MC91B1 rod, piston, wrist pin assembly

[Terry Bentley]

You can heat up the piston and just push the closed end bearing in with a press. Or using the pin removal tool with a flat piece against the bearing cup. Put the rod in place so you have a stopping point. Or better to have a steel blank that fits snug instead.

I machined a dummy wrist pin that was slightly undersize to fit thru rod. Used it to help guide the bearing cup in place square. There are other simple ways just using what you have available too. Just dont force anything.