Help identify this tool please

I was wondering if someone could please help me identify this tool. I found it in the attic a few years back, it belonged to my dad. I can not remember what it is called nor what is was for. I believe at one time my grandfather said it had something to do with engines.

Here is a picture of what it looks like:
http://i1164.photobucket.com/albums/q569/BrianCharlie/Picture021-1.jpg


Thanks in advance

My guess it is a slide hammer- as in what is used to pull rear axles

It's a good cam bearing driver.