11127568579 / 11127521086 PCV Diaphragm Repair Kit for BMW N45, M56
This PCV diaphragm repair kit is designed for BMW N45 and M56 engine applications using OEM references 11127568579 and 11127521086. It repairs the crankcase ventilation diaphragm in the existing valve cover and helps restore proper PCV system operation.
The product is intended for targeted repair of the valve cover PCV area. It is not a complete valve cover assembly or complete crankcase ventilation valve.
OEM / Reference Numbers
Primary OEM numbers:
- 11127568579
- 11127521086
Secondary OEM / valve cover reference numbers:
- 11127526665
- 11127509524
- 11127526667
- 11127568580
- 11127565742
- 11127777347
Product reference:
- SKU: KL1112756857911127521086
Part Type
- PCV valve repair kit
- PCV diaphragm repair kit
- crankcase ventilation diaphragm
- valve cover membrane repair kit
- engine breather diaphragm repair component
What This Part Does
The PCV diaphragm regulates crankcase pressure and controls blow-by gas flow through the valve cover ventilation system. A failed membrane can cause vacuum imbalance, unstable engine operation, oil consumption and pressure-related issues.
Replacing the diaphragm helps restore correct crankcase ventilation while keeping the existing valve cover in service.
Compatible Vehicles
This PCV repair kit is listed for BMW N45 and M56 engine applications using compatible valve cover designs.
- BMW N45 engine applications
- BMW M56 engine applications
Specific model-year fitment should be confirmed by checking the original valve cover number and comparing the repair kit design.
Engine / Engine Family
- BMW N45
- BMW M56
Common Symptoms of Failure
- rough idle
- unstable engine operation
- vacuum leak symptoms
- oil burn or increased oil consumption
- incorrect crankcase pressure
- whistling noise from the valve cover area
Why Choose This Replacement
- Targets exact repair intent for 11127568579 and 11127521086
- Repairs the failed PCV diaphragm in the existing valve cover
- Cost-effective alternative to replacing the complete valve cover when only the membrane has failed
- Helps restore crankcase ventilation and pressure control
- Supports BMW N45 and M56 valve cover PCV repair applications
Important Before Ordering
- Check that your original valve cover reference matches 11127568579, 11127521086 or one of the listed related numbers.
- Confirm that your vehicle uses a compatible BMW N45 or M56 engine.
- Compare the repair kit design with the diaphragm area of your original valve cover.
- This product is a PCV repair kit, not a complete valve cover assembly.
- Verify compatibility by OEM number, engine type and part design before ordering.
FAQ
What do BMW 11127568579 and 11127521086 fit?
BMW 11127568579 and 11127521086 are listed for PCV diaphragm repair applications on compatible BMW N45 and M56 valve cover designs.
Is 11127521086 the same type of part as 11127568579?
Both numbers are used as primary references for this PCV diaphragm repair kit. Compatibility depends on the valve cover design and engine application.
What does this PCV valve repair kit do?
It replaces the failed diaphragm in the valve cover PCV system and helps restore correct crankcase ventilation pressure regulation.
What symptoms indicate PCV diaphragm failure?
Common symptoms include rough idle, unstable engine operation, vacuum leak symptoms, increased oil consumption, oil burn and whistling noise from the valve cover area.
Is this a complete valve cover assembly?
No. This product is a PCV diaphragm repair kit. It is not a complete valve cover assembly or complete crankcase ventilation valve.
How do I confirm compatibility before ordering?
Check the original valve cover reference number, confirm the engine type, and compare the repair kit design with the diaphragm area of your existing valve cover.
Read All
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