Ok, My truck has sat for quite a while, I got it started up, seemed to be running well, so I drove it up and down the street, when I got back water was squirting from the freeze plug on the passenger side of the block, underneath the exhaust manifold. Is it possible to replace without removing the motor. Other than that it seemed to be running good. The truck has sat for about 5 years, but I changed the oil, battery, plugs, points, and it started really easy. The engine did not smoke, and was running strong, so anyway, any help would be greatly appreciated. Oh, yeah it is a 66 F-100, with a 352, and automatic transmission.

 

Mobley: Yeah, I had that problem once as well. Sounds like the plug rusted out from the inside, and that's really rather common. It is possible to replace it, and you've got two options, without pulling the engine.
1. Replace it with a steel or brass plug. This will work ONLY - and I do mean ONLY - if you can get a straight and clear shot to drive the plug into the block. Metal plugs are a press fit, and must be driven in with force, hence the need for room and clearance to swing a hammer onto the plug. Generally, I have only had good luck installing this type with the engine out. If you want to try it, you will need to find a large socket or something similar. It must fit just inside the plug ring so that you can get even force all the way around the plug.
2. Install a rubber plug. This is easy. Just get the right size, remove the old plug (see below), insert this one, and tighten the nut. This one works by compressing a rubber plug in the hole, which effectively seals it. It will not restrict water flow or inhibit cooling.
3. Removing the old plug. you may need to remove an engine mount, and or jack up the engine a bit. If you have to, let us know, and we can warn you of the things you need to take off and watch for to prevent other damage. Usually a long screwdriver and a hammer are necessary to pry it out, and sometimes you end up chewing the thing up to get it out. Drive the screwdriver into the plug at an angle near the edge, and try to pry it out first. Once it breaks though the plug, don't hammer too hard, though, you may damage a cylinder wall if you hit it hard enough! Try to keep it from falling into the block. If it does anyway, don't worry about it. You will need, however, to push it to the side out of the way of the new plug, especially if you choose to use a rubber one.
I left an old rusted one in my engine for many years with no trouble. I'm sure others can let you know if they had trouble with it.
Good luck!

 

Yes you can replace it with the rubber type just keep a spare with you cause if ones bad the otheres are not far behind.
When / if you pull the motor to do all of them get the brass ones they last longer. Not sure on FE fords but on my old Internatinal there was several plugs in the bellhousing area. I had to pull the motor to replace on once total PIA. (pain in the ***)

To pop out the old plug try to hit it near the rusted hole to make it biger then slip a pry bar in and get it to twist slideways and grab it with plyers.

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