V-Belt – Fits Volvo Penta, Mercruiser, OMC 110-160HP (Replaces 966382, 57-64416, 912509)
V-Belt – Fits Volvo Penta, Mercruiser, OMC 110-160HP (Replaces 966382, 57-64416, 912509) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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V-Belt – Fits Volvo Penta, Mercruiser, OMC 110-160HP (Replaces 9663...
V-Belt – Fits Volvo Penta, Mercruiser, OMC 110-160HP (Replaces 966382, 57-64416, 912509) is backordered and will ship as soon as it is back in stock.
Product Details
This high-performance alternator V-Belt – Fits Volvo Penta, Mercruiser, OMC 110-160HP is designed for a wide range of marine engines from the late 1970s to the early 1990s. It fits Volvo Penta AQ series (120–171) and D series engines (D30–D41), Mercruiser 2.3L 140HP models, and OMC 888 2.3L engines.
This belt is a direct cross-reference for multiple OEM and aftermarket part numbers, including Volvo Penta 966382, Mercruiser 57-64416, OMC 912509, and Sierra 18-15435, ensuring broad compatibility.
- Engineered for use with 50 ampere AC-alternators.
- Installation requires manual tensioning for proper fit and performance.
- Designed to operate within a pulley drive system.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 841821 |
| Volvo Penta | 958314 |
| Volvo Penta | 958359 |
| Volvo Penta | 966382 |
| Volvo Penta | 966978 |
| Mercruiser | 57-44206 |
| Mercruiser | 57-49211 |
| Mercruiser | 57-64416 |
| OMC | 912509 |
| OMC | 0912509 |
| Sierra | 18-15435 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta engines, this belt is compatible with a wide range of AQ, D, MD, and TAMD/TMD series models produced from the late 1970s through the early 1990s.
For Mercruiser, it fits specific 2.3L 140HP models from 1987 to 1990.
For OMC, this belt is used on 888 2.3L engines manufactured between 1984 and 1990.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | AQ120 | 120 | 4-Stroke | Late 1970s–1980s | 841821 | |
| Volvo Penta | AQ125A, AQ125B | 125 | 4-Stroke | Late 1970s–1980s | 841821 | |
| Volvo Penta | AQ131A, AQ131B, AQ131C, AQ131D | 131 | 4-Stroke | Late 1970s–1980s | 841821 | |
| Volvo Penta | AQ145A, AQ145B | 145 | 4-Stroke | Late 1970s–1980s | 841821 | |
| Volvo Penta | AQ151A, AQ151B, AQ151C | 151 | 4-Stroke | Late 1970s–1980s | 841821 | |
| Volvo Penta | AQ171A, AQ171C | 171 | 4-Stroke | Late 1970s–1980s | 841821 | |
| Volvo Penta | D30, D31, AD31A, AD31D, AD31L-A, AD31P-A, AD31XD | 120–160 | 4-Stroke | Late 1970s–Early 1990s | 841821 | |
| Volvo Penta | MD22A, MD22LA | 110–130 | 4-Stroke | 1980s–1990s | 841821 | |
| Volvo Penta | TAMD30A, TMD30A, TAMD31A, TAMD31B, TAMD31D | 120–160 | 4-Stroke | Late 1970s–Early 1990s | 841821 | |
| Volvo Penta | D40, D41, AD40B, AD41A, AD41B, AD41D, AD41L-A, AD41P-A | 140–160 | 4-Stroke | Late 1970s–Early 1990s | 841821 | |
| Volvo Penta | TAMD41A, TAMD41B, TAMD41D, TAMD41H-A, TAMD41L-A, TAMD41M-A, TAMD41P-A | 140–160 | 4-Stroke | Late 1970s–Early 1990s | 841821 | |
| Mercruiser | 2.3L "4" 140 | 140 | 4-Stroke | 1987–1990 | 57-64416 | Also referenced as 57-49211, 57-44206 |
| OMC | 888 2.3L Engines | 110–160 | 4-Stroke | 1984–1990 | 912509 | Also referenced as 0912509 |
Technical Specs
- Product Type
- Alternator V-Belt
- Fitting Type
- V-Belt
- Dimensions
- 1100mm circumference (43 5/16")
- Weight
- 90g (0.2 lb)
- Belt Section
- AW-15
- Application
- For 50 ampere AC-alternator
- Connection
- Pulley drive system
- Housing Color
- Black
- Warranty
- 1-year against manufacturing defects
What’s in the Box
- 1 x V-Belt (Replaces 966382/841821/57-64416/912509)
Installation Notes
- Ensure the engine is turned off and cooled completely.
- Disconnect the battery to prevent accidental starting.
- Loosen the alternator pivot bolt and any tensioner bolts.
- Note the existing belt's path around all pulleys.
- Relieve tension by swiveling the alternator or tensioner, then remove the old belt.
- Inspect pulley grooves for wear or corrosion; clean if necessary.
- Route the new belt along the same path, ensuring it is properly seated in all V-grooves.
- Tension the new belt to approximately 1 cm (½") of deflection under thumb pressure at its longest span.
- Tighten all adjuster and pivot bolts to factory torque specifications.
- Reconnect the battery.
- Start the engine and check that the belt is running smoothly and centered in the pulleys.
- Re-check tension after a short run-in period, as new belts may stretch slightly.
Troubleshooting & FAQ
How do I know if this V-belt will fit my engine?
Check the Part Number Matrix and Engine Compatibility tables. It is crucial to match your engine model, year, and original part number to ensure a correct fit. This belt is designed for the specific Volvo Penta, Mercruiser, and OMC models listed.
What is the correct tension for this V-belt?
As a general rule, a properly tensioned V-belt should have about 1 cm (½ inch) of deflection when you press firmly on the longest span between pulleys. Over-tightening can damage bearings, while a loose belt will slip, squeal, and wear out prematurely.
How often should I replace my alternator belt?
We recommend inspecting your V-belt annually for cracks, fraying, or glazing. To prevent unexpected failure, you should plan to replace it every 3–5 years or according to your engine manufacturer's service schedule, whichever comes first.
What are the signs of a failing V-belt?
Common symptoms include a high-pitched squealing noise (especially on startup or under load), visible cracks or fraying, a polished or glazed appearance on the belt's sides, or alternator charging issues indicated by a battery warning light.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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