Crankcase Ventilation Membrane – BMW M51 Diesel | OEM 11122246330 3911171906 2246619

11122246330 PCV Membrane for BMW M51 E36, E34, E39, E38

This crankcase ventilation membrane is designed for BMW M51 diesel engines using OEM reference 11122246330. It replaces the failed diaphragm in the crankcase ventilation system and helps restore correct pressure control.

This product is the membrane only. It is not a complete crankcase ventilation valve, complete oil separator, or full breather assembly.

OEM / Reference Numbers

Primary OEM number:

• 11122246330

Secondary OEM / reference numbers:

• 11129069261
• 11122243202
• 11 12 2 246 330
• 11 12 9 069 261
• 11 12 2 243 202

Additional reference numbers:

• 3911171906
• 2246619

Product reference:

• SKU: KL11122246330

Part Type

• crankcase ventilation membrane
• PCV membrane
• oil separator diaphragm
• engine breather membrane
• BMW M51 crankcase ventilation diaphragm

What This Part Does

The crankcase ventilation membrane helps regulate crankcase pressure and controls blow-by gas flow through the diesel engine breather system. When the original membrane becomes worn or torn, pressure control can be disrupted and the engine may show ventilation-related issues.

Replacing the membrane helps restore the function of the existing crankcase ventilation unit while avoiding unnecessary replacement of the complete assembly.

Compatible Vehicles

This PCV membrane is listed for BMW M51 diesel engine applications.

• BMW E36 with M51 diesel engine
• BMW E34 with M51 diesel engine
• BMW E39 with M51 diesel engine
• BMW E38 with M51 diesel engine

Engine / Engine Family

• BMW M51 diesel

Common Symptoms of Failure

• incorrect crankcase pressure
• increased oil consumption
• oil vapor issues in the intake system
• rough or unstable idle
• oil leaks caused by pressure imbalance
• crankcase ventilation malfunction symptoms

Why Choose This Replacement

• Targets the exact repair intent for 11122246330
• Supports related BMW references 11129069261 and 11122243202
• Replaces the failed membrane inside the existing crankcase ventilation system
• Cost-effective alternative to replacing the complete ventilation assembly when only the diaphragm has failed
• Suitable for BMW M51 diesel PCV membrane repair

Important Before Ordering

• Check that your original crankcase ventilation component matches 11122246330 or one of the listed reference numbers.
• Confirm that your vehicle uses a BMW M51 diesel engine.
• Compare the membrane design with the diaphragm installed in your original part.
• This product is a membrane only, not a complete crankcase ventilation assembly.
• Verify compatibility by OEM number, engine type and part design before ordering.

FAQ

• BMW

Returns and exchanges

Request a change-of-mind return within 14 calendar days of delivery, then send the goods within 14 calendar days of notifying us. Our voluntary return option applies to unused, uninstalled, complete goods in their original condition and packaging. Exchanges are subject to availability and agreement.

The customer pays change-of-mind return shipping. No restocking fee applies. Refunds and original delivery charges are handled under our Refund & Return Policy and applicable law.

Faulty, damaged or incorrect goods

Email contact-us@klifex.net with your order details and a description of the problem. These claims are separate from change-of-mind returns. Where we are responsible, we bear the required remedy and return costs. Installation alone does not remove mandatory defect rights.

Your legal rights

Applicable statutory rights take precedence, including EU/EEA and UK withdrawal rights and legal guarantees. Necessary inspection does not remove a statutory withdrawal right; deductions for excessive handling must reflect an actual, evidenced loss of value.

Contact us for the correct return address before shipping. Our legal address is not a return address.

Read the full Refund & Return Policy