Mercury MerCruiser Quicksilver — Serpentine Belt — 8M0045986
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Mercury MerCruiser Quicksilver Serpentine Belt 8M0045986
The Mercury MerCruiser Quicksilver 8M0045986 is a genuine OEM serpentine accessory-drive belt for select Mercury MerCruiser MIE 8.2L inboard engines. The 2287 mm belt drives the engine's belt-driven accessories and is identified by Mercury with the full service number 57-8M0045986.
Compatible Applications
- MerCruiser 8.2L Inboard Base EC
- MerCruiser 8.2L Inboard H.O. EC
- Mercury MerCruiser MIE 8.2L and 8.2L H.O. EC inboard engines, generally 2010 and newer
- 8.2L, 502 cu. in. V8 GM engine family applications beginning with serial range 1A350802 and up
Confirm the engine serial number and propulsion configuration before ordering. Mercury identifies this belt for MIE inboard applications, not every 8.2L engine.
Part Details
- Brand: Mercury MerCruiser Quicksilver
- OEM part number: 8M0045986
- Full Mercury service number: 57-8M0045986
- Product type: Serpentine accessory-drive belt
- System: Engine accessory drive, including alternator and water-pump drive
- Length: 2287 mm, 90.04 in., approximately 7.50 ft
- Quantity required: One belt per applicable engine
- Supersedes: No verified superseded OEM number
- Replaced by: No verified later replacement
Key Features
- Genuine Mercury Quicksilver OEM serpentine belt
- Specified for select 8.2L MIE inboard and 8.2L H.O. EC applications
- 2287 mm length for the identified accessory-drive configuration
- Designed to maintain proper pulley engagement and accessory drive operation
Important MIE and MCM Fitment Difference
8M0045986 is the MIE inboard belt. Mercury diagrams may also show 8M0045227, which is the corresponding belt for MCM sterndrive applications. Do not treat these belts as interchangeable based only on an 8.2L engine, displacement, or belt length. Verify the propulsion configuration and engine serial number first.
When Replacement May Be Needed
Inspect the belt for cracking across the ribs, frayed edges, missing or deteriorated rib sections, glazing, stretching, loss of tension, squealing, slipping, or contamination from oil or coolant. A deteriorated belt can affect belt-driven engine components and should be addressed before failure.
Installation Notes
Photograph or record the belt-routing pattern before removal. Inspect the tensioner, idler pulleys, accessory pulleys, and pulley alignment while the belt is off. Route the replacement fully into every pulley groove, confirm proper tension, and verify that the belt tracks evenly before operating the engine.
Technical FAQ
What does MIE mean in this application?
MIE identifies the Mercury MerCruiser inboard configuration. This part number is not a generic belt for every 8.2L engine.
What is the difference between 8M0045986 and 8M0045227?
8M0045986 is identified for MIE inboard engines, while 8M0045227 is identified for corresponding MCM sterndrive applications.
Can belt length alone confirm fitment?
No. Confirm the engine model, serial number, and propulsion configuration because similar 8.2L platforms can use different belts.
View the MerCruiser 8.2L Inboard Base EC water pump and front cover schematic.
Parts Desk Insights
Best use: Use this belt when the engine documentation identifies Mercury 8M0045986 for an 8.2L MIE inboard or 8.2L H.O. EC application.
Common mistake: Choosing the belt from the engine displacement alone can lead to the MCM sterndrive belt being selected for an MIE inboard engine. The two configurations use different part numbers.
Fitment guidance: If you are replacing a belt on an 8.2L engine, verify the serial number, propulsion configuration, routing pattern, and full service number 57-8M0045986 before ordering.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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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.
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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.
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