Deck Flatness Inspection
WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
Ensure the engine block 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 engine block deck face surface.
- Measure the clearance between the straight-edge and the engine block 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 engine block 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 engine block deck surface requires resurfacing.
- If resurfacing is required the maximum amount that can be removed is 0.25 mm (0.010 in).
- If the engine block deck surface requires more than 0.25 mm (0.010 in) material removal the block must be replaced.