21915994 Propeller | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Type NS4 Rear 4-blade NiBrAl IPS Propeller, part number 21915994. A genuine Volvo Penta Type NS4 rear propeller manufactured from nickel-bronze-aluminium for IPS 15 pod drives. It uses a 4-blade design and must be operated with matching Type NS4 propeller 21915974.

⚙️ Key Features

• Factory blade area, pitch progression and hub geometry

• Designed for matched front and rear counter-rotating operation

• Balanced genuine Volvo Penta propeller

• Application-specific material and blade count

• Must be paired with the matching propeller size and series

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 21915994 (current OEM reference)

OEM / Related Numbers:

• 21916044 - complete Type NS4 propeller set

• Set contents: 21915994 - rear propeller; 21915974 - matching front propeller

• 21815881 - propeller cone

• 963699 - cone socket screw

• 21815875 - front propeller nut

• 21816205 - felt washer

• 21913550 - line cutter

• 21815872 - rear propeller nut

• 21808200 - flow deflector

• 963696 - rear socket screw

• 23284156 - propeller locking fluid

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Volvo Penta IPS 15 pod-drive propeller systems with D8 marine engines

Typically suits:

• Engine / drive models:

• IPS600

• IPS650

• IPS700

• IPS 15 installations using Type NS propellers

• HP Range: Approximately 550HP - 700HP engine packages

• Engine Type: Volvo Penta D8 marine diesel with IPS 15 pod drive

• Year Range: Approximately 2016 - current supported applications

• Serial / Fitment Note: Install only with the matching Type NS4 propeller. Type N and NS propellers are selected for IPS 15 D8 applications and must not be mixed across sizes.

🔌 Function

Converts engine torque into forward or reverse thrust while the counter-rotating pair balances torque and maintains efficient water flow through the drive.

Common signs of failure:

• Vibration or propeller-shaft noise

• Bent, cracked or eroded blades

• Cavitation burns or edge damage

• Engine unable to reach the specified full-load rpm

• Hub movement, impact damage or galvanic corrosion

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging