Ford Ranger Maintaince And Repair Manual page 454

HOW TO USE THIS BOOK
Before cleaning and inspection, use a ring expander tool to remove the piston rings
Remove any oil galley plugs, freeze plugs and/or pressed−in bearings and carefully wash and degrease all of
the engine components including the fasteners and bolts. Small parts such as the valves, springs, etc., should
be placed in a metal basket and allowed to soak. Use pipe cleaner type brushes, and clean all passageways in
the components.
Use a ring expander and remove the rings from the pistons. Clean the piston ring grooves with a special tool
or a piece of broken ring. Scrape the carbon off of the top of the piston. You should never use a wire brush on
the pistons. After preparing all of the piston assemblies in this manner, wash and degrease them again.
Clean the piston ring grooves using a ring groove cleaner tool, or ...
448 CLEANING