Fitting pistons into the block:

1. Use a piston compressor to carefully compress the rings into their grooves:



Make sure that some piston projects under the compressor tool - you need this to ensure the piston will be able to be squarely pushed into the bore.



2. Ensure everything is sitting squarely:



3. Use a blunt soft object - for example the shaft of a hammer - to sharply whack the piston into it's bore:



Fast, hard, but short - you dont want to project the piston and rod straight through the block to be damaged on the workshop floor.

4. Job done. Drink a cup of tea and admire your pistons, it will be the last time you'll see them (hopefully).