21711728 Piston Ring Kit | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Late D4 / D6 Standard Piston Ring Kit - From SN A180871 - Part Number: 21711728

A genuine Volvo Penta standard-size piston ring set for one piston in later D4 and D6 marine diesels. The late version is identified by the 3.00mm oil-control ring and the published engine serial break.

Kit Contents:

• 1 x top compression ring - supplied within Volvo Penta kit 21711728

• 1 x second compression ring - supplied within Volvo Penta kit 21711728

• 1 x 3.00mm oil-control ring assembly - supplied within Volvo Penta kit 21711728

• One kit services one piston; four kits are required for a complete D4 and six kits for a complete D6

⚙️ Key Features

• Genuine Volvo Penta standard-size ring set

• Late 3.00mm oil-control ring design

• Published application from engine SN A180871

• Used across later D4 and D6 piston families

• Multiple marine aftermarket equivalents available

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 21711728 late-production piston-ring kit from SN A180871 where specified

OEM / Related Numbers:

• 21711728

• Late D4 / D6 piston and liner components selected by engine serial number

Aftermarket / Verified Equivalents:

• Crom Marine: 111459

• Swedish Lorry Parts: PRK-1728

• Recmar: REC21711728

• Marine Spare Parts: AM21711728

🚤 Compatibility

Commonly used on:

• D4 / D6 piston overhaul

• One-cylinder ring replacement

• Cylinder-liner and piston service

Typically suits:

• Engine models / drive models:

• Later D4-180 / 210 / 225 / 240 / 260 applications using the 3.00mm oil ring

• Later D6-280 / 310 / 330 / 350 / 370 applications using the 3.00mm oil ring

• HP Range: Approximately 180HP - 370HP

• Engine Type: Volvo Penta D4 / D6 common-rail marine diesel

• Year Range: Late production within the applicable D4 / D6 generations

• Serial Range: From engine SN A180871 where specified; piston version and standard bore must also be confirmed

🔌 Function

The rings contain combustion pressure, control the cylinder-wall oil film and transfer heat from the piston into the liner.

Common signs replacement or overhaul is required:

• Excessive crankcase blow-by

• High oil consumption or blue smoke

• Low cylinder compression

• Piston or liner is being renewed

• Oil ring thickness confirms the late 3.00mm version

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging