21661904 Propeller | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Type IH4 Front Aluminium Duoprop Propeller - Part Number: 21661904

A three-blade left-hand-rotation front propeller from the Volvo Penta Type IH4 aluminium Duoprop system for DPS-B drives with helical propeller-shaft splines.

⚙️ Key Features

• Propeller size: IH4

• Front propeller position

• Three-blade left-hand rotation

• High-strength squeeze-cast aluminium

• Four-layer corrosion-resistant paint system

• Matched to the corresponding four-blade rear propeller

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• Current OEM reference: 21661904

• Type IH replaces the earlier straight-spline Type I arrangement on DPS-B helical-spline drives

OEM / Related Numbers:

• 21661904

• 21661944 - Complete Type IH4 front and rear propeller set

• 21661924 - Matching Type IH4 rear propeller

• 21631162 - Rear propeller nut

• 3851569 - Front propeller nut

• 3855516 - Duoprop tool kit

Aftermarket / Verified Equivalents:

• No direct aftermarket equivalent

🚤 Compatibility

• DPS-B sterndrive with helical propeller-shaft splines

• D3-140A-E / D3-140A-F / D3-140A-H

• D3-170A-E / D3-170A-F

• D3-170I-F

• D3-200A-E / D3-200A-F

• D3-200I-F

• D3-220A-E / D3-220A-F

• D3-220I-F

• 4.3Gi-Q / 4.3GXi-Q / 4.3GXiE-Q / 4.3GXIE-225-R

• Approved for D3 diesel and 4.3L petrol installations below approximately 38 knots / 45mph

• Do not mix Type I and Type IH propellers on the same drive

• Twin-engine installations must use the same type and size on both drives

• Use the specified Type FH stainless-steel family for higher-speed applications

🔌 Function

The front propeller works with the matched rear propeller to produce counter-rotating thrust, reduced steering torque, strong acceleration and efficient planing.

Common signs of failure or damage:

• Bent, chipped or cracked blades

• Cavitation erosion

• Vibration under load

• Reduced acceleration or top speed

• Hub or spline damage

• Mismatched front and rear propellers

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging