Volvo Penta 3593573 Impeller Kit Raw Water Pump

Volvo Penta 3593573 Impeller Kit, Raw Water Pump

Part Number: 3593573
Brand: Volvo Penta
Official Part Type: Impeller Kit Raw Water Pump
System: Raw Water Cooling Circuit
Diagram Position: Impeller assembly within the raw water pump housing

What This Kit Includes

• Flexible rubber impeller (3593573)
• O-ring and/or gasket as required for the pump cover

What This Part Does

The raw water pump impeller is the heart of your engines cooling circuit. Its flexible rubber vanes draw seawater or raw water through the pump and push it through the heat exchanger and cooling system. When the impeller wears, cracks, or loses flexibility, water flow drops and the engine overheats. This OEM kit replaces the impeller and sealing components to restore full pump output.

Compatible Applications

• Volvo Penta D4 raw water pump (confirm by serial number)
• Volvo Penta D6 raw water pump (confirm by serial number)
• Volvo Penta TAMD series select applications (verify by serial number)
• Volvo Penta KAD series select applications (verify by serial number)

Serial Number Notice: Fitment depends on engine model, raw water pump type, and production range. Always confirm part number 3593573 against your engine serial number and the correct Volvo Penta raw water pump diagram before ordering.

Cross-References

• Sierra 18-3057 (aftermarket verify fitment before ordering)
• Johnson Pump 09-812B-1 (aftermarket verify application before ordering)

Dimensions & Weight

Approximate kit weight: 0.3 kg. Impeller dimensions should be verified against the Volvo Penta raw water pump schematic for your specific engine serial number.

Service Interval

Volvo Penta recommends inspecting and replacing the raw water pump impeller every 100 hours or annually, whichever comes first. In saltwater or high-use applications, more frequent inspection is advisable.

When to Replace

• Reduced or no raw water flow from the exhaust
• Engine running hotter than normal or overheating
• Cracked, missing, or hard/brittle impeller vanes found during inspection
• At the recommended 100-hour or annual service interval
• Any time the raw water pump is opened for other service

Installation Notes

• Lubricate the impeller with dish soap or a water-based lubricant before installation do not use petroleum-based grease
• Install with the correct vane rotation direction (refer to the Volvo Penta pump diagram)
• Replace the O-ring and gasket included in the kit
• Inspect the pump housing bore and wear plate for scoring before reassembly
• After removing the old impeller, check the cooling circuit for broken vane debris and flush if any pieces are missing

Technical FAQ

Do I need to check for broken vane pieces after replacing the impeller?
Yes. If the old impeller had cracked or missing vanes, those pieces can travel downstream into the heat exchanger or thermostat housing. Always account for all vane pieces and flush the circuit if any are missing.

How do I confirm this kit fits my engine?
Use your engine serial number to locate the correct Volvo Penta raw water pump diagram and confirm that 3593573 is listed for your specific pump assembly and engine build.

Can I use an aftermarket impeller instead?
Aftermarket cross-references like Sierra 18-3057 and Johnson Pump 09-812B-1 may fit, but always verify the application against your pump assembly before ordering. OEM kits are manufactured to Volvo Pentas exact tolerances.

Parts Desk Insights

The impeller is one of the most important maintenance items on a raw-water-cooled engine, and one of the most commonly skipped. The most frequent issue we see is customers who replace the impeller after an overheating event at that point, the pump housing may already be scored and the heat exchanger may have debris in it. Replacing on schedule (every 100 hours or annually) is far less expensive than dealing with the downstream damage from a failed impeller. When you pull the old one, always count the vanes if any are missing, find them before you button everything back up.