Cylinder Head Deck Flatness Inspection
WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the cylinder head deck surface for flatness. Refer to Engine Mechanical Specifications (L5Q)Engine Mechanical Specifications (LV7) . Replace the cylinder head if it is out of specification. Do NOT machine the cylinder head.
- Ensure the cylinder head decks are clean and free of gasket material.
- Inspect the surface for any imperfections or scratches that could inhibit proper cylinder head gasket sealing.
- Place a straight-edge diagonally across the cylinder head deck face surface (1).
- Measure the clearance between the straight-edge and the cylinder head deck face using a feeler gauge at 4 points along the straight-edge.
- If the warpage is less than 0.05 mm (0.002 in), the cylinder head deck surface does not require resurfacing.
- If the warpage is between 0.05 - 0.20 mm (0.002 - 0.008 in) or any imperfections or scratches that could inhibit proper cylinder head gasket sealing are present, the cylinder head deck surface requires resurfacing. The maximum amount that can be removed is 0.25 mm (0.010 in).
- If the cylinder head deck surface requires more than 0.25 mm (0.010 in) material removal the head must be replaced.