Lincoln Navigator: Engine - 3.5L EcoBoost (272kW/370PS) / Piston. Disassembly and Assembly of Subassemblies

DISASSEMBLY

1. Remove the piston rings and discard.
   

1. • Remove the piston pin retainers and discard.
     
   • Remove the piston pin.
     

1. NOTE: If the piston and connecting rod are to be reinstalled, they must be assembled in the same orientation. Mark the piston orientation to the connecting rod for reassembly.

   Remove the piston from the connecting rod.
   

1. Inspect the piston and connecting rod.
   Refer to: Piston Inspection (303-00 Engine System - General Information, General Procedures).
   

ASSEMBLY

1. If the piston and/or connecting rod are being installed new, the piston rod orientation marks and the arrow on the top of the dome of the piston should be facing toward the front of the engine block.
   

1. Install the piston to the connecting rod.
   

1. Lubricate with clean engine oil and install the piston pin.
   Refer to: Specifications (303-01C) .
   

1. NOTE: The piston pin retaining clip gap orientation must be toward the top or dome of piston.

   Install the piston pin retainers.
   

1. Inspect the lower compression ring to identify the orientation. The top of the lower compression ring will be angled at the top and notched on the bottom.
   
   1. Top Side.
      

1. Lubricate with clean engine oil and install the piston rings.
   Refer to: Specifications (303-01C) .
   

1. NOTE: The piston compression upper ring should be installed with the "O" mark on the ring face pointing up toward the top of the piston.

   NOTE: The arrow on the top of the piston indicates the front of the engine.

   1. Center line of the piston parallel to the wrist pin bore.
      
   2. Upper compression ring gap location.
      
   3. Upper oil control segment ring gap location.
      
   4. Lower oil control segment ring gap location.
      
   5. Lower compression ring gap location.
      
   6. Spacer oil control ring gap location.