SECTION 303-01A: Engine — 3.7L
2014 Mustang Workshop Manual
DISASSEMBLY AND ASSEMBLY OF SUBASSEMBLIES
Procedure revision date: 01/07/2013

Piston


Material
Item Specification
Motorcraft® SAE 5W-20 Premium Synthetic Blend Motor Oil (US); Motorcraft® SAE 5W-20 Super Premium Motor Oil (Canada)
XO-5W20-QSP (US); CXO-5W20-LSP12 (Canada) 		WSS-M2C945-A


Item Part Number Description
1 — Piston compression upper ring (part of 6148)
2 — Piston compression lower ring (part of 6148)
3 — Piston oil control upper segment ring (part of 6148)
4 — Piston oil control spacer (part of 6148)
5 — Piston oil control lower segment ring (part of 6148)
6 6140 Piston pin retainer clip
7 6140 Piston pin retainer clip
8 6135 Piston pin
9 6200 Connecting rod
10 6110 Piston

Disassembly

  1. Remove the piston rings from the piston.
  1. Remove the 2 piston pin retainers and the piston pin.

  1. NOTE: 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.

    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.

    Separate the piston from the connecting rod.
  1. Clean and inspect the piston and connecting rod. For additional information, refer to Section 303-00 .

Assembly

  1. Align the piston-to-connecting rod orientation marks and position the connecting rod in the piston.
  1. Lubricate the piston pin and pin bore with clean engine oil.
  1. Install the piston pin in the piston and connecting rod assembly.
  1. Install the new piston pin retaining clips in the piston.
  1. Lubricate the piston and the new piston rings with clean engine oil.

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

    Install the piston rings onto the piston as shown.
    1. Center line of the piston parallel to the wrist pin bore
    1. Upper compression ring gap location
    1. Upper oil control segment ring gap location
    1. Lower oil control segment ring gap location
    1. Expander ring and lower compression ring gap location