Disassembly And Assembly Of Subassemblies: Piston: Assembly

WARNING: This page is about a different car, the 2018 Ford F-350 Super Duty and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

If the piston and/or connecting rod are being installed new, the connecting 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.

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NOTE: Align the piston-to-connnecting rod orientation marks made during disassembly.

Install the piston to the connecting rod.

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Lubricate with clean engine oil and install the piston pin.
Material: Motorcraft ® SAE 5W-30 Synthetic Blend Motor Oil / XO-5W30-QSP (WSS-M2C946-A)

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Install the piston pin retainers.

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1. Lubricate with clean engine oil and install the lower oil control ring.
  Material: Motorcraft ® SAE 5W-30 Synthetic Blend Motor Oil / XO-5W30-QSP (WSS-M2C946-A)
2. Lubricate with clean engine oil and install the oil control expander ring with the expander tips up.
  Material: Motorcraft ® SAE 5W-30 Synthetic Blend Motor Oil / XO-5W30-QSP (WSS-M2C946-A)
3. Lubricate with clean engine oil and install the upper oil control ring.
  Material: Motorcraft ® SAE 5W-30 Synthetic Blend Motor Oil / XO-5W30-QSP (WSS-M2C946-A)
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Lubricate with clean engine oil and install the lower compression ring with the hook feature pointing down toward the bottom of piston.
Material: Motorcraft ® SAE 5W-30 Synthetic Blend Motor Oil / XO-5W30-QSP (WSS-M2C946-A)

Courtesy of FORD MOTOR COMPANY
Lubricate with clean engine oil and install the upper compression ring with the "O" mark on the ring pointing up toward the top of the piston.
Material: Motorcraft ® SAE 5W-30 Synthetic Blend Motor Oil / XO-5W30-QSP (WSS-M2C946-A)

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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. Lower compression ring gap location.
4. Upper oil control segment ring gap location.
5. Oil control expander ring gap location.
6. Lower oil control segment ring gap location.

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