Piston Ring Kit – Fits Volvo Penta D4/D6 (Replaces 21711728)
Piston Ring Kit – Fits Volvo Penta D4/D6 (Replaces 21711728) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Piston Ring Kit – Fits Volvo Penta D4/D6 (Replaces 21711728)
Product Details
This Piston Ring Kit is an aftermarket replacement designed for Volvo Penta D4 and D6 diesel engines with serial numbers A180871 and higher. It provides a reliable solution for engine rebuilds, ensuring proper cylinder sealing and performance.
This kit serves as a direct replacement for Volvo Penta part number 21711728.
- Installation Type: Engine Internal Component
- Fuel Compatibility: Diesel
- Ring Thickness: 3.00 mm
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21711728 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta engines, please ensure your model's serial number is A180871 or higher as specified in the notes column.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | D4 | 4-Stroke | 21711728 | For SN-A180871+ |
| Volvo Penta | D6 | 4-Stroke | 21711728 | For SN-A180871+ |
Technical Specs
- Product Type
- Piston Ring Kit
- Installation
- Engine Internal Component
- Fuel Type
- Diesel
- Ring Thickness
- 3.00 mm
- Engine Compatibility
- For D4/D6 engines with serial numbers A180871+
- Product Dimensions
- 12.5" L x 12.5" W x 2.0" H
What’s in the Box
- 1 x Kit Piston Ring (21711728)
Installation Notes
- Disconnect the battery and ensure the engine is completely cool before starting.
- Drain the engine oil and coolant into suitable containers.
- Remove the cylinder head and oil pan to gain access to the pistons.
- Carefully extract the piston and connecting rod assembly from the cylinder.
- Use a dedicated piston ring expander tool to remove the old rings.
- Thoroughly clean all carbon deposits from the piston ring grooves.
- Install the new rings in the correct sequence and orientation, checking end gaps against the engine's service manual.
- Lubricate the piston, new rings, and cylinder bore with fresh engine oil.
- Use a piston ring compressor to gently guide the piston back into the cylinder.
- Reassemble all engine components, torquing fasteners to the manufacturer's specifications.
- Refill the engine with the correct grade of oil and coolant.
- Reconnect the battery, start the engine, and check for leaks and proper operation.
Troubleshooting & FAQ
How do I know if this piston ring kit is correct for my engine?
This kit is specifically for Volvo Penta D4 and D6 diesel engines with serial numbers A180871 and higher. It is a direct replacement for OEM part number 21711728 and has a ring thickness of 3.00mm. Always verify your engine's serial number and part requirements before ordering.
What are the signs of failing piston rings?
Common symptoms include excessive blue or white smoke from the exhaust, high oil consumption, loss of engine power, and poor results from a cylinder compression test.
Is a special tool required for installation?
Yes, professional installation is recommended. Specialized tools such as a piston ring expander (for removal) and a piston ring compressor (for installation) are necessary to avoid damaging the new rings or the piston.
What is the recommended replacement interval for piston rings?
Piston rings are typically replaced during a major engine overhaul or rebuild. There is no fixed service interval; replacement is determined by engine performance, oil consumption, and diagnostic tests.
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
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