Camshaft Gear – Fits Volvo Penta 3.0L–5.7L Engines 117–150 HP (Replaces 856239, 855473, 831972)

$999.00

Camshaft Gear – Fits Volvo Penta 3.0L–5.7L Engines 117–150 HP (Replaces 856239, 855473, 831972) is backordered and will ship as soon as it is back in stock.

Worry-free returns

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.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

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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 replacement Camshaft Gear is designed for Volvo Penta 4-cylinder 3.0L engines from 1979 to 1993, covering models from 117 to 150 HP. It ensures precise valve timing and is engineered from forged steel for durability and reliable performance.

This part directly replaces Volvo Penta OEM part numbers 856239, 855473, and 831972.

Engineered for direct OEM replacement fit.
Constructed from high-strength forged steel.
Backed by a 1-year warranty against manufacturing defects.

Part Number Matrix

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

Brand	Part Number	Notes
Volvo Penta	856239	Primary Replacement
Volvo Penta	855473	Interchangeable
Volvo Penta	831972	Interchangeable

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This part is compatible with the following Volvo Penta engine models.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Volvo Penta	AQ125A	117 HP	4-Stroke	1983–1984	856239
Volvo Penta	AQ131 A, B, C, D	120 HP	4-Stroke	1985–1993	856239
Volvo Penta	AQ145B	138–139 HP	4-Stroke	1979–1988	856239
Volvo Penta	AQ151 A, B, C	146–150 HP	4-Stroke	1989–1993	856239
Volvo Penta	230	120 HP	4-Stroke	1989–1993	856239
Volvo Penta	250	146 HP	4-Stroke	1989–1993	856239

Technical Specs

Product Type: Camshaft Gear / Timing Gear
Installation: Direct OEM replacement
Housing Material: Metal (Forged Steel)
Dimensions: 5.5 cm (height) × 15.5 cm (width) × 18.0 cm (length)
Weight: 0.51 kg (1.12 lbs)
Warranty: 1-year against manufacturing defects

What’s in the Box

1 x Camshaft Gear

Installation Notes

Always disconnect the battery before starting work on the engine.
Gain access to the front of the engine to remove the timing belt cover.
Carefully align engine to Top Dead Center (TDC) and verify all timing marks before disassembly.
Remove the old timing gear using the appropriate puller tool, if necessary.
Install the new camshaft gear, ensuring it is fully seated and the timing marks align perfectly.
Re-tension the timing belt according to your engine's service manual specifications.
Reassemble all covers and components, then reconnect the battery. A professional mechanic should always verify the work.

Troubleshooting & FAQ

How do I know if my camshaft gear is failing?

Common signs of a worn or failing camshaft gear include engine rattling or a ticking noise coming from the timing cover area, rough idling, loss of power, and check engine lights related to camshaft position or timing. A visual inspection may reveal worn or broken teeth on the gear.

Is this a "square tooth" or "round tooth" gear?

This is a square tooth timing gear, as specified for the listed Volvo Penta models. Please verify against your existing part before ordering, as modifications over the years can lead to variations.

Will this fit my Volvo Penta 5.0L V8 engine?

No, this camshaft gear is specifically designed for the inline 4-cylinder 3.0L-class engines listed (AQ125, AQ131, AQ145, AQ151, etc.). It is not compatible with V6 or V8 engine architectures.

What is the difference between this and the original OEM part?

Our aftermarket gear is manufactured to meet or exceed original OEM specifications for fit, material, and performance. It is made from forged steel for high durability and serves as a direct-fit replacement for the original part numbers.

Do I need special tools for installation?

Installation typically requires standard mechanic's tools, a torque wrench, and potentially a gear puller to remove the old gear. We strongly recommend consulting a professional and your engine's official service manual for the exact procedure and required tools.

What is the recommended replacement interval?

Camshaft gears do not have a fixed replacement interval like a timing belt. They are typically replaced when they show signs of wear, damage, or during a major engine overhaul. Always inspect the gear when replacing the timing belt.

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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