Piston Ring Kit – Fits Volvo Penta B23/B25 Engines (Replaces 275370)
Piston Ring Kit – Fits Volvo Penta B23/B25 Engines (Replaces 275370) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
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
Piston Ring Kit – Fits Volvo Penta B23/B25 Engines (Replaces 275370)
Product Details
This 0.30mm oversize Piston Ring Kit is designed for Volvo Penta B23 and B25 gasoline engines found in a range of sterndrive applications from 1984–1993, including various 230, 250, AQ125B, AQ131, AQ145B, AQ151, and AQ171 models. It provides the necessary components to service a single piston in a bored or honed cylinder.
This kit is a direct aftermarket replacement for Volvo Penta OEM part number 275370.
- Oversize Design: 0.30mm (0.012") for cylinders that have been machined during a rebuild.
- Single Piston Set: Contains all necessary rings to service one piston.
- Gasoline Engines: Specifically for Volvo Penta sterndrive gasoline engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 275370 |
| Aftermarket | REC275370 |
Engine & Model Compatibility
Confirm your engine model and year in the table below. This kit is compatible with the following Volvo Penta sterndrive engines.
| Brand | Model | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Volvo Penta | B23 | 4-Stroke | 275370 | Gasoline engine | |
| Volvo Penta | B25 | 4-Stroke | 275370 | Gasoline engine | |
| Volvo Penta | 230A | 4-Stroke | 1989–1992 | 275370 | Gasoline sterndrive |
| Volvo Penta | 230B | 4-Stroke | 1992–1993 | 275370 | Gasoline sterndrive |
| Volvo Penta | 250A | 4-Stroke | 1989–1992 | 275370 | Gasoline sterndrive |
| Volvo Penta | 251A | 4-Stroke | 1989–1992 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ125B | 4-Stroke | 1984–1985 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ131A | 4-Stroke | 1985–1987 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ131B | 4-Stroke | 1986–1987 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ131C | 4-Stroke | 1987–1989 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ131D | 4-Stroke | 1987–1989 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ145B | 4-Stroke | 1984–1985 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ151A | 4-Stroke | 1985–1986 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ151B | 4-Stroke | 1985–1987 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ171A | 4-Stroke | 1986–1987 | 275370 | Gasoline sterndrive |
| Volvo Penta | AQ171C | 4-Stroke | 1987–1989 | 275370 | Gasoline sterndrive |
Technical Specs
- Product Type
- Piston Ring Kit
- Application
- For one piston
- Size
- 0.30mm (0.012") oversize
- Ring Dimensions
- 1.75 x 1.75 x 3.5mm
- Fuel Type
- Gasoline
- Compatible With
- Volvo Penta B23/B25 engines
- OEM Reference
- 275370
- Package Dimensions
- 16.0" L x 16.0" W x 0.8" H
What’s in the Box
- 1 x Piston Ring Kit (equivalent to 275370) for one piston.
Installation Notes
- Ensure the engine is off, cool, and disconnected from the battery.
- Relieve fuel system pressure before beginning work.
- Remove the cylinder head and carefully extract the old piston.
- Use a piston ring expander tool to remove the old rings.
- Thoroughly clean all carbon deposits from the piston's ring grooves.
- Install the new rings in the correct order and orientation, checking for any top/bottom markings.
- Generously lubricate the cylinder walls, piston, and new rings with fresh engine oil.
- Reinstall the piston and torque all components to the manufacturer's specified values.
Troubleshooting & FAQ
How do I know if I need oversize piston rings?
Oversize rings are required when an engine cylinder has been bored or honed during a rebuild, which increases its inner diameter. Standard-size rings will not seal properly in a machined cylinder, leading to compression loss and oil consumption. Always measure your cylinder bore to confirm the required ring size.
What are the signs of failing piston rings?
Common symptoms include excessive oil consumption, blue or grey smoke from the exhaust, poor engine performance or low power (from loss of compression), and increased crankcase pressure (blow-by).
Is this a complete set for my entire engine?
No, this kit contains enough rings for a single piston. If you are rebuilding a 4-cylinder engine, you will need to purchase four of these kits.
What is the correct ring end-gap and how do I check it?
Piston ring end-gap is critical for performance and engine safety. To check it, place the new ring inside the cylinder bore and use a feeler gauge to measure the gap. You must refer to your official Volvo Penta service manual for the exact end-gap specification for your B23 or B25 engine, as it can vary.
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 and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is strongly recommended for safety and optimal 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 quality control.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
