Sierra Marine Power Steering V-Belt 18-15450 | 45 in. / 114.3 cm × 29/64 in. / 11.5 mm
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Sierra Marine Power Steering V-Belt 18-15450 — 45 in. / 114.3 cm × 29/64 in. / 11.5 mm
The Sierra 18-15450 is a cogged marine V-belt for the power-steering accessory drive on select OMC Sterndrive / Cobra and Volvo Penta inboard and sterndrive applications. With an effective length of 45 in. / 114.3 cm and a top width of 29/64 in. / 11.5 mm, it replaces OEM belts 914787 (OMC) and 3858462 (OMC / Volvo Penta). Built with high-strength synthetic cords, precision-moulded cogs, and rubber sidewalls for positive pulley grip and stable power transfer across the power-steering pump drive.
Part Information
- Part Number (Sierra): 18-15450
- SKU: 47-15450
- Brand: Sierra
- Official Product Type: Cogged Marine V-Belt
- UPC: 030999566553
- System: Power Steering Accessory Drive
- Effective Length: 45 in. / 114.3 cm
- Top Width: 29/64 in. / 11.5 mm
Cross-Reference Part Numbers
- OMC: 914787 (superseded by 3858462)
- OMC / Volvo Penta: 3858462
- Volvo Penta: 960336, 3853331
Compatible Applications
- OMC Sterndrive / Cobra — select 5.0 L and 5.8 L models, early 1990s, power-steering pump belt position
- Volvo Penta inboard and sterndrive applications specifying OEM belt 3858462, 960336, or 3853331
- Any OMC or Volvo Penta application cross-referencing OEM belt number 914787
Fitment Note: Before ordering, confirm your engine make, model, serial number, existing OEM belt number, power-steering pump configuration, and required belt length and width. Several visually similar belts were used across OMC and Volvo Penta power-steering systems — belt length alone is not sufficient for a correct match. Always verify pulley arrangement and OEM part number.
Service Interval
- Inspect at every spring commissioning and 100-hour service
- Replace when cracks appear between cogs, edges fray, belt glazes or hardens, or power-steering squeal develops
- Replace immediately if oil or coolant contamination is present on the belt or if tension can no longer be maintained within specification
- A spare belt onboard is recommended for extended passages — a belt failure can simultaneously disable power steering, raw water cooling, and battery charging depending on drive configuration
Technical Notes
- Inspect all pulley grooves for wear, corrosion, and contamination before installation
- Confirm correct belt routing and power-steering pump alignment
- Check adjustment hardware condition before tensioning
- Set tension to engine manufacturer’s specification — do not over-tension
- Do not force the belt over pulley flanges with sharp tools
- Rotate the drive through one full revolution after installation to confirm proper seating; recheck tension after initial operation where specified
- A belt riding unusually low in the groove indicates an incorrect belt profile — verify part number before re-use
Parts Desk Insights
Best Use: The 18-15450 is the go-to power-steering belt for pre-season service on early-1990s OMC Cobra and compatible Volvo Penta sterndrives. If your engine specifies OEM belt 914787 or 3858462, this is the correct replacement. It is also a practical onboard spare — belt failure on these drives can take out steering assist, raw water cooling, and charging simultaneously.
Common Issues: The most frequent ordering error is selecting by belt length alone without verifying the OEM part number. Several belts of similar length were used across OMC and Volvo Penta power-steering and alternator positions — always cross-reference against 914787 or 3858462 to confirm the correct belt before installation.
Related Parts
- Sierra Marine V-Belt 18-15440 — 44 in. / 111.8 cm — shorter belt in the same cogged series
- Sierra V-Belt 47-15455 — 44.5 in. — intermediate size
- Sierra Marine V-Belt 18-15470 — 47 in. / 119.4 cm — next size up in the same series
- Sierra Marine V-Belt 18-15480 — 48 in. / 121.9 cm — 48-inch variant
- Sierra Marine Power Steering V-Belt 18-15520 — 52 in. / 132.1 cm — longer power-steering belt in the same family
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.