23083950 Piston Ring Kit | Genuine Volvo Penta Part

🔧 Product Description

A genuine 0.5mm oversize piston-ring set for one D4 or D6 piston used with a 101.5mm finished cylinder bore. It is not a standard-bore ring set and must only be installed with the matching oversize machining and piston specification.

🚤 Compatibility

• HP Range: Approximately 180-480 HP
• Year Range: Approximately 2000s-2010s

⚙️ Key Features

• Complete ring set for one piston
• 0.5mm oversize specification
• 101.5mm finished bore
• Used on selected D4 and D6 rebuilds
• Engine type: Volvo Penta D4 or D6 common-rail marine diesel

📋 Kit Contents

• Complete oversize compression and oil-control ring set - Volvo Penta 23083950

🔌 Function

The rings seal combustion pressure, regulate the cylinder-wall oil film and transfer piston heat into the cylinder bore.

⚠️ Common Signs of Failure

• Broken, stuck or worn piston rings
• Engine has been machined to 101.5mm oversize

🛠️ Service Notes

• Check the end gap of each ring in the bore it will run in and compare it with the figure in the workshop manual for your engine; a worn or rebored cylinder changes it
• Fit the rings the right way up — where a face is marked or the section is stepped, that face goes towards the piston crown, and an oil control ring's expander must be fitted without overlapping its own ends
• Use a ring expander rather than levering rings on with a screwdriver, and open them only as far as they need to go; cast rings snap and the groove edges nick easily
• Stagger the ring gaps round the piston as the manual for your engine directs, so that no two gaps line up
• Oil the rings, bore and compressor lightly, enter the bore with a ring compressor, and never force the piston in — if it resists, back it out and find out why

🔄 Supersession & Cross Reference

Aftermarket / Verified Equivalents

• Swedish Lorry Parts PRK-728X
• Aftermarket 101.5mm D4 / D6 ring sets must match ring thickness, profile and piston-groove specification

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging