Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Disassembly And Assembly Of Subassemblies: Piston: Assembly
2021 Ford Edge SE, 4WDSECTION Assembly
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- For assembly purposes the bump on the connecting rod will face the same way as the bump on the connecting rod cap.
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- For assembly purposes the bowl on the dome of the piston should be facing toward the intake of the engine.
- On the RH bank the bump on the connecting rod and cap should face the front of the engine.
- On the LH bank the bump on the connecting rod and cap should face the rear of the engine.
- Position the piston on the connecting rod.
- Lubricate the piston pin with clean engine oil and install the pin.
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NOTE: The piston pin retainer gap orientation must be toward the top of the piston.
Install the piston pin retainers.
- Lubricate the oil control rings with clean engine oil and install the rings.
- Upper oil control ring.
- Oil control expander ring.
- Lower oil control ring.
- Lubricate the lower compression ring with clean engine oil and install the ring.
- The lettering on the ring should point up toward the top of the piston.
- The hook feature will point down toward the bottom of piston.
- Lubricate the upper compression ring with clean engine oil and install the ring.
- The lettering on the ring should point up toward the top of the piston.
- Position the piston ring gaps.
- Center line of the piston parallel to the wrist pin bore.
- Oil control expander ring gap.
- Upper compression ring gap.
- Lower oil control ring gap.
- Lower compression ring gap.
- Upper oil control ring gap.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.