Cylinder Head Gasket – Fits Volvo Penta AQ115A, AQ30B, MB20A (Replaces 857621)
Cylinder Head Gasket – Fits Volvo Penta AQ115A, AQ30B, MB20A (Replaces 857621) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
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
Product Details
This high-quality Cylinder Head Gasket – Fits Volvo Penta AQ115A, AQ30B, MB20A (Replaces 857621) is engineered for a precise fit on Volvo Penta B20 series gasoline engines, commonly used in models from the 1970s and 1980s like the AQ115A, AQ30B, and MB20A.
It is a direct interchange for Volvo Penta part numbers 857621, 876783, 875543, and 419628, as well as Orbitrade 13763.
- Installation: Mounts between the engine block and cylinder head.
- Fuel Compatibility: Designed for use with gasoline engines.
- Thickness: 2.0 mm (0.079 in) to ensure a proper seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 857621 |
| Volvo Penta | 876783 |
| Volvo Penta | 875543 |
| Volvo Penta | 419628 |
| Orbitrade | 13763 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is confirmed to fit the following Volvo Penta models. Please verify your specific engine against this list.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Volvo Penta | AQ115A | 115 | 4-Stroke | 857621 | |
| Volvo Penta | AQ30B | 30 | 4-Stroke | 857621 | |
| Volvo Penta | MB20A | 4-Stroke | 857621 | ||
| Volvo Penta | BB115A | 115 | 4-Stroke | 857621 | Confirmed in secondary sources |
| Volvo Penta | BB115B | 115 | 4-Stroke | 857621 | Confirmed in secondary sources |
| Volvo Penta | AQ130B | 130 | 4-Stroke | 857621 | Referenced in multiple sources |
| Volvo Penta | B20 | 4-Stroke | 857621 | Base engine model |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Engine Block to Cylinder Head
- Fuel Type
- Gasoline
- Dimensions
- 48.0 cm × 18.0 cm × 0.5 cm (18.9 in × 7.1 in × 0.2 in)
- Thickness
- 2.0 mm (0.079 in)
- Weight
- 0.18 kg (0.4 lb)
What’s in the Box
- 1 x Cylinder Head Gasket (857621)
Installation Notes
- Disconnect the battery and completely drain the engine's cooling system.
- Remove all components blocking access to the cylinder head, such as the intake/exhaust manifolds and valve cover.
- Following the manufacturer's specified loosening sequence, remove the cylinder head bolts and lift the head off the block.
- Carefully remove the old cylinder head gasket. Thoroughly clean both the engine block deck and cylinder head mating surfaces. Ensure they are free of old gasket material, oil, and debris.
- Place the new gasket onto the engine block, confirming its orientation with the alignment dowels. Do not use sealant unless explicitly required by your service manual.
- Carefully lower the cylinder head back onto the block.
- Install new or verified head bolts and torque them in the correct sequence and stages as specified in your engine's service manual.
- Reassemble all previously removed components.
- Refill the cooling system, reconnect the battery, and start the engine. Check for any coolant or exhaust leaks around the head.
Troubleshooting & FAQ
How can I confirm this gasket fits my specific engine?
This gasket is designed for Volvo Penta B20 series gasoline engines. The best way to ensure a match is to cross-reference your engine model and OEM part number with the "Engine & Model Compatibility" and "Part Number Matrix" tables on this page.
What are the signs of a failed cylinder head gasket?
Common symptoms include engine overheating, loss of coolant with no visible external leaks, white smoke from the exhaust (burning coolant), milky or foamy engine oil, and loss of compression or engine misfires.
Should I use sealant when installing this gasket?
Most modern head gaskets are designed to be installed dry. Applying sealant can interfere with the seal. Always follow the specific instructions in your engine's official service manual.
Is this gasket appropriate for marine environments?
Yes, this part is specifically designed and manufactured for use in marine gasoline engines, built to withstand the typical conditions of a marine environment.
Can I reuse my old cylinder head bolts?
It is strongly recommended to use new head bolts, especially if they are torque-to-yield (TTY) bolts, which are designed to stretch permanently upon installation and should not be reused. Reusing old bolts can lead to improper clamping force and gasket failure.
What is the difference between an OEM and an aftermarket part?
This listing is an aftermarket replacement, not an OEM component. It has been engineered to meet or exceed OEM-level specifications using comparable materials. All our parts are produced in an ISO 9002 certified facility and are batch-inspected to ensure quality and consistency.
How fast is shipping?
We ship worldwide, with most orders arriving in 5–15 days via standard shipping. Expedited shipping options are available at checkout for certain regions. Standard shipping is free.
What is the warranty and return policy?
This product is covered by a 1-year warranty against any manufacturing defects under normal use conditions. If you encounter an issue, please contact our support team with your order number. Returns are accepted within our standard return window for items that are unused and in their original packaging.
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.
