I pulled the head and cylinder off today and rechecked all the gaskets. All seems fine. I checked the piston and wrist-pin and the bearing that sits in the there and it seems okay, as well.
The noise is driving me nuts. It is like someone is tapping the cylinder with a ball peen hammer.
Is there any info online about cracking the A35 and replacing the crank bearing Terry? I'd love to give it a whirl but would like to know if I need any special tools or techniques to get inside the motor.