21258489 Propeller Kit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Type I9 Aluminium Duoprop Propeller Kit - Part Number: 21258489

A genuine Volvo Penta matched Type I9 aluminium Duoprop set for DPS and DPS-A sterndrives with straight propeller-shaft splines.

The set contains the three-blade front propeller and four-blade rear propeller engineered to operate together. The I9 designation is a Volvo performance size, not a simple diameter or pitch measurement.

⚙️ Key Features

• Genuine Volvo Penta OEM Type I9 Duoprop set

• Correct complete-set part number 21258489

• High-strength aluminium alloy with protected marine coating

• Three-blade front propeller and four-blade rear propeller

• For DPS and DPS-A straight-spline drives only

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 21258489 current Volvo Penta Type I9 matched propeller-set reference

• 21324319 earlier rear-propeller reference where shown in older Volvo propeller guides; current rear reference is 21657169

OEM / Related Numbers:

• 21258489

• 21260649 front propeller

• 21657169 rear propeller

• 21324319 earlier rear reference where applicable

• 21631162 rear propeller nut included in Type I sets according to the Volvo propeller guide

• 3851569 separate front propeller nut

Kit Contents:

• Front three-blade Type I9 propeller - part number 21260649 - quantity 1

• Rear four-blade Type I9 propeller - part number 21657169 - quantity 1

• Rear propeller nut - part number 21631162 - quantity 1

• Front propeller nut 3851569 and other installation hardware are separate unless specifically included by the supplier

Aftermarket / Verified Equivalents:

• No direct aftermarket equivalent verified

🚤 Compatibility

Commonly used on:

• Volvo Penta DPS and DPS-A Aquamatic sterndrives with straight splines

• Replacement of an existing matched Type I set of the same size

• Upgrade from an older Type D set after dealer propeller sizing

Typically suits:

• Engine / Drive models:

• DPS

• DPS-A

• DPS-A OXi with straight propeller splines where Type I is approved

• Important Fitment Notes:

• Do not fit to DPS-B or other helical/spiral-spline drives; those use Type IH.

• Do not mix Type D and Type I propellers, or different Type I sizes.

• Volvo recommends Type F/FH stainless propellers for six-cylinder diesels, engines above 240HP or boats capable of more than 38 knots.

• Final size selection depends on engine output, gear ratio, hull weight and achieved wide-open-throttle RPM.

• HP Range: Normally used within the Type I aluminium application range; Volvo recommends stainless Type F/FH above 240HP

• Engine / Drive Type: Volvo Penta DPS/DPS-A counter-rotating sterndrive propulsion

• Year Range: Approximately late 2000s onward as the Type I replacement for Type D sets

🔌 Function

The counter-rotating front and rear propellers convert drive torque into balanced thrust. Their matched blade geometry improves acceleration, tracking, grip and low-speed manoeuvrability while cancelling most propeller-side force.

Common signs of failure or incorrect fitment:

• Bent, cracked or heavily eroded blades

• Hub slip or rubber-bushing damage

• Vibration following impact

• Engine cannot reach specified full-throttle RPM

• Mixed front/rear sizes or incorrect spline type installed

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging