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.
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HOMESERVICE MANUALSMERCURY2006GRAND MARQUIS V8-4.6L VIN WREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON, ENGINE
2006 Mercury Grand Marquis V8-4.6L VIN W
Piston, Engine
2006 Mercury Grand Marquis V8-4.6L VIN WSECTION Piston, Engine
Piston
Diameter
Grade 1 90.191-90.206 mm (3.5508-3.5514 inch)
Grade 2 90.203-90.220 mm (3.5513-3.5519 inch)
Grade 3 90.217-90.232 mm (3.5518-3.5524 inch)
Piston-to-cylinder bore clearance @ 43 mm from top -0.005 to + 0.025 mm (-0.0002 to + 0.0010 inch)
Ring end gap
Top 0.15-0.30 mm (0.0059-0.0118 inch)
Intermediate 0.15-0.30 mm (0.0059-0.0118 inch)
Oil control 0.15-0.30 mm (0.0059-0.0118 inch)
Ring groove width
Top 1.520-1.540 mm (0.0598-0.0606 inch)
Intermediate 1.520-1.540 mm (0.0598-0.0606 inch)
Oil control 3.03-3.055 mm (0.1193-0.1203 inch)
Ring width
Top 1.5 mm (0.05 inch)
Intermediate 1.5 mm (0.05 inch)
Ring-to-groove clearance
Top 0.020-0.060 mm (0.0008-0.0024 inch)
Intermediate 0.020-0.060 mm (0.0008-0.0023 inch)
Oil control 0.030-0.070 mm (0.0012-0.0028 inch)
Pin bore diameter 22.0065-22.0110 mm (0.8664-0.8666 inch)
Pin
Diameter 21.995-21.997 mm (0.8659-0.8660 inch)
Length 61.870-62.120 mm (2.4358-2.4456 inch)
Pin-to-piston fit 0.0095-0.016 mm (0.0004-0.0006 inch)
Piston-to-connecting rod clearance 6.58-7.58 mm (0.259-0.298 inch)
Diameter
Grade 1 90.191-90.206 mm (3.5508-3.5514 inch)
Grade 2 90.203-90.220 mm (3.5513-3.5519 inch)
Grade 3 90.217-90.232 mm (3.5518-3.5524 inch)
Piston-to-cylinder bore clearance @ 43 mm from top -0.005 to + 0.025 mm (-0.0002 to + 0.0010 inch)
Ring end gap
Top 0.15-0.30 mm (0.0059-0.0118 inch)
Intermediate 0.15-0.30 mm (0.0059-0.0118 inch)
Oil control 0.15-0.30 mm (0.0059-0.0118 inch)
Ring groove width
Top 1.520-1.540 mm (0.0598-0.0606 inch)
Intermediate 1.520-1.540 mm (0.0598-0.0606 inch)
Oil control 3.03-3.055 mm (0.1193-0.1203 inch)
Ring width
Top 1.5 mm (0.05 inch)
Intermediate 1.5 mm (0.05 inch)
Ring-to-groove clearance
Top 0.020-0.060 mm (0.0008-0.0024 inch)
Intermediate 0.020-0.060 mm (0.0008-0.0023 inch)
Oil control 0.030-0.070 mm (0.0012-0.0028 inch)
Pin bore diameter 22.0065-22.0110 mm (0.8664-0.8666 inch)
Pin
Diameter 21.995-21.997 mm (0.8659-0.8660 inch)
Length 61.870-62.120 mm (2.4358-2.4456 inch)
Pin-to-piston fit 0.0095-0.016 mm (0.0004-0.0006 inch)
Piston-to-connecting rod clearance 6.58-7.58 mm (0.259-0.298 inch)
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.