Gates EMH921 Engine Crankcase Vent Valve - Oil Separator

Gates EMH921 Crankcase Vent Valve Overview

The Gates EMH921 crankcase vent valve is an OE-exact emission control replacement for the crankcase ventilation system. Built from plastic with an oil separator design, it restores proper pressure regulation and ventilation flow for select BMW applications.

Compatible with 1999-2003 BMW 540i, oil separator; 1999-2001 BMW 740i, oil separator; and 1999-2001 BMW 740iL, oil separator. If you are searching for a BMW 540i crankcase vent valve or a BMW 740i oil separator replacement, Gates EMH921 provides the correct fitment profile for these applications.

Key Features

• OE-exact crankcase ventilation pressure regulator and oil separator replacement
• Plastic construction for application-specific fit and routing
• Two hose connectors for the listed BMW crankcase ventilation layouts
• Inside diameters: 18 mm (0.7 in) and 7 mm (0.26 in)
• Direct replacement part number: EMH921

Product Details

Gates EMH921 is part of the Gates Crankcase Vent Valve line, focused on restoring emission ventilation system operation to factory-style performance levels. The design follows OE dimensions for easier installation and proper connection to the existing hoses, helping maintain crankcase pressure control and oil separation in the ventilation circuit. This part cross-references Genuine 11151705272 for the same application.

Common Issues This Part Can Address

• Crankcase pressure regulation problems
• Oil vapor separation concerns in the ventilation system
• Rough idle caused by ventilation system faults
• Vacuum leaks related to worn crankcase ventilation components
• Emission system performance issues tied to a failed oil separator

Installation Notes and Tips

Verify hose routing and connector sizes before installation. Match the 18 mm and 7 mm inside diameter connections to the existing lines, and confirm the vehicle application against the listed BMW 540i, 740i, or 740iL fitment before replacing the original component. Inspect adjacent hoses and seals for wear while servicing the crankcase ventilation system.

Quality Assurance

Gates manufactures this part as an OE-exact replacement within its crankcase ventilation product line, with fit and function targeted to restore the emission ventilation system to desired operating levels for the listed BMW applications.