Does any body know if you need any specal tools to remove the cam on a 12 valve?
In the manual for a 04, they use wooden dowels to hold the tappits up when you take the cam out .

 

If all you are doing is removing the camshaft, you only need the wood dowels to hold the tappets up out of the way. Just insert them, then lift them up to pull the tappets to the tops of their guides, then rubber band each cylinder's pair of dowels together to hold the tappets in a bind.

As an alternative, you can pull the lifter gallery cover on the side, and lift each tappet with a magnet and then stick a small fridge magnet to the side of each one to hold them up.

There is only one bearing for the cam, and it is up front. The block is precision machined, so be real careful and keep everything straight and stable to pull the camshaft. It is real easy to clip a cam bearing surface on the block, and if that happens you are screwed, as it will be a trip to the machine shop and then working with Cummins to locate a set of repair bearings which are an absolute ***** to press into place.

Should you need to pull the tappets, you will need a length of copper plumbing slightly smaller than the camshaft bearings and the same length as the cam plus a few inches to act as a handle. Then cut the top half off so it is a half tube. That then slides into the cam location, you release the tappets, and they fall right out into the trough. To get them back in you use a magnet through the pushrod holes, and retrieve them from the trough and reverse the process by lifting each back into its guide, then locking it in place with a dowel or magnet.

If the engine is out of the truck and on a stand, just flip it upside down and the tappets will drop up and stay out of the way while you pull the cam.

 

Thanks!! that is just what I wanted to know.