21663840 Shim | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta D6 and D7 Cylinder-Liner Spacer-Ring Shim, selective service thickness - Part Number: 21663840

A selective spacer-ring shim used during D6 and D7 cylinder-liner service to establish the specified liner protrusion above the cylinder-block deck.

⚙️ Key Features

• Nominal selection: selective service thickness

• Cylinder-liner protrusion adjustment

• Precision-ground hardened steel

• Selected only after liner-height measurement

• Used during cylinder-block and liner repair

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• Current OEM reference: 21663840

OEM / Related Numbers:

• 21663840

• 21663836-21663840 - Selective spacer-ring shim family

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

• Volvo Penta D6 engine cylinder-liner repair procedures

• Volvo Penta D7 engine cylinder-liner repair procedures where this spacer-ring family is specified

• Correct shim must be calculated from measured liner protrusion and workshop specifications

🔌 Function

The shim raises the cylinder liner by a controlled amount so the head gasket is clamped correctly and combustion pressure remains sealed.

Common signs of failure or damage:

• Incorrect liner protrusion

• Combustion gas entering the cooling system

• Repeated cylinder-head gasket failure

• Coolant pressurisation

• Shim compressed, corroded or damaged during removal

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging