# 21631051 Key | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta Sea-Water Pump Shaft Key - Part Number: 21631051

  

A genuine shaft key used inside the belt-driven sea-water pump on Volvo Penta D13 marine generator engines. It locks the pump pulley or rotating component to the pump shaft so torque is transmitted without relative movement.

  

⚙️ Key Features

  

• Genuine Volvo Penta precision shaft key

• Used in sea-water pump 21347696

• Fits the keyed pump-shaft and pulley connection

• Transfers drive torque without relying on fastener friction alone

• Direct replacement for a worn, sheared or missing original key

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 21631051 (current OEM reference)

  

OEM / Related Numbers:

  

• 21347696 - sea-water pump / wear-part assembly

• 21633538 - pump body

• 21579156 - bearing housing

• 21578873 / 21578878 - ball bearings

• 21579159 - pulley

• 21640396 - pump shaft

• 21579170 - spacer sleeve

• 3830663 - impeller

• 3830459 - impeller kit

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta D13 marine-generator belt-driven sea-water pumps

  

Typically suits:

  

• Engine models:

• D13B-E MG

• D13B-E MG (FE)

• D13C1-A MG

  

• HP Range: Generator rating dependent

• Engine Type: 12.8L inline six-cylinder turbocharged marine generator diesel

• Year Range: Approximately 2009 - 2020

• Fitment Note: Inspect both keyways before installation; replacing the key alone will not correct a damaged shaft or pulley.

  

🔌 Function

  

Prevents the pulley or driven component from rotating independently of the pump shaft and preserves correct pump speed.

  

Common signs of failure:

  

• Pulley movement on the shaft

• Metallic clicking or drive loss

• Sheared or rolled key edges

• Damaged keyway in the shaft or pulley

• Reduced or complete loss of sea-water circulation

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 90.45 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 90.45 AUD | In stock |

## Images

- 21631051 Key | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21631051-key-genuine-volvo-penta)
> Updated: 2026-08-03