Tip: The oil pan has a removable "windage tray" or often called dipper tray which allows the connecting rod lower ends to get oil from the grooves in the tray.
To remove the tray, after you drain as much oil from the pan as possible, take the tray and holding it upside down,drop it onto a level lawn and the impact will knock the tray out of the pan. Do not attempt to pry it out as it can be easily bent. Now you can clean all the gunk from the bottom of the pan. I found an engine that had 2 inches of mud like sludge but still ran somehow.
Good luck, Mike
