21915974 Propeller | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta three-blade nibral propeller for Volvo Penta IPS 15, the front half of the type NS4 counter-rotating pair. It is machined from the specially developed nibral (nickel-bronze-aluminium) alloy Volvo Penta uses for its IPS propellers, which gives minimum growth, excellent durability and corrosion resistance. Volvo Penta IPS turns the propellers round to a forward-facing position, so the twin counter-rotating propellers pull the boat through the water rather than push it, and optimal interaction between the front and rear propeller holds performance and fuel efficiency across the whole speed range.

🚤 Compatibility

Typically suits:

• Volvo Penta IPS15-C
• Volvo Penta D8A2-A MP
• Volvo Penta D8A4-A MP
• Volvo Penta IPS15-B
• Volvo Penta IPS15-A
• Volvo Penta D8A8-A MP

• Engine Family: IPS, D
• HP Range: Approximately 550-700 HP
• Year Range: Approximately 2016 - current supported applications

⚙️ Key Features

• Type NS4 front propeller for Volvo Penta IPS 15
• Three blade design in Nibral nickel bronze aluminium
• For D8 engine packages
• 21.722 kg
• Type N and NS are DNV type approved for D8 IPS600, IPS650 and IPS700
• Matching Type NS4 rear propeller is 21915994; complete set is 21916044
• Includes flow deflector to reduce shaft seal wear
• Extremely strong and specially developed nibral (nickel-bronze-aluminium) alloy.
• Minimum growth, excellent durability and corrosion resistance.
• Fully CNC machined and precisely balanced.
• The type N/NS propeller is type approved by DNV for D8 IPS600, IPS650 and IPS700.
• Material: nibral
• Fits: Volvo Penta IPS 15 (D8 engines)
• Type: NS4
• Set contains: set 21916044, rear 21915994

🔌 Function

Turns as the forward half of the counter-rotating pod pair, working in clean water ahead of the drive and carrying the larger share of the job of turning engine power into thrust.

⚠️ Common Signs of Failure

• Vibration through the hull that rises with revs and eases when you throttle back
• Loss of top speed, or a boat slow to come onto the plane at the usual revs
• Blade tips bent, chipped or curled after touching bottom or striking debris
• Blade faces pitted or eroded by cavitation, usually near the leading edge
• Propeller hard to draw off, with corrosion or fretting on the shaft splines

🛠️ Service Notes

• Keep the pair to the same Type code - the range runs NS4, NS5, N1, N2, N3, N4, N5, N6 and N7, and running one code against another changes how the load is split between the two propellers
• Check the shaft splines, thrust faces and seal while the propeller is off, and inspect the other propeller too, since a strike on one usually shows in both
• Fit front and rear to the same type code - complete set 21916044.
• Line cutter 21913550 is the one listed for Volvo Penta IPS 15.

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21916044 - complete Type NS4 propeller set
• 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

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

📦 Condition

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