Cylinder Head Gasket – Fits Volvo Penta AQ145 OHC Engine (Replaces 1378646-2)
Cylinder Head Gasket – Fits Volvo Penta AQ145 OHC Engine (Replaces 1378646-2) is backordered and will ship as soon as it is back in stock.
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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
Product Details
This Cylinder Head Gasket provides a reliable seal for the top end of Volvo Penta 4-cylinder OHC marine engines. It is engineered to fit a wide range of models from 117 to 167 HP, covering production years from 1979 to 1993, ensuring broad compatibility for engine rebuilds and maintenance.
It serves as a direct interchange for Volvo Penta part number 1378646-2, Sierra 18-2970, and GLM 36090.
- Designed for top-end engine installation.
- For use with gasoline-fueled marine engines.
- Made from high-quality composite material to OEM specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 1378646-2 |
| Sierra | 18-2970 |
| GLM | 36090 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta engines, verify your model, horsepower, and production year range to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Volvo Penta | 230A | 120 | 4-Stroke | 1989–1992 | 1378646-2 |
| Volvo Penta | 230B | 120 | 4-Stroke | 1992–1993 | 1378646-2 |
| Volvo Penta | 250A | 146 | 4-Stroke | 1989–1992 | 1378646-2 |
| Volvo Penta | 250B | 146 | 4-Stroke | 1992–1993 | 1378646-2 |
| Volvo Penta | 251A | 167 | 4-Stroke | 1989–1992 | 1378646-2 |
| Volvo Penta | AQ125B | 117 | 4-Stroke | 1984–1985 | 1378646-2 |
| Volvo Penta | AQ131A | 120 | 4-Stroke | 1985–1987 | 1378646-2 |
| Volvo Penta | AQ131B | 120 | 4-Stroke | 1986–1987 | 1378646-2 |
| Volvo Penta | AQ131C | 120 | 4-Stroke | 1987–1989 | 1378646-2 |
| Volvo Penta | AQ131D | 120 | 4-Stroke | 1987–1989 | 1378646-2 |
| Volvo Penta | AQ145A | 138 | 4-Stroke | 1979–1985 | 1378646-2 |
| Volvo Penta | AQ145B | 138 | 4-Stroke | 1984–1985 | 1378646-2 |
| Volvo Penta | AQ151A | 146 | 4-Stroke | 1985–1986 | 1378646-2 |
| Volvo Penta | AQ151B | 146 | 4-Stroke | 1985–1987 | 1378646-2 |
| Volvo Penta | AQ151C | 146 | 4-Stroke | 1987–1989 | 1378646-2 |
| Volvo Penta | AQ171A | 167 | 4-Stroke | 1986–1987 | 1378646-2 |
| Volvo Penta | AQ171C | 167 | 4-Stroke | 1987–1989 | 1378646-2 |
| Volvo Penta | BB145A | 138 | 4-Stroke | 1979–1985 | 1378646-2 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Engine Top End
- Fuel Type
- Gasoline
- Housing Material
- Composite
- Dimensions
- 48.0" L x 17.5" W x 0.2" H
- Other Technical Attributes
- For Volvo Penta 4-cylinder OHC (overhead cam) marine engines
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 1378646-2)
Installation Notes
- Disconnect the battery and completely drain the engine's cooling system.
- Remove components obstructing the cylinder head, such as the manifolds and timing assembly.
- Following the service manual's specified pattern, loosen and remove the cylinder head bolts.
- Carefully lift the cylinder head from the engine block. Avoid using pry tools that could damage the mating surfaces.
- Thoroughly clean all old gasket material and residue from both the cylinder head and engine block surfaces.
- Position the new gasket correctly on the engine block; check for proper alignment with dowel pins.
- Reinstall the cylinder head. Tighten the head bolts in the sequence and to the torque values specified in your engine's service manual.
- Reassemble all previously removed components in the reverse order of their removal.
- Refill the cooling system, reconnect the battery, and start the engine to check for any leaks.
Troubleshooting & FAQ
How do I know if my cylinder head gasket is failing?
Common signs include engine overheating, white smoke from the exhaust (burning coolant), milky or frothy engine oil (coolant contamination), or a loss of power and compression in one or more cylinders.
Is this gasket multi-layer steel (MLS) or composite?
This is a high-density composite gasket, designed to meet or exceed the performance of the original part for the specified Volvo Penta OHC engines.
Do I need to use sealant with this gasket?
This gasket is designed for a dry installation. Do not use gasket sealant unless explicitly instructed to do so by your engine's official service manual, as it can interfere with a proper seal.
Will this fit my engine if it's not on the compatibility list?
We can only guarantee correct fitment for the engine models and years specified in the compatibility table. Using it on an unlisted model is not recommended and may result in engine damage.
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
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