Cylinder Head Bolt Kit – Fits Volvo Penta AQ120-AQ151, 230/250 Series (Replaces 1306341)
Cylinder Head Bolt Kit – Fits Volvo Penta AQ120-AQ151, 230/250 Series (Replaces 1306341) 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 direct-replacement Cylinder Head Bolt Kit is engineered to fit a range of Volvo Penta 4-cylinder gasoline inboard/sterndrive engines from the 1970s to the 1990s, including the AQ120B, AQ125, AQ131, AQ140, AQ145, AQ151, 230, and 250 series.
It serves as a direct replacement for Volvo Penta part number 1306341.
- Designed as a direct-fit replacement for easy installation.
- Includes a full set of 10 high-strength steel bolts.
- Specifically engineered for 4-cylinder gasoline engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 1306341 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is documented to fit the following Volvo Penta models:
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Volvo Penta | AQ120B | 4-Stroke | 1306341 |
| Volvo Penta | AQ125A, AQ125B | 4-Stroke | 1306341 |
| Volvo Penta | AQ131A, AQ131B, AQ131C, AQ131D | 4-Stroke | 1306341 |
| Volvo Penta | AQ140A, BB140A | 4-Stroke | 1306341 |
| Volvo Penta | AQ145A, AQ145B, BB145A | 4-Stroke | 1306341 |
| Volvo Penta | AQ151A, AQ151B, AQ151C | 4-Stroke | 1306341 |
| Volvo Penta | 230A, 230B | 4-Stroke | 1306341 |
| Volvo Penta | 250A, 250B | 4-Stroke | 1306341 |
Technical Specs
- Product Type
- Cylinder Head Bolt Kit
- Installation
- Direct replacement
- Housing Material
- Steel
- Quantity in Kit
- 10 bolts
- Shaft Length
- 5-1/4" (133.35 mm)
- Other Technical Attributes
- For 4-cylinder gasoline engines
- Dimensions
- 23.0cm L x 9.5cm W x 4.5cm H
What’s in the Box
- 10 x Cylinder Head Bolt (Replaces 1306341)
Installation Notes
- Ensure the engine block and cylinder head surfaces are perfectly clean and dry. Debris or old gasket material can cause leaks.
- Chase the bolt hole threads in the engine block with a thread tap to clean them of any debris or rust.
- Lightly lubricate the new bolt threads and the underside of the bolt heads with engine oil or assembly lubricant.
- Install bolts finger-tight, then follow the manufacturer's specified torque sequence (typically starting from the center and spiraling outward).
- Use a calibrated torque wrench. Apply torque in multiple stages (e.g., 30%, 60%, 100%) as specified in your engine's service manual.
- After running the engine to operating temperature and letting it cool, re-check the torque if recommended by the manufacturer.
Troubleshooting & FAQ
How do I know if these bolts are correct for my engine?
Confirm your model is listed in the "Engine & Model Compatibility" table. It is critical to also visually compare the new bolts to your old ones before installation to ensure the length and thread pitch match.
Are these torque-to-yield (TTY) bolts?
These are manufactured as standard, non-TTY bolts. You should always follow the torque specifications and procedures outlined in your official Volvo Penta service manual, which may specify a final torque angle. When in doubt, consult the manual.
What are the signs of failing head bolts?
Common symptoms include coolant leaks along the cylinder head gasket seam, engine overheating, white smoke from the exhaust (burning coolant), or milky, contaminated engine oil. These signs indicate a failed head gasket, often caused by stretched or weakened head bolts.
Can I reuse my old head bolts?
It is strongly recommended to never reuse cylinder head bolts. They are critical fasteners that can stretch permanently when torqued, and reusing them risks improper clamping force, leading to head gasket failure.
What is the correct torque sequence and specification?
The exact torque values and tightening sequence are specific to your engine model. Always refer to the official Volvo Penta service manual for your engine to ensure correct and safe installation.
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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