V-Belt – Fits Volvo Penta AQ120-AQ170, 230A-251A (Replaces 831524, 834548, 958313, 966694)

$23.99

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You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

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Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This V-Belt – Fits Volvo Penta AQ120-AQ170, 230A-251A Marine Engines is an essential component for maintaining the charging system on various Volvo Penta 4-cylinder gasoline inboard and sterndrive engines produced from the 1970s through the 1990s. It is designed for models ranging from 120 to 170 horsepower, driving the alternator to power your vessel's electrical systems.

This part serves as a direct replacement for Volvo Penta part numbers 831524, 834548, 958313, and 966694, as well as Sierra 18-4044.

Installation: Mounts to external engine accessories.
Application: Specifically designed for 35-amp alternator setups.
Construction: Made from durable synthetic rubber reinforced with high-strength cords for longevity.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Volvo Penta	831524
Volvo Penta	834548
Volvo Penta	958313
Volvo Penta	966694
Sierra	18-4044

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Volvo Penta Models: Please verify that your engine model and original part number match the references provided. Year ranges are approximate for these vintage models.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Volvo Penta	AQ120B	120	4-Stroke	1970s–1980s	834548/966694
Volvo Penta	AQ125A	125	4-Stroke	1970s–1980s	834548/966694
Volvo Penta	AQ140A	140	4-Stroke	1970s–1980s	834548/966694
Volvo Penta	AQ145A	145	4-Stroke	1970s–1980s	834548/966694
Volvo Penta	AQ165A	165	4-Stroke	1970s–1980s	834548/966694
Volvo Penta	AQ170A	170	4-Stroke	1970s–1980s	834548/966694
Volvo Penta	AQ170B	170	4-Stroke	1970s–1980s	834548/966694
Volvo Penta	AQ170C	170	4-Stroke	1970s–1980s	834548/966694
Volvo Penta	BB140A	140	4-Stroke	1970s–1980s	834548/966694	Inboard version
Volvo Penta	BB145A	145	4-Stroke	1970s–1980s	834548/966694	Inboard version
Volvo Penta	BB165A	165	4-Stroke	1970s–1980s	834548/966694	Inboard version
Volvo Penta	BB170A	170	4-Stroke	1970s–1980s	834548/966694	Inboard version
Volvo Penta	BB170B	170	4-Stroke	1970s–1980s	834548/966694	Inboard version
Volvo Penta	BB170C	170	4-Stroke	1970s–1980s	834548/966694	Inboard version
Volvo Penta	MB10A		4-Stroke		834548/966694
Volvo Penta	230A		4-Stroke		834548/966694
Volvo Penta	230B		4-Stroke		834548/966694
Volvo Penta	250A		4-Stroke		834548/966694
Volvo Penta	250B		4-Stroke		834548/966694
Volvo Penta	251A		4-Stroke		834548/966694

Technical Specs

Product Type: V-Belt (Alternator/Generator Belt)
Installation: External Engine Accessory
Fuel Type: Gasoline
Dimensions: Length: 1075 mm (42.3 inches)
Housing Material: Synthetic rubber with high-strength cords
Other Technical Attributes: For 35-amp alternator applications

What’s in the Box

1 x V-Belt for Alternator (Replaces 831524/834548/958313/966694)

Installation Notes

Disconnect the engine's battery cables to prevent accidental starting.
Locate the alternator and identify its pivot and tensioning bolts.
Loosen the tensioning mechanism to create slack in the old belt.
Carefully slip the old belt off the alternator and crankshaft pulleys.
Inspect the pulleys for any signs of wear, damage, or grease buildup. Clean them if necessary.
Route the new V-belt over the pulleys, ensuring it is seated correctly in the grooves.
Re-tension the belt. A common rule of thumb is allowing about 1/2 inch (13 mm) of deflection with firm thumb pressure at the longest span.
Tighten the tensioner and pivot bolts securely.
Reconnect the battery, start the engine, and visually inspect the belt to ensure it is tracking properly.

Troubleshooting & FAQ

How do I confirm this V-belt is the correct size?

The best method is to match the part number from your old belt or your engine's service manual to one of the cross-reference numbers listed (e.g., 966694). Also, verify your engine model is in our compatibility list. This belt has a length of 1075 mm.

What are the signs of a failing alternator belt?

Common symptoms include a loud squealing sound from the engine bay (especially on startup or under load), visible cracks or fraying on the belt, a glazed or shiny appearance on the belt's sides, and a dimming of lights or battery charging issues.

How often should I replace my engine's V-belt?

It is recommended to inspect the belt during regular service intervals (e.g., every 50-100 hours) and replace it every 3-5 years or sooner if any signs of wear or damage are present, regardless of hours.

Why is my new belt squealing?

A new belt may squeal if it is improperly tensioned (too loose or too tight), if the pulleys are misaligned, or if there is oil or grease on the pulleys. Double-check the tension and ensure the pulley grooves are clean and dry.

Can I install this belt myself?

Yes, replacing a V-belt is a common maintenance task for those with basic mechanical skills and tools. However, improper tensioning can lead to component damage, so professional installation is always recommended if you are unsure.

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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