I was changing the glow plugs in an engine and I thought that with a bit of modification I could make a soldering iron out of one of the old glow plugs.

I just needed to add a handle and a battery cable and I would have a soldering iron, without having to buy one.

Step 1: Materials

Materials

Glow plug
wood off cuts(x2)
perforated metal strip
M4 bolts(x3)
M4 nuts(x3)
cable
small screw
electrical tape
crimp on ring terminal
crimp on female bullet connector

Tools

pliers
screwdriver
drill and 4 mm drill bit
sand paper/file
wire cutters

Step 2: Glow Plug

Cut a length of perforated strip about 4 inch long. Then bend it around the threaded section of the glow plug and secure it with an M4 bolt and nut. This bolt will also provide a point to attach the negative cable to the glow plug.

Step 3: Handle

I used two wood off cuts about 6" long by 1/2" thick to make the handle.

Use the perforated strip as a template to drill two holes through the wooden pieces. Then use the other two bolts and nuts to bolt them together with the perforated strip in the middle. Secure the other ends of the wood together with a small screw.

Use sandpaper or a file to smooth the edges of the handle to make it more comfortable to hold.

Step 4: Cable

Cut a length of cable and strip the ends of the wires. Then crimp a ring terminal onto the end of the black wire and a female bullet connector on the end of the red wire.

Then attach the ring terminal to the bolt holding the glow plug in and push the bullet connector onto the terminal on the end of the glow plug.

Step 5: Tip

Cut a piece of copper pipe about an inch long (I used 1/4" brake pipe) and flatten one end. Then use a file to shape it to a point. Then push it onto the end of the glow plug (you may have to squash it slightly to get it to stay on).

Step 6: Finished

Now connect the other ends of the wires to a car battery and the tip should heat up, ready for soldering.

The problem that I have found with my soldering iron is that it tends to over heat and burn out the glow plug, so I think that I will either add a switch so that I can switch it on and off, or reduce the amount of current going through it.