Sierra — Power Steering V-Belt 45 in. (114.3 cm) x 29/64 in. (11.5 mm) — 18-15450
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Sierra Marine Power Steering V-Belt 18-15450 — 45 in. (114.3 cm) x 29/64 in. (11.5 mm)
The Sierra 18-15450 is a cogged marine V-belt used mainly for power-steering pump drive applications on selected OMC Sterndrive and Volvo Penta gasoline engines. Its cogged construction improves flexibility and airflow, while high-strength synthetic cords and rubber belt edges resist shock loading and keep positive contact with the pulley grooves for consistent steering-pump drive.
Compatible Applications
- OMC 5.0L sterndrives — selected early-1990s power-steering pump assemblies
- OMC 5.8L sterndrives — selected early-1990s power-steering pump assemblies
- Volvo Penta 3.0L, 5.0L and 5.8L gasoline engines specifying OEM belt 3858462, 960336 or 3853331
- Any OMC or Volvo Penta application cross-referencing OEM belt number 914787
On verified OMC power-steering diagrams, 914787 is identified as the power-steering pump belt, later superseded by 3858462, with Sierra 18-15450 listed as the aftermarket replacement. Exact belt use varies by accessory configuration.
Serial Number Fitment Notice
Do not select this belt from engine displacement alone. Accessory-drive arrangements can differ by engine model, year, serial number, pulley configuration, and whether the engine is equipped with power steering. Confirm that the original belt or parts diagram calls for 18-15450, 914787, 3858462, or another verified interchange before ordering.
When This Part Needs Replacement
- Cracking between the cogs or along the belt edges
- Glazing or a polished belt surface
- Fraying or damaged cord material
- Excessive belt stretch
- Belt squeal or slipping under steering load
- Difficulty maintaining the specified belt tension
- Oil, coolant or other contamination that has softened the belt
A slipping power-steering belt can reduce pump speed and may cause heavier or inconsistent steering effort.
Installation Notes
Check the condition and alignment of the crankshaft and power-steering pump pulleys before installing the replacement belt — pulley corrosion, damaged grooves, or misalignment can shorten belt life even when the correct belt is installed. Set belt tension using the applicable engine service procedure rather than overtightening, since excessive tension places unnecessary load on pump and accessory bearings. After installation, verify that the belt tracks correctly in every pulley groove and recheck tension after initial operation if required by the engine service procedure.
Alternate/Cross-Reference Part Numbers
- OMC 914787 (superseded by 3858462)
- OMC / Volvo Penta 3858462
- Volvo Penta 960336
- Volvo Penta 3853331
Technical FAQ
Is this the same belt as a standard alternator/water-pump belt? No — 18-15450 is specified at the power-steering pump position on the applications listed above. If you are replacing a different accessory belt on the same engine, verify that position's OEM number separately.
Does 914787 or 3858462 confirm the right belt for my engine? Both are verified cross-references for 18-15450, but confirm against your engine's serial number and parts diagram since similar-length belts were used in other accessory positions.
Parts Desk Insights
Best use case: This belt is best suited to power-steering pump service on the OMC 5.0L/5.8L sterndrives and compatible Volvo Penta gasoline engines listed above, where 914787 or 3858462 is the OEM specification.
Common mistake: The most frequent ordering error is matching only engine displacement instead of confirming the OEM belt number. If you are unsure which position a belt serves, check the parts diagram rather than assuming by size, since OMC and Volvo Penta used several similar-length belts across different accessory positions.
Sizing and fitment guidance: Match on the 45-inch effective length and 29/64-inch top width together with the 914787 / 3858462 cross-reference. If your existing belt number differs from these, confirm with your engine's serial number and accessory-drive diagram 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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