Ford F53 Owner's Manual page 107

5. Install a new air filter element.
6. Replace the air filter cover to the
housing and secure the latches. Be
careful not to crimp the filter element
edges between the air filter housing.
This could cause filter damage and
allow unmetered air to enter the engine
if not properly seated.
Motorhome (TY3) Canada/United States of America, enUSA, Edition date: 201712, Second Printing
Maintenance
104