21977335 Ring Kit | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta standard-size piston-ring set for one cylinder of selected D11 / TAD11 diesel engines with a 123mm cylinder bore. Six kits are required for a complete inline-six engine.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD1180-83VE
• Volvo Penta TAD1170-72VE
• Volvo Penta TAD1150-52VE
• Volvo Penta TAD1140-42VE

• Engine Family: TAD

⚙️ Key Features

• Genuine Volvo Penta standard piston-ring kit
• Correct Volvo Penta part number 21977335
• Complete three-ring set for one 123mm-bore piston
• Six kits are required for a complete six-cylinder engine
• Engine type: Volvo Penta D11 / TAD11 inline six-cylinder diesel

📋 Kit Contents

• 1 × upper compression ring - serviced under 21977335
• 1 × lower compression ring - serviced under 21977335
• 1 × oil-control ring - serviced under 21977335

🔌 Function

The compression rings seal combustion pressure above the piston, while the oil-control ring regulates the oil film on the cylinder wall and returns excess oil to the crankcase.

⚠️ Common Signs of Failure

• Low compression, excessive crankcase blow-by or hard starting
• Blue exhaust smoke and high oil consumption
• Glazed, worn or broken piston rings
• Scored cylinder liner or damaged ring grooves
• Uneven cylinder performance during compression or leak-down testing

🛠️ Service Notes

• Standard-size, three-ring set for one 123 mm-bore cylinder — six kits complete a full inline six-cylinder D11/TAD11 engine
• Oversize kits are also catalogued for these engines for a rebored cylinder — measure the actual bore rather than assuming standard size before ordering

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21907444 related piston
• 21595171 related cylinder liner
• 21765987 gudgeon pin
• 21723152 snap ring
• 21977345 related cylinder-liner kit

Other-Brand OEM Numbers

• VOE21977335
• Kolbenschmidt: 800119610000

📦 Condition

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