1. Clean cover and screws in a non-volatile cleaning solution or solvent. Dry parts with low pressure compressed air.
2. Set a straightedge diagonally across the length of the breather cover intersecting the opposite corners of the gasket surface.
3. Slide a feeler gauge beneath the straightedge to check the breather cover flatness.
4. Repeat the step checking the opposite diagonal.
5. Replace the breather cover if warpage exceeds 0.005 in. (0.13 mm).
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