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.
Piston Fitting
The pistons are "select fit" to achieve proper oil clearance. Engine block cylinder bore diameter grade markings (1) are stamped into the left side of the engine block. These marks are read from left to right, corresponding with cylinder number 1, 2, 3, 4, 5, 6.
Engine block cylinder bore diameter grade markings correspond to specific cylinder bore diameters. The chart below identifies the two engine block grade markings and their associated cylinder bore diameters.
| Engine Block Marking | Cylinder Bore Size mm (in.) |
|---|---|
| 1 | 95.995 ± 0.005 mm (3.7793 ± 0.0002 in.) |
| 2 | 96.005 ± 0.005 mm (3.7797 ± 0.0002 in.) |
The piston is marked with the piston size (1 and 2) on the piston crown. The pistons are available in two different sizes in order to achieve the desired oil clearance. Select the piston size that corresponds to the engine block cylinder bore diameter grade markings for each cylinder.
Pistons are available in two sizes. The chart below identifies the two piston sizes.
| Piston Marking | Size mm (in.) | |
|---|---|---|
| Metal to Metal | Metal to Coating | |
| 1 | 95.995 ± 0.005 mm (3.7793 ± 0.0002 in.) | 95.970 - 96.000 mm (3.7783 - 3.7795 in.) |
| 2 | 95.965 ± 0.005 mm (3.7781 ± 0.0002 in.) | 95.980 - 96.010 mm (3.7787 - 3.7835 in.) |
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.