Volvo Penta Gasket 859090 – Fits Volvo Penta MD6, MD7 Series (Replaces 3875385)
Volvo Penta Gasket 859090 – Fits Volvo Penta MD6, MD7 Series (Replaces 3875385) 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
Volvo Penta Gasket 859090 – Fits Volvo Penta MD6, MD7 Series (Repla...
Product Details
This is a high-quality aftermarket Volvo Penta Gasket 859090, designed as a direct replacement for the crankcase aerator gasket on Volvo Penta MD6 and MD7 series marine diesel engines. It ensures a proper seal for the crankcase ventilation system, which is critical for engine health and performance.
This part is a direct interchange for Volvo Penta part number 859090 and also supersedes the older number 3875385.
- Seals the crankcase ventilation system to prevent oil leaks and maintain pressure.
- Installs between the crankcase breather housing and the engine block.
- Engineered from durable composite/paper materials for a reliable, long-lasting fit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket providers.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Volvo Penta | 3875385 | 859090 | Old part number. |
| Volvo Penta | 859090 | Current part number. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | MD6A | 4-Stroke | 859090 | Supersedes 3875385 |
| Volvo Penta | MD6B | 4-Stroke | 859090 | Supersedes 3875385 |
| Volvo Penta | MD7A | 4-Stroke | 859090 | Supersedes 3875385 |
| Volvo Penta | MD7B | 4-Stroke | 859090 | Supersedes 3875385 |
Technical Specs
- Product Type
- Crankcase Aerator/Breather Gasket
- Installation
- Between crankcase breather and engine block
- Material
- Composite/Paper
- Application
- Marine Diesel Engines
- Dimensions
- 12.8" L x 10.0" W x 0.2" H
- Warranty
- Standard Volvo Penta parts warranty
- Other Technical Attributes
- Seals crankcase ventilation system
What’s in the Box
- 1 x Gasket (859090)
Installation Notes
- Ensure the engine is off and cool to the touch. Disconnect the boat's battery for safety.
- Locate and access the crankcase breather assembly on the engine block.
- Carefully remove the fasteners holding the breather cover or housing in place.
- Remove the old gasket. Take care not to let any debris fall into the engine.
- Use a plastic scraper and an approved solvent to thoroughly clean both mounting surfaces. Ensure they are free of old gasket material, oil, and corrosion.
- Position the new gasket (859090) correctly onto the mounting surface.
- Reinstall the breather cover/housing. Tighten the fasteners to the manufacturer’s specified torque in a crisscross pattern.
- Reconnect the battery. Start the engine and carefully inspect for any signs of oil leaks around the newly installed gasket.
Troubleshooting & FAQ
How do I know this gasket will fit my engine?
This gasket is specifically designed for Volvo Penta MD6A, MD6B, MD7A, and MD7B engines. The most reliable way to confirm fitment is to check your engine model against the compatibility chart and cross-reference your old part number with our Part Number Matrix. A visual comparison with the old part is also recommended.
What are the signs of a failing crankcase breather gasket?
Common symptoms include visible oil leaks or seepage around the crankcase breather housing, a hissing or whistling sound from that area, and potentially poor or rough engine idling due to an air/vacuum leak in the ventilation system.
Do I need to use gasket sealant with this part?
Typically, this type of composite/paper gasket is designed for a dry installation. However, we always recommend consulting your official Volvo Penta service manual for the most accurate procedure, as sealant requirements can vary based on engine condition and manufacturer updates.
What is the difference between part number 859090 and 3875385?
Part number 859090 is the current, updated replacement for the older part number 3875385. They are functionally identical and fully interchangeable. Our part replaces both.
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.
