Original BMW Crankcase Vent Pipe for BMW 550i, 650i, 750i, Alpina B6, and Alpina B7 (2012–2019)

On the N63N engine, this Original BMW crankcase vent pipe links the valve cover to the intake tube as part of the positive crankcase ventilation (PCV) system in the BMW 550i, 650i, 750i, Alpina B6, and Alpina B7 (2012–2019). BMW calls it a vent pipe and sells it as a set; it is made in Germany and weighs 402 g (0.9 lb). Every engine builds crankcase pressure as a byproduct of combustion, and the PCV hoses carry that air, laden with oil vapor, back to the engine so it can be burned. That combination of heat, pressure, and oil vapor makes the vent hose a common failure item in the PCV system, and it matters to both engine performance and emissions compliance.

Original BMW Parts carry a 24-month parts warranty.

Production of this number began in August 2015, and it replaces the earlier 11-15-8-637-873. BMW rates that change as exchangeable retrospectively, meaning the newer pipe also fits cars that left the factory with the earlier part. Other BMW numbers that cross to this pipe include 11-15-7-640-285, 11-15-7-601-451, and 11-15-7-622-488, which helps when the number on a removed hose or an old invoice does not match. Within these models, the deciding factor is the N63N engine, and body style does not change the part.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-15-8-647-961
• BMW part name: vent pipe (crankcase ventilation)
• Function: connects the valve cover to the intake tube
• Engine: N63N
• Weight: 402 g (0.9 lb)
• Production start: August 2015
• Replaces: 11-15-8-637-873, exchangeable retrospectively
• Country of manufacture: Germany
• Sold as: one set
• Warranty: 24 months on Original BMW Parts

Installation & Tuning Notes

Plastic PCV parts turn brittle with heat and oil exposure, and the securing clips and connectors on these hoses break easily during removal or while other service work is done nearby. Oil residue and moisture on the hose, the engine block, and adjacent components usually mark a leaking vent pipe; in heavier cases the area may need degreasing before the exact leak point can be found.

Common Questions

What symptoms point to a failing crankcase vent pipe?
Unmetered air from a cracked or split pipe can set a check engine light for an intake air leak or another airflow fault. A severe leak causes rough running or a misfire, and in the worst cases you may smell burning oil.

Can a clogged PCV system affect this hose?
Yes. With age the PCV system can clog with blow-by deposits and oil sludge, and the individual hoses grow brittle and start to leak.

Fitment & Compatibility

Use the fitment table below to confirm year, model, submodel, and application notes before ordering. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.