B58 PCV Valve Cover Diaphragm Replacement Part 11127645173 Compatible with BMW 3.0L Engine

Crankcase ventilation on the B58 runs through a diaphragm built into the valve cover assembly. It is a thin membrane doing a hard job in a hot place, and once it tears the engine starts drawing air it has not measured. This is an aftermarket replacement supplied against reference number 11127645173.

What the reference number covers

11127645173 appears twice in the supplier's data, once as a reference part number and once labelled OEM. Read it as a cross-reference for matching your own part, not as a statement of origin, because nothing in the source says this component was made by or for the vehicle manufacturer. The supplier gives no model list, no build years and no engine code beyond B58 3.0L, so checking that number against the part you are removing is the only reliable way to confirm you have the right item.

Two materials, one assembly

Construction is listed as ABS and metal, and the supplier describes the part as offering protection against leakage and corrosion. Pairing a rigid engineering plastic with metal is ordinary for a component that has to hold a seal against a machined face while riding out repeated heat cycles under the bonnet. What is not published is which portion is which, whether any gasket or seal is included, and what the fasteners should be torqued to, so work to the specification for your own engine rather than assuming.

Key features

• Cross-referenced part: matched to 11127645173 for identifying the correct item.
• ABS and metal construction: as listed by the supplier, for a part that sits in the engine bay heat.
• Single item: one unit per pack.
• Aftermarket replacement: not a genuine or factory-supplied component.

Specifications

• Reference part number: 11127645173 (listed by the supplier as both a reference and an OEM number)
• Material: ABS and metal
• Engine application (supplier): B58 3.0L
• Stated measurement tolerance: 1 mm
• Dimensions, weight, colour and included seals: not published by the supplier
• Vehicle models and build years: not published by the supplier

What's in the box

• 1 x PCV valve cover, as worded in the supplier's pack list

Before you fit this

• The title describes a diaphragm while the supplier's pack list describes a complete PCV valve cover. These are not interchangeable, so confirm which item you need against part number 11127645173 before ordering.
• No models or build years are published, only the B58 3.0L engine code. Check your engine code rather than your badge.
• No torque figure or gasket is listed. Use the specification for your engine and source seals separately if needed.
• Fitting should be done by a qualified person and the engine checked for leaks before the vehicle goes back on the road.

Match the number against your own part first. With that confirmed, it is a serviceable replacement for a tired crankcase ventilation component.

Returns, Refunds and Replacements

Products that are received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with the Australian Consumer Law (ACL). We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. However, please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.

Delivery Timeframe

Please note that we cannot guarantee the exact date of arrival, and the delivery timeframes (excluding weekends and public holidays) are as follows:

• For customers in Victoria, approximately 7-10 working days;
• For customers in NSW, SA, ACT, and QLD, approximately 9-12 working days;
• For customers in WA, NT, and TAS, approximately 9-12 working days.