Volvo Penta Water Pump Impeller Kit PN 21700445 — V8 OEM 12-Blade 5/8" Spline (2-1/4" OD)

The Volvo Penta OEM Water Pump Impeller Kit (PN 21700445) is a direct-fit replacement impeller assembly designed to restore raw-water cooling performance on compatible V8 marine engines.

This genuine Volvo Penta impeller kit is manufactured to match original equipment dimensions and materials so your cooling system circulates seawater efficiently and reliably. It is intended as a replacement part for specific V8 sterndrive and inboard models, delivering the correct spline, blade count, and overall size for straightforward installation and dependable service life when maintained per manufacturer guidance.

Which engines and models does this impeller kit fit?

This kit is compatible with a range of Volvo Penta V8 engine variants commonly used in sterndrives and some inboard installations. Before ordering, verify your engine model and part number to ensure compatibility with PN 21700445.

• Fits many V8 350 and 380 series variants and selected V8 430 models
• Designed for engines listed under Volvo Penta fitment for impeller PN 21700445
• Check engine stamping or service manual to confirm exact match

What are the technical specifications and mounting details?

The impeller features a 5/8" spline drive and a dense 12-blade rubber design for consistent flow. Its outside diameter and width are manufactured to OEM tolerances so it seats correctly in the pump housing and mates to the stock shaft and drive.

• 5/8 inch spline drive, compatible with standard Volvo Penta pump shafts
• 12 flexible rubber blades for steady water flow and quieter operation
• 2-1/4 inch outside diameter with 1-7/8 inch face width to match OEM pump chambers
• Use Volvo impeller puller tool 3843948 for safe removal

How do I install and maintain this impeller for best performance?

Installation is straightforward for technicians familiar with marine cooling systems, but always follow Volvo Penta service instructions. Replace the impeller at regular intervals or at the first sign of blade wear, cracking, or deformation to avoid cooling failure.

• Inspect pump housing and shaft for wear before fitting a new impeller
• Lubricate the impeller hub slightly and rotate when seating to align blades
• Use the Volvo impeller puller 3843948 for removal to prevent damage
• Keep a spare impeller aboard as a routine preventative measure

Who is this for? Marine owners and technicians who operate or service Volvo Penta V8-powered boats and need an OEM-quality replacement impeller will find PN 21700445 useful. It suits boaters who prefer factory-spec parts to maintain cooling system integrity, avoid fitment issues, and ensure predictable service intervals. If your engine model is listed among the compatible V8 series, this kit restores correct pump geometry and helps protect your engine from overheating when used and maintained according to Volvo Penta instructions.