390 Cam Bearing Installation Tool

Here are some pics of the bearing driver I made to install cam bearings in my 390.  The shaft is made of 5/8 inch drill rod 36 inches long.  I welded a flat washer near one end of the drill rod and then threaded the last 1/2" of the rod.  The driver fits against the washer and is held in place with a second flat washer and a nut.  The driver is machined out of aluminum and is a snug fit inside the cam bearing.  I beveled the leading edge of the driver slightly to make it easy to slip the bearing over the driver.  There is a 1/8" flange at the rear of the driver that is just slightly smaller than the outside diameter of the bearing.  This allows you to drove the old bearings out and install the new bearings with the same tool.  If you are not planning on driving the old bearings out with this tool it would probably be better to machine the flange larger so that it would act as a stop to prevent the bearing from being driven in too far.  The guide is another piece of aluminum that is tapered so that it will center itself in the outermost bearing to insure that the bearings are being put in straight. 

The assembled driver

A close-up of the guide and driver installed on the shaft

This is the guide

This is the driver assembly