Bmw B58 Pcv Tappet Cover Repair Kits

BMW B58 Gen 1 PCV diaphragm repair kits engineered for direct fitment to OEM tappet/valve covers. These kits replace the failed crankcase pressure regulating diaphragm without requiring complete valve cover replacement, restoring proper crankcase ventilation and eliminating symptoms like rough idle, pressure imbalance, whistling noises and excessive oil consumption. Designed exclusively for BMW B58 Gen 1 engines found in M140i, M240i, 340i, 440i, 540i and other applicable Gen 1 B58 variants. Each kit includes the replacement diaphragm assembly for seamless integration into your existing tappet cover. ⚠️ Not compatible with B58TU/Gen 2 applications due to crankcase ventilation and valve-cover design differences. Verify your engine generation before ordering.