YRANZO Sea Water Pump for Volvo Penta 4.3/5.0/5.7 Crankshaft-Mounted Replacement with Serpentine Pulley

YRANZO sea water pump is a crankshaft-mounted replacement designed to fit Volvo Penta 4.3L, 5.0L and 5.7L marine engines, swapping in for part numbers 21212799 and 3812519.

This replacement raw water pump is built to restore seawater cooling circulation on compatible Volvo Penta gasoline engines. The assembly includes the pump housing and a serpentine-belt pulley, matching the crankshaft-mounted layout used on many V6 and V8 marine powerheads. It’s sold as a direct-replacement component that helps return your boat to reliable cooling performance when the original pump shows wear, leaks, or reduced flow.

How does this pump match my Volvo Penta engine?

The YRANZO pump is manufactured to fit the crankshaft-mounted raw water design used on several Volvo Penta gasoline engines. It is intended as a direct swap for the common service part numbers listed by OEMs.

• Compatible with Volvo Penta 4.3L, 5.0L and 5.7L gasoline engines (V6 and V8 layouts).
• Replaces OEM part numbers 21212799 and 3812519 for like-for-like fit.
• Includes the serpentine belt pulley configured for crankshaft mounting.
• Check your original part number and pump orientation before ordering to ensure correct match.

What comes in the package and what should I expect?

The product ships as a single raw water pump assembly with pulley, ready to be installed by a mechanic. No installation manual is included, so be prepared to follow service documentation or professional guidance.

• One raw water pump with serpentine belt pulley as pictured.
• Packaging geared for aftermarket replacement, not a full gasket or hose kit.
• No installation instructions; professional installation recommended for correct sealing and alignment.
• Inspect inlet/outlet ports and pulley alignment prior to installation to prevent leaks or belt issues.

How do I know when to replace the sea water pump?

Signs of a failing raw water pump include reduced cooling flow, visible leaks, noisy operation, or a worn impeller (if applicable). Regular seasonal inspection prevents overheating-related damage to the engine cooling circuit.

• Reduced or no coolant flow at the exhaust indicates impaired pumping.
• Visible saltwater leakage at the pump housing or shaft seal suggests replacement is needed.
• Unusual vibration or squeal from the pulley area can mean bearing wear or misalignment.
• Follow engine-maker recommended inspection intervals, especially before launch season.

Who is this for: Boaters, marine mechanics and service shops looking for a reliable aftermarket raw water pump replacement for Volvo Penta 4.3, 5.0 and 5.7 gasoline engines. This YRANZO unit suits owners who need a crankshaft-mounted pump that replaces OEM part numbers 21212799 and 3812519, and who have access to service instructions or a technician for proper installation. If you need a complete overhaul kit (gaskets, impeller, seals), verify your parts list and consider sourcing additional consumables prior to service.

Installation note: This pump is provided without an installation manual; professional installation is recommended to ensure correct shaft alignment, sealing, and belt tension for dependable operation.

• Fits: Volvo Penta 4.3L, 5.0L, 5.7L raw water engines.
• Replaces Part Numbers: 21212799, 3812519.
• Package includes: Raw water pump assembly with serpentine belt pulley.
• Installation: No instructions included; professional installation recommended.
• Tip: Verify your existing part number to confirm compatibility before purchase.