Description

Mercury / MerCruiser Quicksilver Sea Pump Pulley — 8M0141645

The Mercury Quicksilver 8M0141645 is a genuine OEM sea water pump pulley used on certain MerCruiser sterndrive and inboard engines. The pulley mounts to the engine-driven seawater pump and is driven by the accessory belt to circulate raw water through the engine cooling system.

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Key Specifications

• Part Number: 8M0141645

• Component Type: Sea water pump pulley

• Pulley Diameter: approx. 7-1/2 in

• OEM Brand: Mercury Marine / Quicksilver

• UPC: 745061842311

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Compatible Engines

This pulley is commonly associated with MerCruiser 8.2L MAG engines, particularly base models using an engine-driven seawater pump.

These engines typically appear in:

• High-horsepower sterndrive installations

• Cruisers and performance boats

• Engines paired with Bravo sterndrives

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Function

The sea pump pulley is part of the engine cooling drive system and works by:

• Allowing the serpentine belt to drive the seawater pump

• Rotating the pump to pull raw water from outside the boat

• Circulating cooling water through the engine block or heat exchanger

If the pulley becomes damaged, bent, or misaligned it can cause:

• Belt squeal or belt wear

• Poor seawater pump performance

• Engine overheating due to reduced water flow.

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Fitment Tip:
Always verify compatibility using the engine model and serial number. MerCruiser engines often use different pulley diameters depending on cooling configuration (standard vs closed cooling) and belt routing.

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If you want, I can also build you a MerCruiser cooling system parts map (sea pump, circulation pump, pulleys, brackets, belts).
It’s extremely useful for parts counter troubleshooting because customers often confuse the circulation pump pulley vs the seawater pump pulley.

Shipping:

OEM parts ship same or next day for fast Canada wide shipping.

Technical Specifications:

• Type: Sea pump (raw water pump) drive pulley
• Compatible with: Mercury MerCruiser marine engines
• Part Number: 8M0141645