Cylinder Head Gasket – Fits Volvo Penta 40 Series Marine Diesel (Replaces 859155, 858503)
Cylinder Head Gasket – Fits Volvo Penta 40 Series Marine Diesel (Replaces 859155, 858503) 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 40 Series Marine Diesel (Re...
Product Details
This replacement Cylinder Head Gasket is designed for a precise fit on Volvo Penta 40 series marine diesel engines manufactured between 1976 and 1986. It ensures a reliable seal between the engine block and cylinder head, which is critical for maintaining compression and preventing fluid leaks. Compatible models include AD40B, AQAD40A/B, AQD40A, MD40A, TAMD40A/B, TD40A, and TMD40A/B/C.
This part serves as a direct cross-reference for Volvo Penta part numbers 859155 and 858503, as well as Swedish Lorry Parts RM113038, providing a dependable alternative for engine repairs and overhauls.
- Engineered for direct surface mount installation on the cylinder head.
- Constructed from a durable composite multi-layer material to withstand engine pressures and temperatures.
- Also included as part of the comprehensive decarb gasket set RM121040.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Volvo Penta | 858503 | 859155 |
| Volvo Penta | 859155 | |
| Swedish Lorry Parts | RM113038 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta owners, this gasket fits a wide range of popular 40-series diesel engines from the late 1970s and early-to-mid 1980s.
| Brand | Model | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| Volvo Penta | AQAD40A | 4-Stroke | 1980–1985 | 859155/858503 |
| Volvo Penta | AQAD40B | 4-Stroke | 1982–1986 | 859155/858503 |
| Volvo Penta | AQD40A | 4-Stroke | 1977–1985 | 859155/858503 |
| Volvo Penta | MD40A | 4-Stroke | 1976–1985 | 859155/858503 |
| Volvo Penta | TAMD40A | 4-Stroke | 1980–1985 | 859155/858503 |
| Volvo Penta | TAMD40B | 4-Stroke | 1983–1986 | 859155/858503 |
| Volvo Penta | TD40A | 4-Stroke | 859155/858503 | |
| Volvo Penta | TMD40A | 4-Stroke | 1976–1985 | 859155/858503 |
| Volvo Penta | TMD40B | 4-Stroke | 1982–1986 | 859155/858503 |
| Volvo Penta | TMD40C | 4-Stroke | 1983–1986 | 859155/858503 |
| Volvo Penta | AD40B | 4-Stroke | 859155/858503 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Engine Cylinder Head
- Fuel Type
- Diesel
- Connection
- Direct Surface Mount
- Housing Material
- Composite Multi-Layer
- Housing Color
- Metallic/Gray
- Dimensions
- 80.5 cm x 25.0 cm x 1.0 cm
- Fitting Type
- Bolt-Through
- Warranty
- 12 months standard; 24 months when dealer installed
- Other Technical Attributes
- Included in decarb gasket set RM121040
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 859155/858503)
Installation Notes
- Ensure the engine is completely cool. Disconnect the battery and drain the cooling system and engine oil.
- Carefully disconnect all electrical connectors, fuel lines, coolant hoses, and exhaust components attached to the cylinder head.
- Following the manufacturer's service manual, loosen the cylinder head bolts in the correct sequence and remove the head.
- Remove the old head gasket and thoroughly clean both the engine block and cylinder head surfaces. Ensure they are free of any old gasket material, carbon deposits, and oil.
- Position the new gasket correctly on the engine block, ensuring all bolt holes and passages align. Do not use any sealant unless specified by the engine manufacturer.
- Carefully place the cylinder head onto the new gasket.
- Install and torque the head bolts in the sequence and stages specified in your engine’s service manual. This is critical for a proper seal.
- Reconnect all components, refill coolant and oil, and reconnect the battery.
- Start the engine and check for any coolant, oil, or compression leaks.
Troubleshooting & FAQ
How do I confirm this gasket fits my engine?
This gasket is for Volvo Penta 40-series marine diesel engines. The best way to confirm fitment is to check your engine model against the compatibility table provided on this page. Also, verify that your existing part number matches one of the listed interchanges: 859155 or 858503.
What are the common signs of a blown head gasket?
Symptoms of a failed cylinder head gasket include engine overheating, white smoke from the exhaust (burning coolant), milky or foamy engine oil, loss of power, and bubbles in the coolant overflow tank. If you notice any of these signs, the gasket may need replacement.
How is this different from the original Volvo Penta gasket?
This is a direct aftermarket replacement built to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It is made from high-quality, durable composite materials suitable for the marine environment but is not an OEM-branded part.
Can I reuse my old head bolts?
It is strongly recommended to use new cylinder head bolts during installation. Many head bolts are "torque-to-yield" and are designed to stretch during the initial installation, meaning they cannot provide the correct clamping force if reused.
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.
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