# 21665581 Breather Pipe | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine formed breather pipe used in the closed crankcase-ventilation system on Volvo Penta generator-drive engines. It forms a separate section of the crankcase-ventilation route to the oil separator while maintaining the designed slope, bore and connection alignment.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD750GE
-   Volvo Penta TAD751GE

-   **Engine Family:** TAD
-   **Year Range:** Approximately 2008 - 2020

## ⚙️ Key Features

-   Genuine Volvo Penta crankcase-ventilation pipe
-   Factory bend and connection geometry
-   Resistant to hot oil mist and crankcase vapour
-   Works with the specified oil separator and drain system
-   Direct replacement for a cracked, restricted or leaking original pipe
-   Engine type: 5.1L inline four-cylinder or 7.15L inline six-cylinder turbocharged generator diesel

## 🔌 Function

Forms a separate section of the crankcase-ventilation route to the oil separator, allowing oil mist to be separated and crankcase pressure to remain controlled.

## ⚠️ Common Signs of Failure

-   Oil mist leakage
-   Excess crankcase pressure
-   Oil residue around the pipe joints
-   Internal sludge restriction
-   Cracking or vibration fatigue

## 🛠️ Service Notes

-   Route the new pipe exactly as the original ran, with no kinks and no sagging low point where oil or condensate can collect and block the flow
-   Support the pipe with its original clips and keep it clear of hot surfaces and moving parts; a chafed or melted breather puts oil mist into the engine space
-   Make sure both connections are clean, sealed and clamped — a leaking breather makes an oily mess and upsets crankcase pressure
-   Clean out the breather housing, hose stub or oil separator while the pipe is off; blocked crankcase ventilation pressurises the crankcase and pushes oil past seals and the dipstick
-   Check the joints again after the first run at temperature, when the pipe is soft and connections can settle

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   20930510 - oil separator
-   21038626 - separator gasket
-   21012774 - oil lines
-   22253980 - oil lines
-   22393475 - oil lines
-   21496705 - drain pipe
-   20971632 - ventilation hose

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 170.63 AUD
- **Vendor:** Volvo Penta
- **Type:** Hoses & Pipes
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 170.63 AUD | In stock |

## Images

- 21665581 Breather Pipe | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21665581-breather-pipe-genuine-volvo-penta)
> Updated: 2026-10-11