# 21164656 Plug | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta Hydraulic Helm Vented Filler Plug - Part Number: 21164656

  

A vented reservoir filler plug for Volvo Penta hydraulic helm pumps. It closes the fill opening while permitting controlled air exchange as the fluid volume changes, preventing pressure or vacuum from building in the helm reservoir.

  

⚙️ Key Features

  

• Vented filler plug for hydraulic helm pumps

• Allows controlled reservoir breathing

• Correct thread and seal for the Volvo Penta helm body

• Supports bleeding and normal fluid expansion

• Different function from non-vented plug 3843214

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 21164656 (current OEM reference)

  

OEM / Related Numbers:

  

• 21164656

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

Assembly / Service Components:

  

• 3843214 - non-vented filler plug, not a direct functional substitute

• 22275071 - front-mount 33 cc helm pump

• 22275074 - rear-mount 33 cc helm pump

• 22275077 - tilt-mount 33 cc helm pump

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta hydraulic steering helm system

  

Typically suits:

  

• Engine models:

• D1-13F

• D1-30F

• D2-40F

• D2-50F

• D2-55F

• D2-60F

• D2-75F

• D4-230I-G

• D8A3-A MP

• D13C2-B MP

• Volvo Penta front-mount 33 cc helm pump

• Volvo Penta rear-mount 33 cc helm pump

• Volvo Penta tilt-mount 33 cc helm pump

  

• HP Range: Not a selection criterion

• Engine Type: Volvo Penta hydraulic steering helm system

• Year / Serial Range: Vented versus non-vented filler arrangement and helm-pump type must be confirmed from the steering diagram.

  

🔌 Function

  

Seals the helm-pump reservoir while allowing controlled venting of the fluid space.

  

Common signs of failure:

  

• Oil, coolant, hydraulic fluid or gas leakage

• Loss of pressure or contamination entry

• Hardened, flattened, cracked or extruded sealing material

• Damaged thread or mating surface

• Recurring leakage after incorrect torque or surface preparation

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 42.59 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 42.59 AUD | In stock |

## Images

- 21164656 Plug | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21164656-plug-genuine-volvo-penta)
> Updated: 2026-08-02