Sierra 18-15460 Cogged V-Belt — Marine Inboard & Sterndrive Accessory Drive
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Sierra 18-15460 Cogged V-Belt — Marine Inboard & Sterndrive Accessory Drive
Part Number: 18-15460 | SKU: 47-15460
Brand: Sierra
System: Accessory Drive / Raw-Water Pump, Alternator & Power-Steering Belt
Supplied as: One (1) replacement belt
The Sierra 18-15460 is a precision-moulded cogged marine V-belt engineered to replace OEM belts on MerCruiser, OMC sterndrive, and Volvo Penta accessory-drive systems. High-strength synthetic tension cords resist stretching and shock loading across the full service life, while the open cog profile reduces operating temperature and improves flex around smaller-diameter drive pulleys. Rubber edge sidewalls maintain firm contact with pulley grooves — so your alternator keeps charging and your raw-water pump keeps cooling, every time you leave the dock.
Specifications
- Effective length: 46 inches / 116.8 cm
- Top width: 29/64 inch / 11.5 mm
- Profile: Cogged V-belt
- Construction: High-strength synthetic tension cords, compression rubber, rubber-edge sidewalls
- Weight: ~118 g (0.26 lb)
- UPC: 030999566577
Key Features
- Open cog profile improves flexibility and reduces heat buildup during extended running
- Low-stretch synthetic cords maintain consistent drive tension between service intervals
- Rubber edge construction maintains positive contact with pulley groove sidewalls
- Drop-in OEM replacement — no modifications required
- Suitable as an onboard spare for extended offshore or coastal cruising
Compatible Applications
- MerCruiser sterndrive models specifying OEM belt numbers 57-48120, 57-48120A1, or 57-48120Q1
- OMC sterndrive models specifying OEM belt numbers 310953, 0310953, 909971, or 0909971
- Volvo Penta inboard and sterndrive models specifying OEM belt numbers 829207, 950818, or 966920
- Accessory-drive positions including alternator, raw-water circulation pump, and power-steering pump depending on engine and pulley configuration
Serial Number Fitment Notice
Confirm the engine model, serial-number range, original OEM belt number, and accessory-drive arrangement before ordering. Engines within the same family can use different belt lengths and widths depending on the alternator specification, power-steering option, pulley layout, and production year. Sierra offers many visually similar marine V-belts in small increments — a nearby part number such as 18-15455, 18-15470, or 18-15480 is not automatically interchangeable with this belt.
Supersedes / Cross-Reference
- Sierra: 18-15460
- Mallory: 9-55002
- AP: 1540
- MerCruiser: 57-48120, 57-48120A1, 57-48120Q1
- OMC: 310953, 0310953, 909971, 0909971
- Volvo Penta: 829207, 950818, 966920
Service Interval
Inspect at every 100-hour service or annually, whichever comes first. Replace immediately if you find cracking between the cogs, frayed edges, glazing, hardening, missing cog material, oil or coolant contamination, or excessive stretching. Belt slipping under load, squealing, repeated loss of tension, or a belt riding low in the pulley groove are signs of wear, misalignment, or an incorrect belt profile — do not delay replacement.
Installation Notes
- Inspect all accessory pulleys for wear, corrosion, contamination, and misalignment before installing the new belt
- Check pulley alignment and confirm correct belt routing
- Inspect tensioner or adjustment hardware and replace if worn
- Do not force the belt over pulley flanges with sharp tools — this can damage the internal tensile cords
- Set tension to the engine manufacturer’s specification
- Rotate the drive by hand to confirm correct seating, then recheck tension after the first operating period
Related Parts
- Other sizes in this series:
- Cooling system service (pair with this belt):
Technical FAQ
Q: How do I confirm this is the correct belt for my engine?
A: Cross-reference your existing OEM belt number with the supersedes list above. If your engine specifies any of the MerCruiser 57-48120 series, OMC 310953/909971, or Volvo Penta 829207/950818/966920, this is the direct replacement. If your number is not listed, check the other sizes in the series above or contact us with your engine model and serial number.
Q: Why can’t I just match by approximate length?
A: A belt of approximately the correct length can still be wrong for your pulley system — the top width, cog profile, and tension-cord spacing all affect how the belt seats and transfers load. Always match the OEM part number.
Q: Can a single belt drive both the alternator and raw-water pump?
A: Yes, on many MerCruiser, OMC, and Volvo Penta configurations a single accessory-drive belt drives multiple components. Confirm your specific pulley layout against the engine service manual before ordering.
Q: Should I replace this belt during a raw-water pump impeller service?
A: If the pump is accessible during impeller replacement, replacing the drive belt at the same time is good practice — especially if it has not been changed in the last two seasons.
Parts Desk Insights
Best use case: This is the pre-season replacement belt for MerCruiser, OMC sterndrive, and Volvo Penta owners whose engines specify the OEM numbers listed above. The 46-inch effective length and 29/64-inch top width are the critical dimensions — if both match your existing belt and your OEM number is in the cross-reference list, this is your part. It also makes a practical onboard spare for extended cruising; a belt failure on an inboard can simultaneously knock out raw-water cooling and battery charging.
Common customer issues: The most frequent problem is customers ordering by approximate length without confirming the OEM number — a nearby size is not always the right profile or width for the pulley grooves. Always ask the customer to confirm the OEM belt number and engine serial range before dispatching. Note that the 18-15460 covers three distinct OEM families (MerCruiser, OMC, and Volvo Penta), so confirming the engine make is the first step. Customers doing a cooling system service should also be offered the PCM Impeller Kit RP061017 or PCM / Crusader RP061022 Impeller depending on their pump model.
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
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.