# 20459854 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta TAD420VE/TAD620VE Exhaust Valve Seat - Part Number: 20459854

  

A genuine Volvo Penta valve seat used in the cylinder-head valve and combustion-sealing assembly. It is supplied as an individual service component under part number 20459854 and is intended to restore the original fit, sealing, alignment, retention or operating function of the specified assembly. This listing supplies the named part only; adjoining components shown in the engine diagram are serviced separately unless explicitly stated.

  

⚙️ Key Features

  

• Genuine Volvo Penta service component

• Designed for the cylinder-head valve and combustion-sealing assembly

• Manufactured to the specified OEM dimensions and material requirements

• Suitable for maintenance, repair or overhaul of the matching engine assembly

• Exact engine and serial-number confirmation is recommended before installation

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 20459854 - Current genuine Volvo Penta service reference

  

OEM / Related Numbers:

  

• 20459854 - Current genuine Volvo Penta service reference

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta TAD420VE industrial diesel engines

• Volvo Penta TAD620VE industrial diesel engines

• Shared D5/D7 cylinder-head, rocker and valve-cover service applications

  

Typically suits:

  

• Engine models:

• TAD420VE

• TAD620VE

• Engine Type: Volvo Penta D5/D7 industrial diesel engine family

• HP Range: Determined by the exact engine model and rating

• Year Range: Engine-generation and serial-number controlled

• Serial Applicability: Confirm the cylinder-head casting, valve-cover version and exact schematic position

  

🔌 Function

  

Provides the precision sealing and heat-transfer surface against which the engine valve closes.

  

Common signs of failure or reasons for replacement:

  

• Compression leakage is detected at the associated valve

• The seat is cracked, recessed, burnt, pitted or loose in the cylinder head

• Valve clearance changes repeatedly as the seat wears or recedes

• The valve cannot be refaced to achieve the specified sealing contact

• Cylinder-head overhaul requires replacement after valve or heat damage

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 35.61 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 35.61 AUD | In stock |

## Images

- 20459854 Valve Seat | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20459854-valve-seat-genuine-volvo-penta)
> Updated: 2026-07-30