SECTION 303-01B: Engine — 5.0L (4V)
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
7 6140 Piston pin retainer
8 6135 Piston pin
9 6200 Connecting rod
10 6110 Piston

Disassembly

 WARNING: Since the retainer ring has a tendency to spring out, cover the end of the pin bore with a hand or shop rag when removing the ring. Wear eye protection. Failure to follow these instructions may result in serious personal injury.

  1. Remove the piston rings from the piston.
  1. Mark the piston and the connecting rod on the same side for assembly reference.
  1. Remove the piston pin retainers and the piston pin.
  1. 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. NOTE: The connecting rod must be installed into the piston with the marks made during disassembly on the same side. If a new piston or connecting rod is being installed, it can be installed in either direction.

    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 piston pin retaining clips in the piston.
  1. Lubricate the piston and the new piston rings with clean engine oil.
  1. Install the piston rings onto the piston.