SOXAMARINE Impeller Repair Kit for Volvo Penta 3.0–8.1L Inboard Engines — 21951348 Fit, Impeller+O‑ring+Stop Lug

SOXAMARINE's 21951348 impeller repair kit replaces worn raw-water pump parts on Volvo Penta 3.0–8.1L inboard engines to restore cooling flow and sealing. This compact repair kit contains the impeller, an O-ring, and a stop lug engineered to fit crankshaft-mounted pumps used on many Volvo Penta engines from the late 1990s through the mid-2000s. The parts are sized to match original equipment dimensions so you can swap components quickly during routine maintenance or emergency field repairs. It’s a direct-fit aftermarket alternative to several Volvo OEM numbers, made to help reestablish reliable sea-water circulation through the engine cooling system.

Which Volvo Penta engines and pump types does this kit fit?

The kit is intended for inboard Volvo Penta engines with raw-water pumps mounted directly to the crankshaft, commonly found on 3.0 to 8.1 liter models from around 1999–2005. It replaces a long list of OEM numbers, enabling compatibility across multiple model lines and repower builds. Always cross-check your pump housing and shaft size before ordering.

• Fits Volvo Penta 3.0–8.1 L inboard engines with crankshaft-mounted pumps
• Replaces OEM references such as 806590, 3862567, 21951348, 3857954 and others
• Designed for pumps used in late‑1990s to mid‑2000s Volvo installations

What are the exact part dimensions and included components?

The impeller and sealing parts match the original geometry so installation requires minimal adjustments. Impeller width, outer diameter and shaft bore match common Volvo specifications for these pumps to maintain correct clearances and flow rates. The stop lug is supplied as the correct replacement for the listed part number to prevent rotor rotation issues.

• Impeller width: 1-1/4" (31.5 mm)
• Impeller diameter: 2-1/4" (57 mm)
• Shaft bore: 5/8" (16 mm)
• Kit contents: 1 impeller, 1 O‑ring, 1 stop lug (replaces part 3857954)

How do I install this kit and what should I check during replacement?

Installation is straightforward for anyone familiar with raw-water pump servicing: drain cooling system as needed, remove pump cover, replace the impeller, fit the new O‑ring and secure the stop lug per the pump’s orientation. Inspect the housing and wear plate for scoring or corrosion and measure clearance to ensure efficient operation. Torque fasteners to manufacturer specs and test for leaks before returning the vessel to service.

• Drain raw-water path and remove pump cover carefully
• Replace impeller, O‑ring, and install stop lug in correct orientation
• Check pump housing, wear plate, and impeller clearance
• Run engine briefly and inspect for leaks and proper flow

Why choose this aftermarket kit instead of a new pump or OEM parts?

This SOXAMARINE repair kit offers a cost-effective way to restore pump function without the expense of a full assembly replacement. It supplies the exact wear items most likely to fail—rubber vanes, seal ring, and locating lug—so you can get back on the water quickly. For boats where the pump body is serviceable, this kit reduces downtime and parts cost while matching OEM fitment numbers for compatibility.

• Lower cost than a complete pump replacement
• Includes the critical wear parts that typically fail first
• Direct-fit dimensions and cross-references to Volvo OEM part numbers

Who is this for? This repair kit is aimed at boat owners, mechanics, and marine technicians maintaining Volvo Penta 3.0–8.1L inboard engines, especially those with crankshaft-mounted raw-water pumps from around 1999–2005. Choose this kit if your pump housing is in good condition but the impeller, O‑ring, or stop lug show wear, or if you need a quick, reliable aftermarket replacement that matches OEM specifications. For extensive housing damage or repeated failures, consider a full pump overhaul or professional diagnosis.

FAQ

Q: Does this kit fit Volvo Penta 5.7L engines?

A: Yes — it fits many crankshaft-mounted pumps on Volvo Penta 3.0–8.1L engines, including some 5.7L models. Verify pump shaft size and housing before ordering.

Q: What exactly is included in the kit?

A: The kit contains one impeller, one O‑ring, and one stop lug (replacement for part 3857954).