Cylinder Head Gasket – Fits Volvo Penta MD21 Series Diesel Engines (Replaces 859152, 829531)
Cylinder Head Gasket – Fits Volvo Penta MD21 Series Diesel Engines (Replaces 859152, 829531) 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
Cylinder Head Gasket – Fits Volvo Penta MD21 Series Diesel Engines ...
Product Details
This high-quality Cylinder Head Gasket is engineered to fit Volvo Penta MD21A, MD21B, AQD21A, and AQD21B series diesel marine engines manufactured between 1969 and 1981. It provides a reliable, long-lasting seal for the engine's combustion chamber, ensuring optimal performance.
It serves as a direct interchange for Volvo Penta part numbers 859152 and the superseded 829531.
- Installation: Engine Specific
- Fuel Compatibility: Diesel
- Design: Direct OEM-equivalent replacement
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 829531 | Superseded by 859152 |
| Volvo Penta | 859152 | Current OEM part number |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed exclusively for the following Volvo Penta diesel engines:
| Brand | Model | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Volvo Penta | MD21A | 4-Stroke | 1969–1979 | 859152 | Superseded from 829531 |
| Volvo Penta | MD21B | 4-Stroke | 1979–1981 | 859152 | Superseded from 829531 |
| Volvo Penta | AQD21A | 4-Stroke | 1969–1979 | 859152 | Superseded from 829531 |
| Volvo Penta | AQD21B | 4-Stroke | 1979–1981 | 859152 | Superseded from 829531 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Engine Specific
- Fuel Type
- Diesel
- Housing Material
- Composite
- Dimensions
- 52.0 cm L x 19.5 cm W x 0.4 cm H
- Design
- OEM replacement part for Volvo Penta diesel engines
What’s in the Box
- 1 x Cylinder Head Gasket (859152)
Installation Notes
- Disconnect the vessel's battery and completely drain the engine's cooling system before beginning work.
- Carefully remove all components attached to the cylinder head, such as the intake and exhaust manifolds, fuel lines, and electrical wiring.
- Unbolt the cylinder head following the sequence specified in your engine's service manual and lift it off the engine block.
- Remove the old head gasket. Meticulously clean both the cylinder head and engine block surfaces, ensuring they are free of any old material or debris.
- Position the new gasket over the alignment dowels on the engine block. Gaskets of this type are typically installed dry without sealant.
- Lower the cylinder head into place. Install and tighten the head bolts progressively in the correct sequence to the manufacturer's specified torque values.
- Re-install all previously removed components, reconnect the battery, and refill the cooling system with the appropriate coolant before starting the engine.
Troubleshooting & FAQ
Will this gasket fit my Volvo Penta AQD21A engine?
Yes, this cylinder head gasket is confirmed to be fully compatible with the Volvo Penta AQD21A, as well as the MD21A, MD21B, and AQD21B models manufactured from 1969 to 1981.
What are the common signs of a failing head gasket?
Typical symptoms of a blown head gasket include persistent engine overheating, white smoke from the exhaust (burning coolant), milky or emulsified engine oil, loss of coolant with no visible external leaks, and poor engine performance or misfires.
Should I use any sealant or adhesive during installation?
No. This gasket is designed to create a seal from compression and should be installed clean and dry. Using sealants can interfere with proper seating and torque distribution, potentially causing leaks or premature failure.
How can I confirm this part is the correct one for my engine?
Cross-reference your existing part number with the numbers listed in our Part Number Matrix (859152, 829531). Additionally, verify that your engine model and year are listed in the compatibility table.
What is the difference between an OEM and an aftermarket part?
This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch-inspections for consistency.
What are your shipping speeds and costs?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most regions; expedited options appear at checkout where available.
What is your warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is strongly recommended for safety, proper function, and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days, getting you back on the water faster.
- Manufacturer-Direct Value — We deliver fair pricing without ever compromising on materials or quality control.
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.
