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BMW B58 Gen 1 PCV Repair Kit – Cylinder Head Cover Diaphragm

Name: BMW B58 Gen 1 PCV Repair Kit – Cylinder Head Cover Diaphragm
SKU: 8571
Price: 25.99 EUR
Availability: InStock

25,99 €

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BMW B58 Gen 1 PCV Repair Kit – Replace the diaphragm in your cylinder head cover

The PCV (Positive Crankcase Ventilation) system, also known as the cylinder head cover ventilation system, plays a vital role in the proper operation of your BMW.

On first-generation BMW B58 engines, the PCV control valve is integrated into the cylinder head cover. It regulates internal engine pressure and manages oil vapors from the oil pan.

Over time and due to thermal cycles, the rubber membrane may lose its elasticity, deteriorate, or crack. This failure can disrupt pressure regulation and lead to various malfunctions.

Our BMW B58 Gen 1 PCV repair kit allows you to replace the affected components without having to replace the entire cylinder head cover.

https://macote.fr/valve-pcv-bmw-b58-comment-identifier-une-panne-de-la-membrane-pcv-et-solutions-de-reparation/

Why Replace the PCV Membrane in Your BMW B58?

A damaged PVC membrane can cause several symptoms:

Engine Whistling: A cracked membrane can cause air to enter and produce an unusual whistling sound near the cylinder head cover.
Unstable idle: Improper pressure regulation can disrupt engine operation.
Excessive oil consumption: A faulty PCV system can cause vapors and oil to be drawn into the intake.
Excessive depression: A faulty membrane can cause improper regulation of the crankcase pressure.
Blue exhaust smoke: In some cases, faulty ventilation can cause oil to enter the intake and be burned.

If you notice these symptoms, it is recommended that you check the PCV system and measure the crankcase pressure before proceeding with the replacement.

An alternative to completely replacing the cylinder head cover

On the BMW B58 Gen 1, the PCV system is integrated into the BMW cylinder head cover.

When the control membrane is defective, replacing the entire cylinder head cover can be a costly repair.

Our repair kit allows you to work directly on the PCV system by replacing the affected components, while retaining the original cylinder head cover if it is still in good condition.

This allows you to avoid having to systematically replace the entire cylinder head cover due to a localized failure in the ventilation system.

Contents of the PVC Repair Kit

The kit includes the components needed to repair the PCV control system:

Replacement PVC rubber membrane.
Membrane holder.
Control spring.
Closure cap.

The components are designed to replace the corresponding parts in the original PCV system.

OEM Part Numbers and Compatibility

This kit is designed for first-generation BMW B58 engines (B58 Gen 1, pre-TU).

Original BMW Part Numbers:

Reference	Description
11121025447	PVC Repair Kit
11127645173	Cylinder head cover with integrated PCV system

These part numbers allow you to identify the corresponding original equipment. Always check the part number installed on your vehicle before placing an order.

List of Compatible Vehicles

BMW 1 Series

M140i (F20 / F21): 2016–2019

BMW 2 Series

M240i / M240i xDrive (F22 / F23): 2016–2019

BMW 3 Series

340i / 340i xDrive (F30 / F31): 2016–2018
340i xDrive Gran Turismo (F34): 2017–2019

BMW 4 Series

440i / 440i xDrive Coupe (F32): 2016–2020
440i / 440i xDrive Convertible (F33): 2016–2020
440i / 440i xDrive Gran Coupé (F36): 2016–2020

BMW 5 Series

540i / 540i xDrive (G30 / G31): 2017–2019

BMW 6 Series

640i GT / 640i xDrive Gran Turismo (G32): 2018–2019

BMW 7 Series

740i / 740Li (G11 / G12): 2016–2019

BMW X3

X3 M40i (G01): 2018–2019

BMW X4

X4 M40i (G02): 2019

The years listed are approximate model years. Exact production dates vary by chassis and market.

Please note: This kit is intended for B58 Gen 1 applications only. It should not be confused with the PCV systems used in B58TU (Technical Update) engines and later generations.

Compatibility must be confirmed based on the VIN, the production date, and the cylinder head cover part number.

Technical data

Product: PCV Valve Repair Kit
Application: BMW B58 Gen 1 (pre-TU)
Function: Engine crankcase ventilation and pressure regulation
Location: Cylinder head cover
OEM part number for the kit: 11121025447
OEM part number for the cylinder head cover: 11127645173
Type of repair: Replacement of the affected PCV components
Installation: On the PCV system integrated into the original cylinder head cover

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FAQs

FAQ

FAQ – BMW B58 Gen 1 PVC Repair Kit

1. What is the purpose of the PCV valve on a BMW B58 engine?

The PCV (Positive Crankcase Ventilation) valve is a component of the engine crankcase ventilation system. It regulates the pressure inside the engine and recovers oil vapors, redirecting them to the intake system.On the BMW B58 Gen 1, the PCV control diaphragm is integrated into the cylinder head cover. Its proper functioning is essential for maintaining the correct pressure in the engine crankcase.

2. What are the symptoms of a faulty PCV membrane on a BMW B58?

A cracked or damaged PVC membrane can cause several symptoms:

A high-pitched whistling sound coming from the cylinder head cover.
Unstable idle or irregular engine operation.
Excessive vacuum in the engine crankcase.
Abnormal oil consumption.
Blue or whitish smoke from the exhaust.
Engine warning light or loss of power in some cases.

These symptoms may have other causes. A diagnostic check of the ventilation system is recommended before any repairs are made.

3. Why replace only the PCV membrane instead of the entire cylinder head cover?

On the BMW B58 Gen 1, the PCV valve is integrated into the original cylinder head cover. If the diaphragm fails, some mechanics replace the entire cylinder head cover.A PCV repair kit allows you to work directly on the affected control components without automatically replacing the entire cylinder head cover, provided that it is still in good condition.This is a targeted repair solution that can help reduce the cost of the repair.

4. What components are included in the PCV repair kit?

The kit includes the components needed to replace the PCV system in question:

A replacement PVC membrane.
A membrane support.
A control spring.
A cap.

It allows you to replace the corresponding parts of the original system without having to replace the entire cylinder head cover.

5. What is the BMW OEM part number for this PCV kit?

The two main references you need to know are:

11121025447 : BMW part number for the PCV valve repair kit.
11127645173 : BMW part number for the cylinder head cover with integrated PCV system.

These part numbers make it easier to identify the part and verify its compatibility with your vehicle.

6. Which BMW models are compatible with this B58 Gen 1 PCV kit?

This kit is designed for BMWs equipped with the first-generation B58 engine (pre-TU), specifically:

BMW M140i F20 / F21 (2016–2019).
BMW M240i F22 / F23 (2016–2019).
BMW 340i F30 / F31 / F34 (2016–2019).
BMW 440i F32 / F33 / F36 (2016–2020).
BMW 540i G30 / G31 (2017–2019).
BMW 640i GT G32 (2018–2019).
BMW 740i / 740Li G11 / G12 (2016–2019).
BMW X3 M40i G01 (2018–2019).
BMW X4 M40i G02 (2019).

The years listed are for reference only. Exact compatibility depends on the production date and part number of the cylinder head cover.

7. Is this kit compatible with BMW B58TU engines?

No, this kit is intended for BMW B58 Gen 1 engines, also known as pre-TU (Technical Update) B58 engines.B58TU engines feature an updated architecture and ventilation system. Therefore, compatibility should not be assumed.Always check the part number of your cylinder head cover before ordering.

8. Is it necessary to replace the cylinder head cover after a PCV diaphragm failure?

Not necessarily.If the cylinder head cover is intact and the problem stems solely from the diaphragm or replaceable control components, a PCV repair kit may be sufficient.However, if the cylinder head cover has a crack, is warped, is leaking oil, or has damage to its integrated components, a complete replacement may be necessary.A preliminary inspection will help determine the appropriate repair.