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