Cylinder Head Gasket – Fits Volvo Penta MD6A, MD6B Diesel Engines (Replaces 859135, 3875376)
Cylinder Head Gasket – Fits Volvo Penta MD6A, MD6B Diesel Engines (Replaces 859135, 3875376) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Volvo Penta MD6A, MD6B Diesel Engines (...
Product Details
This Cylinder Head Gasket is a crucial component for single-cylinder Volvo Penta diesel engines, specifically designed to fit MD6A (1971–1975) and MD6B (1975–1976) models. It ensures a proper seal between the cylinder head and the engine block.
It serves as a direct aftermarket replacement for Volvo Penta part numbers 859135 and 3875376. It also provides an interchange for Crom 121039 and Orbitrade ORB21379.
- Designed for engine rebuilds and cylinder head repairs.
- This part is also included in comprehensive decarbonizing gasket kits.
- Engineered for use in marine diesel environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Volvo Penta | 859135 |
| Volvo Penta | 3875376 |
| Crom | 121039 |
| Orbitrade | ORB21379 / 21379 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure accurate fitment.
| Brand | Model | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Volvo Penta | MD6A | 4-Stroke | 1971–1975 | 859135, 3875376 | |
| Volvo Penta | MD6B | 4-Stroke | 1975–1976 | 859135, 3875376 | |
| Volvo Penta | MD67C | 4-Stroke | 859135 | Listed by MarineEngine.com |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Engine Rebuild/Repair
- Fuel Type
- Diesel
- Dimensions
- 24.5" L x 8.5" W x 0.5" H
- Warranty
- Manufacturer Dependent
- Other Technical Attributes
- Part of decarbonizing gasket kit
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 859135, 3875376)
Installation Notes
- Volvo Penta recommends inspecting cylinder head nuts (463643) and studs (3875690) for elongation and replacing them as needed during gasket replacement.
- Tighten cylinder head studs to a torque of 20 Nm (14 lb-ft).
- Tighten cylinder head nuts to a torque of 70 Nm (51 lb-ft), ensuring you follow the precise tightening sequence outlined in the manufacturer's official service manual.
Troubleshooting & FAQ
Which Volvo Penta engines does this gasket fit?
This cylinder head gasket is manufactured for Volvo Penta MD6A (1971–1975) and MD6B (1975–1976) marine diesel engines. Compatibility with the MD67C has been noted by some sources, but we recommend verifying all specifications against your old part before purchasing.
What are common signs of a failed head gasket?
Symptoms of a blown head gasket include engine overheating, loss of power and compression, milky or frothy engine oil (indicating coolant contamination), and white smoke from the exhaust.
What are the correct torque specifications for installation?
When installing, torque the cylinder head studs to 20 Nm (14 lb-ft) and the cylinder head nuts to 70 Nm (51 lb-ft). It is critical to follow the tightening pattern specified in your engine’s service manual to ensure an even seal and prevent damage.
Is this gasket available as part of a larger kit?
Yes, this cylinder head gasket is commonly included as a component in complete decarbonizing gasket sets. This listing is for the individual gasket only.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. All our parts are manufactured in an ISO 9002 facility and are batch-inspected for consistency and quality.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders, and expedited options will appear at checkout where available for your location.
Warranty & returns?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for parts that are unused and in their original condition. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify all images and specifications against your original part before purchasing. If anything differs—even if your model is listed as compatible—do not order.
- This product is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is strongly recommended for safety, proper function, and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with an average transit time of 5–15 days.
- Manufacturer-Direct Value — Our parts are priced fairly by removing middleman costs, without ever compromising on materials or quality control.
Payment & Security
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