油分离器和通风管

发动机曲轴箱通气软管套件（银色盖子）

发动机曲轴箱通气软管是车辆曲轴箱强制通风 (PCV) 系统的关键部件。其主要作用是将加压气体从发动机曲轴箱输送至 PCV 阀（也称为油气分离器）。PCV 阀会捕获有害的油雾，将其排回发动机，并将净化后的空气重新引导至进气系统，以便在正常燃烧过程中燃烧。

如果没有正常工作的通气软管，您的发动机可能会出现性能问题、漏油，甚至排放故障。

为什么发动机曲轴箱通气软管如此重要

在燃烧过程中，发动机自然会产生曲轴箱正压。该压力与曲轴箱内的热量和油雾相结合。通气软管的设计旨在处理这种气流，并保持您的PCV系统高效运行。

然而，随着时间的推移，通气软管暴露在高温、油污和高压下，会成为常见的故障点。一旦损坏，可能会导致性能下降、发动机故障灯亮起以及排放增加。

曲轴箱通气软管故障的常见症状

• 裂缝、泄漏或断裂——随着时间的推移，热量和油会损坏橡胶或塑料，导致漏气。
• 连接器或夹子损坏——脆性塑料在使用过程中或由于老化可能会断裂。
• 可见损坏——软管可能会裂开、变软或变硬，从而产生明显的孔洞。
• 检查发动机灯 (CEL) – 泄漏的未计量空气通常会触发与进气相关的故障代码。
• 发动机失火或怠速不稳——严重的漏气会扰乱空气/燃料混合物，导致失火。

油污或异味——漏出的电子烟油会在软管、发动机缸体和附近的部件上留下油污。严重的情况下，你可能会闻到烧焦的油味。

为什么你不应该忽视呼吸软管

曲轴箱通气软管故障会影响发动机性能、燃油效率和排放合规性。如果不及时处理，可能会导致发动机长期损坏和昂贵的维修费用。

如果您注意到上述任何迹象，请务必检查并更换曲轴箱通气软管，这是定期 PCV 系统维护的一部分。

图表参考编号 13（气缸 1-4）或 14（气缸 5-8）

注意：此部件仅适用于 2009 款及以后生产的 957 Cayenne S/GTS 车型。不适用于配备银色 AOS 的早期车型。

Engine Crankcase Breather Hose Kit

The engine crankcase breather hose is a key part of your vehicle’s positive crankcase ventilation (PCV) system. Its main role is to route pressurized gases from the engine crankcase to the PCV valve (also called the air/oil separator). The PCV valve captures harmful oil  vapers , drains them back into the engine, and redirects the cleaned air to the intake system to be burned during normal combustion.

Without a properly functioning breather hose, your engine can develop performance issues, oil leaks, and even emissions failures.

Why the Engine Crankcase Breather Hose Matters

During combustion, engines naturally produce positive crankcase pressure. This pressure combines with heat and oil vapers inside the crankcase. The breather hose is designed to handle this flow and keep your PCV system working efficiently.

Over time, however, exposure to heat, oil, and pressure makes the breather hose a common failure point. When damaged, it can cause poor performance, check engine lights, and increased emissions.

Common Symptoms of a Failing Crankcase Breather Hose

• Cracks, leaks, or breaks – Heat and oil vapers degrade rubber or plastic over time, leading to air leaks.
• Broken connectors or clips – Brittle plastic can snap during service or due to age.
• Visible damage – Hoses may split, soften, or harden, creating noticeable holes.
• Check Engine Light (CEL) – Unmetered air from a leak often triggers intake-related fault codes.
• Engine misfires or rough idle – Severe air leaks upset the air/fuel mixture, causing misfires.

Oil residue or odour – Escaping vapers leave oily deposits on the hose, engine block, and nearby components. In severe cases, you may smell burning oil.

Why You Shouldn’t Ignore a Bad Breather Hose

A faulty crankcase breather hose affects engine performance, fuel efficiency, and emissions compliance. Left untreated, it can cause long-term engine damage and costly repairs.

If you notice any of the above signs, it’s important to inspect and replace your crankcase breather hose as part of regular PCV system maintenance.

Diagram ref no 13 (Cyl 1-4) or 14 (Cyl 5-8)

NOTE: This part is compatible only with 957 Cayenne S/GTS models produced from the 2009 model year onwards. It is not compatible with earlier models equipped with the silver AOS.