Double Belt Alternator Pulley – Fits Volvo Penta AD31, AD41, AQAD30/40 Series (Replaces 841812)
Double Belt Alternator Pulley – Fits Volvo Penta AD31, AD41, AQAD30/40 Series (Replaces 841812) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Double Belt Alternator Pulley – Fits Volvo Penta AD31, AD41, AQAD30...
Double Belt Alternator Pulley – Fits Volvo Penta AD31, AD41, AQAD30/40 Series (Replaces 841812) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Double Belt Alternator Pulley is designed for a broad range of Volvo Penta inboard diesel engines, including the AD31, TAMD31, TMD31, AQAD31, AD41, TAMD41, TMD41, and AQAD41 series manufactured in the 1980s and 1990s. It ensures reliable power transmission from the engine to the alternator.
It serves as a direct replacement for Volvo Penta part number 841812, offering a precise fit and restoring original performance.
- Engineered for direct bolt-on installation.
- Designed for a double V-belt configuration.
- Includes a 1-year warranty against manufacturing defects.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 841812 |
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 | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| Volvo Penta | AD31A, AD31B | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | AD31D, AD31L | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | AD31P, AD31XD | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | AQAD30A | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | AQAD31A | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | KAD32P | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | TMD31A, TMD31B | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | TMD31D, TMD31L-A | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | TAMD31A, TAMD31B | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | TAMD31D, TAMD31P, TAMD31L, TAMD31S | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | AD41A, AD41B | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | AD41D | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | AD41L, AD41P | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | AQAD40A, AQAD40B | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | AQAD41A | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | TAMD41A, TAMD41B | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | TAMD41D | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | TAMD41H, TAMD41L, TAMD41M, TAMD41P | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | TMD41A, TMD41B | 4-Stroke | 1980s–1990s | 841812 |
| Volvo Penta | TMD41D, TMD41L | 4-Stroke | 1980s–1990s | 841812 |
Technical Specs
- Product Type
- Double Belt Alternator Pulley
- Installation
- Direct bolt-on replacement
- Connection
- Direct mount to alternator shaft
- Fitting Type
- Double V-belt
- Warranty
- 1-year warranty against manufacturing defects
What’s in the Box
- 1 x Double Belt Alternator Pulley (Replaces 841812)
Installation Notes
- Disconnect the negative battery terminal to prevent electrical hazards.
- Loosen the alternator tensioner and remove the drive belt from the pulley.
- Use an impact wrench or appropriate pulley holding tool to remove the central retaining nut and slide the old pulley off the alternator shaft.
- Clean the alternator shaft and keyway, ensuring they are free of dirt and corrosion.
- Slide the new pulley onto the shaft, aligning it with the keyway.
- Reinstall and tighten the retaining nut to the manufacturer's recommended torque specification.
- Reinstall the drive belt and set the correct tension.
- Reconnect the battery terminal and start the engine to verify proper operation.
Troubleshooting & FAQ
How can I confirm this pulley fits my specific engine?
The most reliable method is to match the OEM part number 841812 from your existing pulley or service manual. You can also use our compatibility table to check if your engine model and year range are listed.
What are common signs of a failing alternator pulley?
Symptoms include a squealing or grinding noise from the engine bay, visible wobble or runout on the pulley, premature belt wear, and inconsistent charging system performance (flickering lights, battery issues).
Is a special tool required for installation?
You may need an impact wrench or a specialized alternator pulley removal tool to loosen the central nut, as it is often very tight. The specific tool depends on your alternator model.
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.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
