Some people remove the valve covers, then listen next to each one with a stethoscope. When you have rocker arms run by push rods, you can rest your finger on the center of the rocker arm and feel a clicking if the lifter isn't pumped up.
Also look for the obvious signs of lack of oiling. You don't want to see blue cam lobes or scratches in them. A few years back Ford had a lot of trouble on the 4.0L engines that used push rods with them developing real bad wear where the push rod contacted the rocker arm. Those made a clicking sound that sounded very much like a collapsed lifter. That was caused by poor oiling and a failure of the push rod to rotate while in operation.
Wednesday, July 1st, 2015 AT 12:04 AM