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 Explorer 2WD V8-4.6LFACTORY OEM SERVICE PROCEDURE
Piston, Engine
Piston
Diameter (at right angle to pin bore) (uncoated)
Grade 1 90.182-90.167 mm (3.5504-3.5499 in)
Grade 2 90.196-90.179 mm (3.551-3.5503 in)
Grade 3 90.208-90.193 mm (3.5515-3.551 in)
Clearance-to-cylinder bore (at grade size) 0.017-0.047 mm (0.0007-0.0019 in)
Ring end gap
Top 0.15-0.30 mm (0.006-0.012 in)
Intermediate 0.25-0.50 mm (0.0098-0.0197 in)
Oil control 0.15-0.65 mm (0.0059-0.0256 in)
Ring groove width
Top 1.52-1.54 mm (0.0598-0.0606 in)
Intermediate 1.52-1.54 mm (0.0598-0.0606 in)
Oil control 3.030-3.056 mm (0.1193-0.1203 in)
Ring width
Top and intermediate 1.50-1.48 mm (0.0590-0.0582 in)
Ring-to-groove clearance
Top 0.020-0.060 mm (0.0008-0.0020 in)
Intermediate 0.020-0.060 mm (0.0008-0.0020 in)
Pin bore diameter 22.0125-22.0175 mm (0.8666-0.8668 in)
Pin
Diameter 22.0010-22.0030 mm (0.8662-0.8663 in)
Length 61.8 mm (2.433 in)
Fit-to-piston 0.0095-0.023 mm (0.0004-0.0009 in)
Diameter (at right angle to pin bore) (uncoated)
Grade 1 90.182-90.167 mm (3.5504-3.5499 in)
Grade 2 90.196-90.179 mm (3.551-3.5503 in)
Grade 3 90.208-90.193 mm (3.5515-3.551 in)
Clearance-to-cylinder bore (at grade size) 0.017-0.047 mm (0.0007-0.0019 in)
Ring end gap
Top 0.15-0.30 mm (0.006-0.012 in)
Intermediate 0.25-0.50 mm (0.0098-0.0197 in)
Oil control 0.15-0.65 mm (0.0059-0.0256 in)
Ring groove width
Top 1.52-1.54 mm (0.0598-0.0606 in)
Intermediate 1.52-1.54 mm (0.0598-0.0606 in)
Oil control 3.030-3.056 mm (0.1193-0.1203 in)
Ring width
Top and intermediate 1.50-1.48 mm (0.0590-0.0582 in)
Ring-to-groove clearance
Top 0.020-0.060 mm (0.0008-0.0020 in)
Intermediate 0.020-0.060 mm (0.0008-0.0020 in)
Pin bore diameter 22.0125-22.0175 mm (0.8666-0.8668 in)
Pin
Diameter 22.0010-22.0030 mm (0.8662-0.8663 in)
Length 61.8 mm (2.433 in)
Fit-to-piston 0.0095-0.023 mm (0.0004-0.0009 in)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.