If you are talking about the plug on each end of the cylinder head it is to drain the oil from the high pressure oil galleries in the head. So if that is leaking you can pick up a new plug and O ring kit from the dealer to replace it.
If that is the leaking plug, which is not uncommon use a 3/8" drive to get it out and new one in.....some long extensions help, can't remember if you have to pull an up-pipe or the DP to get at it though....
jrc
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97 XLT F250 CC ZF-5 (now ) DIY short shifter 355's D60 air locked T Wildman files, 'jectors, SD Hpop, DIY E-fans, IC, DP 4" exhaust, SS resonator, RSK, SD springs all corners, Velvet rides, Custom Aluminum Drybox/fuel tank, air bags, E-air compressor, VisionX HID/LED's, E fuel, F26D rear tank, E-fan Tranny oil cooler. http://community.webshots.com/user/jcart44
The plug I'm talking about is just above the starter, you can see it if you look in the passenger front wheel well, you can see it between the frame, just below the header.
You may be talking about the oil galley drain plug. They are pipe threads, just tighten up. If that doesnt do it, back the plug out and reinstall with pipe dope on the threads.
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Randy
Midnight black '94 * F-250 * 4x4 * ZF-5 * 3:55 * cc/lwb * RDS Single Shot Stage I's* TDP 6pos chip * BDP electric fuel * BDP D-66 Turbo * IDM Mod * Hypermax 3x4" dp * Authentic Tymar intake* 7.3 Intercooler * gutted ebpv * 4" exhaust & 5" tip * LUK clutch * A-pillar pod w/ Auto Meter NV boost, pyro and water temp gauges * reverse dash lighting and hvac controls * Optima yellow top batts D75/25, both on the right side * HPO X-over mod * manually controlled gp's * cruise control mod * add-a-leaf (front) * AC mod
You may be talking about the oil galley drain plug. They are pipe threads, just tighten up. If that doesnt do it, back the plug out and reinstall with pipe dope on the threads.
There is a coolant plug that is also located in the end of the head that is 1/2 and has a 3/8 pocket for a ratchet to take it out. It's at the drivers side rear, just below the bottom corner of the valve cover. There is also the same thing in the front corner, passenger side.
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Bumper to bumper, Full Synthetic!!! Rotella T 5-40(7.3L) -- Mobil 1 Mercon V(E40D) -- Amsoil Extreme 75-90(Danas 60) -- Detroit Lakes, Minnesota -- "Boating has always been a rich mans hobby". -- 1996 E350 XLT Club Wagon 15 Passenger Van. -- Purchased 10-21-2009 for $700 cash with 620,000 miles on it! -- It's mint and beautiful! -- I love it! -- I am 64 years old and a professional mechanic and truck driver for over 45 years. --I am now a rich man driving a $50,000 prime time Ford that gets 21 MPG(HWY) & 16 MPG(Town).
This just went out on my 7.3. If is the plug that holds the dipstick it could get ugly. There is a large 'o' ring on the inside of the pan; if it fails you will be pumping oil out through the seal. International Harvester sells a kit to repair this in without pulling the motor. I tried, dropped the piece and OUCH! the motor had to come out. Some other kind soul posted step by step color photos with the International part number and infor if your are interested let me know.
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) DIY short shifter 355's D60 air locked T Wildman files, 'jectors, SD Hpop, DIY E-fans, IC, DP 4" exhaust, SS resonator, RSK, SD springs all corners, Velvet rides, Custom Aluminum Drybox/fuel tank, air bags, E-air compressor, VisionX HID/LED's, E fuel, F26D rear tank, E-fan Tranny oil cooler. 
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