Mercury MerCruiser Sea Pump Pulley 8M0141645
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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.
Key Specifications
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Part Number: 8M0141645
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Component Type: Sea water pump pulley
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Pulley Diameter: approx. 7-1/2 in
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OEM Brand: Mercury Marine / Quicksilver
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UPC: 745061842311
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:
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High-horsepower sterndrive installations
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Cruisers and performance boats
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Engines paired with Bravo sterndrives
Function
The sea pump pulley is part of the engine cooling drive system and works by:
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Allowing the serpentine belt to drive the seawater pump
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Rotating the pump to pull raw water from outside the boat
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Circulating cooling water through the engine block or heat exchanger
If the pulley becomes damaged, bent, or misaligned it can cause:
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Belt squeal or belt wear
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Poor seawater pump performance
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Engine overheating due to reduced water flow.
⚠️ 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.
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
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.