21631051 Key | Genuine Volvo Penta Part

🔧 Product Description

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.

🚤 Compatibility

Typically suits:

• Volvo Penta D13B-E MG
• Volvo Penta D13B-E MG (FE)
• Volvo Penta D13C1-B MG
• Volvo Penta D13C3-B MG
• Volvo Penta D13C1-A MG
• Volvo Penta D13B-N MH
• Volvo Penta D13C1-A MH
• Volvo Penta D13C3-B MH
• Volvo Penta D13C1-B MH

• Engine Family: D
• Year Range: Approximately 2009 - 2020

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

🔌 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

🛠️ Service Notes

• Keep at least one spare key aboard and another ashore; a lost key with no spare stops the boat
• Check the key turns smoothly through every position and cannot be withdrawn other than where it should be
• Rinse salt off and keep the barrel clean with a light dry lubricant rather than oil or grease, which holds grit in the lock
• Do not hang a heavy fob or lanyard on it — side load wears a switch barrel out and is a common cause of switch failure
• Order replacements against the key or switch number for your engine, as patterns differ between control and switch types

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21347696 - sea-water pump / wear-part assembly
• 21633538 - pump body
• 21579156 - bearing housing
• 21578873 - ball bearings
• 21578878 - ball bearings
• 21579159 - pulley
• 21640396 - pump shaft
• 21579170 - spacer sleeve
• 3830663 - impeller
• 3830459 - impeller kit

📦 Condition

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