Volvo Penta Valve Cover Gasket 859120
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Part Number: 859120
Brand: Volvo Penta (OEM Genuine)
Official Part Name: Gasket
Commonly Identified As: Valve Cover / Rocker Cover Gasket
The Volvo Penta 859120 is a genuine OEM valve cover gasket designed for classic MD-series marine diesel engines. It seals the rocker/valve cover to the cylinder head, containing engine oil and protecting the valve train. This is the correct replacement whenever the valve cover is disturbed or the original gasket shows signs of failure.
Engine Family
MD-series classic Volvo Penta marine diesel engines.
Compatible Applications
- Volvo Penta MD1 / MD1B
- Volvo Penta MD2 / MD2B
- Volvo Penta MD3 / MD3B
- Volvo Penta MD11 / MD11C / MD11D
- Volvo Penta MD17 / MD17C / MD17D
Serial Number Requirement
Fitment must be confirmed by engine model and serial number before ordering. On older MD-series engines, part usage can vary by production version and service history. When in doubt, match the removed gasket physically against this part number.
Superseded / Alternate Part Numbers
859120 is the primary OEM number. Common aftermarket cross-references include 859120-R, REC859120, and Orbitrade 13399. Verify any cross-reference against your specific engine before substituting.
System: Valve Train / Top End Sealing
Diagram Position: Valve cover / rocker cover interface (top of cylinder head assembly)
When to Replace
- Valve cover gasket is leaking, weeping, cracked, brittle, or compressed
- Any time the valve cover or rocker cover is removed for service
- During top-end service, valve adjustment, or engine refresh
- If oil is tracking down the side of the engine block from the cover area
Installation Notes
- Clean mating surfaces thoroughly before installing
- Torque cover bolts to the factory specification for your engine model
- Verify the removed gasket profile matches 859120 before installation
- No sealant is typically required — use the gasket dry unless your service manual specifies otherwise
Weight & Dimensions
Approximate weight: 50 g (0.05 kg). Gasket profile matches the valve cover footprint of the MD-series cylinder head. Exact dimensions vary by engine variant — match against the removed part.
Parts Desk Insights
This gasket is most commonly ordered after a valve cover leak is spotted during routine oil checks or a pre-season inspection. The typical customer scenario is an MD2 or MD3 engine with oil seeping at the top of the block — 859120 is the first part to check. Always ask the customer for the engine serial number before confirming the order; on late-production MD11 and MD17 variants, the cover design changed and fitment is not universal across all serial ranges. When a customer is already doing valve-train or top-end service, it is worth mentioning the Volvo Penta Engine Overhaul Gasket Kit 11705955 as a complete-service alternative.
Related Parts
- Volvo Penta Engine Overhaul Gasket Kit 11705955 — full top-end gasket set for MD-series engines
- Volvo Penta Gasket 3825108 — additional MD-series sealing component
- Volvo Penta Gasket 1545779 — OEM marine engine seal
- Volvo Penta Water Pump Gasket 3580576 — companion sealing part for cooling system service
- Volvo Penta MS4B Transmission Sealing Ring 853757
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.