# 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

## Details

- **Price:** 115.73 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 115.73 AUD | In stock |

## Images

- 21663840 Shim | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21663840-shim-genuine-volvo-penta)
> Updated: 2026-08-03