Lisnhlin Inboard Impeller Repair Kit for Volvo Penta 3.0–8.1 — Stop Lug & O-ring Seals, Direct-Fit (1999–2005)

This repair kit provides the critical parts needed to restore cooling-pump function on Volvo Penta inboard engines (pump mounted on the crankshaft) from model years 1999–2005. It replaces multiple OEM numbers and includes precision components to fit a broad range of Volvo Penta 3.0, 4.3, 5.0, 5.7 and 8.1 engines. Whether you're preparing a boat for the season or performing routine maintenance, this kit is sized and specified to return the impeller assembly to dependable service.

How does this kit match my Volvo Penta engine?

The Lisnhlin kit is built specifically for Volvo Penta inboard configurations where the water pump is mounted directly on the crankshaft, covering popular engine displacements from 3.0 through 8.1. It replaces many OEM part numbers so you can confirm fit by cross-referencing your existing parts or manual.

• Compatible with Volvo Penta models 3.0, 4.3, 5.0, 5.7 and 8.1 (pump on crankshaft).
• Covers engines commonly produced from 1999 to 2005 for direct-fit replacement.
• Replaces multiple part numbers including 21213660, 21951348, 3857954 and others.

What components are included and why do they matter?

The kit contains the impeller stop lug plus the correct O-ring seals and related hardware needed to rebuild the pump sealing and rotation stop function. Worn lugs or brittle seals are common causes of reduced cooling performance; this kit addresses those failure points directly.

• Stop lug to secure the impeller and prevent slip under load.
• O-ring seals sized for a tight watertight pump assembly.
• Additional hardware where required to restore original fit and alignment.

How difficult is installation for DIYers and mechanics?

Installation is straightforward for anyone familiar with inboard cooling pumps and basic marine repair tools; the kit is supplied with the components required to return the assembly to service. Less experienced users should follow the engine service manual or consult a marine mechanic to ensure correct torque and seal seating.

• Designed for easy, direct replacement without custom modifications.
• No special tools beyond common marine hand tools and seal lubricant.
• Follow torque specs and alignment steps in the Volvo Penta service instructions for a reliable seal.

What performance improvements should I expect after replacing parts?

Replacing a degraded impeller stop lug and old O-rings restores proper pump function and helps maintain consistent coolant flow. This reduces the risk of overheating due to slippage or seal leaks and improves the overall reliability of the cooling system while underway.

• Restores correct impeller engagement and rotation stability.
• Re-establishes proper sealing to prevent leaks and cavitation.
• Helps maintain designed coolant flow and engine temperature control.

Who is this for: The Lisnhlin 21951348 impeller repair kit is intended for boat owners, marine technicians and fleet managers who operate Volvo Penta inboard engines with crankshaft-mounted pumps from the late 1990s to mid-2000s. It suits DIYers doing routine pump maintenance, yards prepping vessels for the season, and professional mechanics needing a direct-fit replacement kit that matches multiple OEM part numbers.