Alternator Drive Belt – Fits Volvo Penta 4.3GL/GS & OMC 4.3L Sterndrive (Replaces 3852504, 0778031, 0910371)
Alternator Drive Belt – Fits Volvo Penta 4.3GL/GS & OMC 4.3L Sterndrive (Replaces 3852504, 0778031, 0910371) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Alternator Drive Belt – Fits Volvo Penta 4.3GL/GS & OMC 4.3L St...
Product Details
This aftermarket Alternator Drive Belt – Fits Volvo Penta 4.3GL, 4.3GS & OMC Marine Engines (Replaces 3852504) is designed for a range of V6 marine engines. It is compatible with Volvo Penta 4.3L models (4.3GL, 4.3GS, 4.3GI) and various OMC Sterndrive engines from 2.3L to 8.2L, generally covering model years 1985 through 1993.
It serves as a direct replacement for Volvo Penta part number 3852504 and OMC part numbers 0778031, 0910371, and 3852504.
- Engineered with a V-belt design for proper fit and function.
- Constructed from durable neoprene/rubber with polyester/aramid reinforcement.
- Installation requires engine-specific routing and tension adjustment.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 3852504 | OEM Reference |
| OMC | 3852504 | OEM Reference |
| OMC | 0910371 | Superseded by 3852504 |
| OMC | 0778031 | Superseded by 0910371 |
| Sierra | RM3852504 | Aftermarket Interchange |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta, this belt fits 4.3L (262ci) V6 engines from 1985–1993, including the GL, GS, and select GI models.
For OMC, compatibility extends to Sterndrive models from 2.3L to 8.2L made between 1982 and 1993, including the popular Cobra 4.3L.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 4.3GL | 190 HP | 4-Stroke | 1985–1993 | 3852504 | V6, 4.3L (262 cubic inches) |
| Volvo Penta | 4.3GS | 190-210 HP | 4-Stroke | 1985–1993 | 3852504 | V6, 4.3L (262 cubic inches) |
| OMC | Cobra 4.3L Sterndrive | 4-Stroke | 1985–1993 | 0778031/0910371/3852504 | Supersession: 0778031 → 0910371 → 3852504 | |
| OMC | Sterndrive 2.3L | 4-Stroke | 1987–1988 | 0778031/0910371/3852504 | Model 232APRGDP | |
| OMC | Sterndrive 4.3L | 4-Stroke | 1985–1993 | 0778031/0910371/3852504 | Multiple model variants | |
| OMC | Sterndrive 5.0L/5.7L | 4-Stroke | 1982–1993 | 0778031/0910371/3852504 | Multiple model variants | |
| OMC | Sterndrive 7.4L | 4-Stroke | 1987–1990 | 0778031/0910371/3852504 | Models 744AMRGDP, 744APRGDP, 744APEPWS | |
| OMC | Sterndrive 8.2L | 4-Stroke | 1983–1985 | 0778031/0910371/3852504 | Models 502FTHRCRA, 502SPHRCRA, 502STHRCRA, etc. |
Technical Specs
- Product Type
- Alternator Drive Belt
- Installation
- Engine-specific routing; requires tension adjustment
- Housing Material
- Neoprene/rubber with polyester/aramid reinforcement
- Housing Color
- Black
- Operating Temperature
- -40°C to 100°C (-40°F to 212°F)
- Warranty
- 1-Year (aftermarket); Varies by manufacturer
- Other Technical Attributes
- V-belt design; OEM specification construction
What’s in the Box
- 1 x Alternator Drive Belt (3852504)
Installation Notes
- Disconnect the battery to prevent accidental starts.
- Locate the alternator and identify the belt routing path. Take a photo for reference.
- Loosen the alternator's pivot bolt and tensioning bolt.
- Carefully slide the old belt off the pulleys.
- Install the new belt, ensuring it is correctly seated in all pulley grooves.
- Apply tension to the belt. A good rule of thumb is allowing for about 1/2 inch of flex with moderate thumb pressure at the longest span.
- Tighten the alternator's tensioning and pivot bolts securely.
- Reconnect the battery and start the engine to check for proper operation and listen for any unusual noises.
Troubleshooting & FAQ
How do I find the right belt for my engine?
This belt fits specific Volvo Penta 4.3L and OMC 2.3L–8.2L engines from 1985–1993. The most reliable method is to cross-reference your existing part number or confirm your exact engine model and year in the compatibility table above.
What are common signs of a failing alternator belt?
Symptoms of a worn belt include visible cracks, fraying, or a glazed (shiny) appearance. You may also hear a loud squealing noise from the engine, especially upon startup or when electrical loads are high. A loose belt can also cause a flickering battery light.
How often should this belt be replaced?
For preventative maintenance, it is wise to inspect the belt during every service and consider replacement every 3-5 years, depending on use and conditions. Replace it immediately if you see any signs of wear or damage.
Is this belt used for power steering, too?
No, this V-belt is designed specifically for driving the alternator. Most compatible engines use a separate belt for the power steering pump, which may have different dimensions and tension requirements.
Is this an OEM or aftermarket part?
This is a high-quality aftermarket replacement part, not an OEM component. It is manufactured in an ISO 9002 certified facility to meet or exceed OEM specifications for fit, material, and performance, and it is batch-inspected for quality control.
What are the shipping speed and cost?
We offer fast worldwide shipping, with typical transit times between 5 and 15 days for most regions. Standard shipping is free. Expedited shipping options, if available for your location, will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns of unused items in their original condition are accepted within our standard return window.
Safety & Important Info
- Verify images and specifications against your original part before ordering. If anything differs—even if your model is listed as compatible—do not purchase.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is highly recommended to ensure safety, proper tensioning, and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We provide free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we offer fair pricing without compromising on materials or quality control.
Payment & Security
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