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.
2008 Ford Edge AWD V6-3.5LFACTORY OEM SERVICE PROCEDURE
Piston, Engine
Piston
Diameter - single grade 92.476-92.490 mm (3.6407-3.6413 in)
Clearance-to-cylinder bore 0.010 to 0.044 mm (0.0003-0.0017 in)
Ring end gap
Compression
(top, gauge diameter) 0.15-0.25 mm (0.0059-0.0098 in)
(bottom, gauge diameter) 0.30-0.55 mm (0.0118-0.0216 in)
Oil ring (steel rail, gauge diameter) 0.15-0.45 mm (0.0059-0.0177 in)
Ring groove width
Compression
(top) 1.230-1.25 mm (0.0484-0.0492 in)
(bottom) 1.530-1.55 mm (0.0602-0.0610 in)
Oil ring 2.53-2.55 mm (0.0996-0.1003 in)
Ring width
Upper comp ring 1.17-1.19 mm (0.0460-0.0468 in)
Lower comp ring 1.47-1.49 mm (0.0578-0.0586 in)
Ring-to-groove clearance (upper and lower compression rings) 0.040-0.080 mm (0.0015-0.0031 in)
Piston pin
Bore diameter 23.002-23.006 mm (0.9055-0.9057 in)
Pin diameter 22.998-23.000 mm (0.9054-0.9055 in)
Pin length 55.975 mm (2.203 in)
Pin-to-piston fit 0.002 to 0.008 mm (0.00007-0.0003 in)
Clearance-to-connecting rod 2.7 mm (0.1 in)
Diameter - single grade 92.476-92.490 mm (3.6407-3.6413 in)
Clearance-to-cylinder bore 0.010 to 0.044 mm (0.0003-0.0017 in)
Ring end gap
Compression
(top, gauge diameter) 0.15-0.25 mm (0.0059-0.0098 in)
(bottom, gauge diameter) 0.30-0.55 mm (0.0118-0.0216 in)
Oil ring (steel rail, gauge diameter) 0.15-0.45 mm (0.0059-0.0177 in)
Ring groove width
Compression
(top) 1.230-1.25 mm (0.0484-0.0492 in)
(bottom) 1.530-1.55 mm (0.0602-0.0610 in)
Oil ring 2.53-2.55 mm (0.0996-0.1003 in)
Ring width
Upper comp ring 1.17-1.19 mm (0.0460-0.0468 in)
Lower comp ring 1.47-1.49 mm (0.0578-0.0586 in)
Ring-to-groove clearance (upper and lower compression rings) 0.040-0.080 mm (0.0015-0.0031 in)
Piston pin
Bore diameter 23.002-23.006 mm (0.9055-0.9057 in)
Pin diameter 22.998-23.000 mm (0.9054-0.9055 in)
Pin length 55.975 mm (2.203 in)
Pin-to-piston fit 0.002 to 0.008 mm (0.00007-0.0003 in)
Clearance-to-connecting rod 2.7 mm (0.1 in)
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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