Piston Ring Kit – Fits Volvo Penta Gasoline Engines 0.020" Oversize (Replaces 275338)

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Product Details

This Piston Ring Kit – Fits Volvo Penta Gasoline Engines 0.020" Oversize (Replaces 275338) is designed for B21 gasoline engines found in various marine applications, including the AQ120B, AQ125A, AQ140A, BB125A, and BB140A models. These 0.020" (0.5mm) oversize piston rings are specifically intended for engine rebuilds where the cylinders have been bored to a larger diameter.

This kit serves as a direct replacement for Volvo Penta part number 275338.

Engineered for 0.020" (0.5 mm) oversize requirements.
Designed for internal installation in gasoline engines.
Complete kit for servicing a single piston.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Volvo Penta	275338

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This kit is designed for the following Volvo Penta gasoline engine models. Please verify your specific model and year before ordering.

Brand	Model	Stroke	Years	OEM Part No.
Volvo Penta	AQ120B	4-Stroke	1977–1980	275338
Volvo Penta	AQ125A	4-Stroke	1983–1984	275338
Volvo Penta	AQ140A	4-Stroke	1975–1977	275338
Volvo Penta	BB125A	4-Stroke	1983–1984	275338
Volvo Penta	BB140A	4-Stroke	1975–1979	275338

Technical Specs

Product Type: Piston Ring Kit
Installation: Engine Internal
Fuel Type: Gasoline
Size: 0.020" (0.5 mm) oversize
Ring Dimensions: 2.0 × 2.0 × 4.0 mm
Package Dimensions: 16.5 in × 10.5 in × 0.5 in

What’s in the Box

1 × Piston Ring Kit (Replaces 275338)

Installation Notes

Ensure the engine is cool and disconnect the battery before starting.
Drain the engine oil and coolant completely.
Remove the cylinder head, oil pan, and other components to access the piston.
Carefully extract the piston and connecting rod assembly from the cylinder.
Use a designated ring expander tool to remove the old piston rings.
Thoroughly clean the piston grooves to remove all carbon buildup and debris.
Verify the new ring end-gaps within the cylinder bore according to the engine service manual.
Install the new rings onto the piston in the correct order and orientation.
Generously lubricate the piston, rings, and cylinder bore with fresh engine oil.
Use a ring compressor tool to gently guide the piston assembly back into the cylinder.
Reassemble all components in reverse order, using new gaskets as required.
Torque all fasteners to the manufacturer's specified values.

Troubleshooting & FAQ

How do I know if these oversize rings are correct for my engine?

This kit is for Volvo Penta B21 engines that require a 0.020" (0.5mm) oversize ring set. This is only necessary if your cylinder has been machined (bored) during an engine rebuild. Always measure your cylinder bore to confirm an oversize is required before ordering.

What are the signs of failing piston rings?

Common symptoms include excessive blue or gray exhaust smoke (indicating oil burn), increased oil consumption between changes, a noticeable loss of engine power, and poor results from a cylinder compression test.

When should piston rings be replaced?

Piston rings do not have a fixed maintenance interval. They are a core engine component typically replaced only during a major engine overhaul or rebuild, or when diagnostics confirm they are worn beyond service limits.

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

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