the propane conversion of my gas stove. One of the orifices to be changed is in a very hard to access location - shown in the photo. The orifice is the "nut" I'm referring to, which you can fit a wrench onto.

Although it is possible to get a wrench on it there is a very limited range of motion due to surrounding apparatus. I've tried to mark this in the photo with the red lines. The very short arc that the wrench can turn in means that it never gets a 'bite' on the orifice / nut and I can't even loosen it.

It would be much more work to disassemble the other parts in this area, so I'm hoping for a solution to remove and then reinstall just the orifice part. Maybe there's a specialty type of wrench... or something else I'm not thinking of.

Thanks

What you may be overlooking, or what may not be present on your wrench, is the the open wrench is not square to the shaft. It is canted by 1/24 of a circle (15 degrees).

That means you only need a 30 degree arc of motion, not a 60 degree arc. When you run out of travel, remove the wrench, flip it over, raise it 1/12 of a circle (30 degrees), and it will fit on the next flat.

If your range of motion is being compromised by the wrench being all loosy-goosey on the nut (that's a technical term), then you have the wrong size wrench. In particular, watch out for English vs. Metric. The only wrench sizes that match up are 3/4=19mm, all others will be sloppy.

An adjustable wrench (commonly called a 'monkey wrench', inaccurately) is one answer, but you have to get that tight and might have to retighten on every turn.

It certainly looks like you have more than 30 degrees of motion there (though perhaps not quite 60 degrees). If you are tighter than 30 degrees, first stop and think about how the manufacturer intended this thing to be serviced, because not least, they had to build it and they certainly didn't want their factory workers spending 10 minutes fastening this one thing. If the range of motion is simply impossible, then you need the extreme options offered by others, or perhaps a "stubby" (short length) wrench that allows you to work inside the obstructions...

A Crowfoot Wrench would work nicely. A 10 piece set of these is only $15.00

An open end Ratchet wrench is likely the best tool for this job.

Something like this:

The best tool I have found for the type of application you are working with is a 12-point split-box wrench. These are also available in a 6-point design.

^{(Picture Source: http://constructionmanuals.tpub.com/14256/css/Types-and-Uses-Continued-156.htm)}

The split end lets the wrench get onto a fitting even when a tubing is inline. The box construction also gets better grip on the fitting than trying to use a conventional open ended flat sided wrench. The 12-point design and ability to flip the wrench over if needed from stroke to stroke makes this the tool of choice if the working angle to the fitting is small.

One solution I have is a set of wrenches with angled heads - you can see one end has a greater angle than the other, very handy in many situations :

Mind you, the set cost me quite a bit... But that was a long time ago.

Crows foot attached to a universal join on the end of a long socket drive extension and a socket rachet wrench.

EDIT this won't work because in this instance the fastener is obstructed by a pipe. Leaving for completeness.

There appears to be plenty of width to the slot. How about a socket with a long extension bar and a universal joint?

They add slop but that's no more than annoying. You'd require a deep socket to go over any bolt too.