11127792420 / 11127792426 Valve Cover Diaphragm for BMW E65 745d M67N
This valve cover diaphragm is designed for BMW E65 745d with the M67N 4.4L V8 diesel engine using OEM references 11127792420 and 11127792426. It replaces the failed PCV membrane in the valve cover crankcase ventilation system.
This product is the diaphragm only. It is not a complete valve cover assembly or full crankcase ventilation unit.
OEM / Reference Numbers
Primary OEM / valve cover reference numbers:
- 11127792420
- 11127792426
Alternative BMW OEM formats:
- 11 12 7 792 420
- 11 12 7 792 426
Product reference:
- SKU: KL11127792420
Part Type
- valve cover diaphragm
- PCV membrane
- crankcase ventilation diaphragm
- engine breather membrane
- valve cover PCV repair component
What This Part Does
The valve cover diaphragm regulates crankcase pressure and supports correct blow-by gas flow through the PCV system. When the diaphragm fails, pressure imbalance can cause oil leaks, crankcase fault codes and oil vapor issues.
Replacing the failed diaphragm helps restore PCV pressure regulation while keeping the existing valve cover in service.
Compatible Vehicles
This valve cover diaphragm is listed for BMW E65 745d with the M67N 4.4L V8 diesel engine.
- BMW 7 Series E65 745d M67N 4.4L V8 diesel
Engine / Engine Family / Technical Detail
- BMW M67N
- BMW 4.4L V8 diesel
- Membrane diameter: 89 mm
Common Symptoms of Failure
- oil leaks
- crankcase fault codes
- incorrect crankcase pressure
- rough or unstable idle
- increased oil consumption
- oil vapor issues in the intake system
Why Choose This Replacement
- Targets exact repair intent for 11127792420 and 11127792426
- Replaces the failed 89 mm PCV diaphragm in the existing valve cover
- Cost-effective alternative to replacing the complete valve cover when only the diaphragm has failed
- Helps restore crankcase ventilation and pressure control
- Suitable for BMW E65 745d M67N 4.4L V8 diesel applications
Important Before Ordering
- Check that your original valve cover reference matches 11127792420 or 11127792426.
- Confirm that your vehicle is BMW E65 745d with M67N 4.4L V8 diesel engine.
- Compare the 89 mm diaphragm with the membrane installed in your original valve cover.
- This product is a valve cover diaphragm only, not a complete valve cover assembly.
- Verify compatibility by OEM number, engine type and part design before ordering.
FAQ
What do BMW 11127792420 and 11127792426 fit?
BMW 11127792420 and 11127792426 are listed for valve cover diaphragm repair on BMW E65 745d with the M67N 4.4L V8 diesel engine.
Is 11 12 7 792 426 the same as 11127792426?
Yes. 11 12 7 792 426 is the spaced BMW OEM format of 11127792426, and 11 12 7 792 420 is the spaced format of 11127792420.
What does this valve cover diaphragm do?
The diaphragm regulates crankcase pressure and supports blow-by gas flow through the valve cover PCV system.
What symptoms indicate valve cover diaphragm failure on BMW E65 745d?
Common symptoms include oil leaks, crankcase fault codes, incorrect crankcase pressure, increased oil consumption and oil vapor issues.
Is this a complete valve cover assembly?
No. This product is the valve cover diaphragm / PCV membrane only. It is not a complete valve cover assembly.
How do I confirm compatibility before ordering?
Confirm OEM number 11127792420 or 11127792426, check that the vehicle is BMW E65 745d M67N 4.4L V8 diesel, and compare the 89 mm diaphragm with your original membrane.
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Orders ship within 1–2 business days.
Standard delivery:
- USA: Some items ship from our US warehouse and arrive within 3 business days.
- USA-EU: 10–21 business days
- Worldwide: 14–30 business days
Shipping cost is shown at checkout.
Can I exchange or return an item?
Yes, you can exchange or return an item within 14 days of purchase. This right is guaranteed to you by the Law on the Protection of Consumer Rights
To use this feature, please make sure that:
- the product was not in use and has no traces of use: scratches, chips, abrasions, etc.
- the goods are fully completed and the integrity of the packaging is not violated
- retained all labels and factory markings