Volvo Penta Gear Gasket Kit – Fits MD21A, MD21B, AQD19 (Replaces 875387)
Volvo Penta Gear Gasket Kit – Fits MD21A, MD21B, AQD19 (Replaces 875387) 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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Volvo Penta Gear Gasket Kit – Fits MD21A, MD21B, AQD19 (Replaces 87...
Product Details
This Volvo Penta Gear Gasket Kit (also known as an oil pan gasket kit) is designed for a range of Volvo Penta marine diesel engines, including the MD19, MD21A, MD21B, AQD19, AQD21A, and AQD21B models.
It serves as a direct aftermarket replacement for Volvo Penta part numbers 875387 and 875421, and provides an interchange for Orbitrade 21387.
- Includes the essential oil pan gasket (reference 840648) for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Volvo Penta | 875387 | 875421 |
| Orbitrade | 21387 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Volvo Penta | MD19 | 4-Stroke | 875387 | ||
| Volvo Penta | MD21A | 4-Stroke | 875387 | ||
| Volvo Penta | MD21B | 4-Stroke | 875387 | ||
| Volvo Penta | AQD19 | 4-Stroke | 875387 | ||
| Volvo Penta | AQD21A | 4-Stroke | 875387 | ||
| Volvo Penta | AQD21B | 4-Stroke | 875387 |
Technical Specs
- Product Type
- Gear/Oil Pan Gasket Kit
- Dimensions
- 85 × 60 × 75 mm (L × W × H)
- Weight
- 0.31 kg (0.68 lb)
- Included Components
- Includes oil pan gasket ref. 840648
What’s in the Box
- Oil pan gasket (840648)
- Additional gaskets and seals
Installation Notes
- Disconnect the battery and ensure the engine is completely cool before starting.
- Drain the engine oil into a suitable container.
- Carefully remove the fasteners for the gear housing or oil pan.
- Gently pry the housing/pan loose and remove it from the engine block.
- Thoroughly clean all old gasket material and sealant residue from both mating surfaces.
- Place the new gasket(s) from the kit onto the clean surface, ensuring proper alignment.
- Reinstall the housing/pan and tighten the fasteners to the specified torque in the sequence recommended by the manufacturer.
- Refill the engine with the correct grade and amount of fresh oil.
- Reconnect the battery, start the engine, and carefully inspect for any leaks around the newly sealed area.
Troubleshooting & FAQ
How can I be sure this gasket kit fits my Volvo Penta engine?
This kit is specifically designed for Volvo Penta models MD19, MD21A, MD21B, AQD19, AQD21A, and AQD21B. To guarantee fitment, please cross-reference your engine model and original part number (875387 or 875421) with our compatibility tables.
What are the symptoms of a failing gear or oil pan gasket?
Common signs include visible oil leaks from the bottom of the engine, a consistent drop in oil level, or oil spots under your vessel. A compromised gasket can lead to oil starvation and severe engine damage if not addressed promptly.
Do I need any special tools for installation?
Basic hand tools, a torque wrench, and a gasket scraper are required. We strongly recommend following the torque specifications in your engine's official service manual to prevent leaks and ensure a durable seal.
What is the main difference between this kit and an OEM one?
This aftermarket kit is engineered to meet or exceed original equipment (OEM) specifications for fit, form, and function. It provides a reliable, cost-effective solution without compromising on material quality or sealing performance.
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
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