# 20845178 Hexagon Screw | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta Hexagon Screw - Part Number: 20845178

  

Application-specific Hexagon Screw used in the cylinder head, valve train and combustion sealing assembly on the listed Volvo Penta engines. Secures the associated component using the specified threaded connection and clamp load.

  

⚙️ Key Features

  

• Genuine Volvo Penta Hexagon Screw

• Direct service replacement for part number 20845178

• Designed for the cylinder head, valve train and combustion sealing assembly

• Secures the associated component using the specified threaded connection and clamp load

• Catalogued for TAD650VE; TAD660VE; D6E

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 20845178 (Volvo Penta OEM reference)

  

OEM / Related Numbers:

  

• VOE20845178 - Volvo Construction Equipment prefixed number format

• 3884937 - cylinder-head kit

• 20798699 - inlet valve

• 20798533 - exhaust valve

• 20459857 - valve cotter

• 20459855 - valve-stem seal

• 20799076 - tappet

• 20849976 - intake valve seat

• 20849979 - exhaust valve insert

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta D6E/TAD650/TAD660 cylinder-head and valve-train installations

  

Typically suits:

  

• Engine models:

• TAD650VE

• TAD660VE

• D6E

  

• HP Range: Approximately 180HP - 250HP

• Engine Type: 6-litre six-cylinder turbocharged diesel

• Year Range: Approximately 2004 - 2015

  

🔌 Function

  

Secures the associated component using the specified threaded connection and clamp load.

  

Common signs of failure:

  

• Rounded, stripped or damaged threads or drive surfaces

• Corrosion, stretching, cracking or permanent deformation

• Fastener repeatedly loosens or cannot retain specified torque

• Fretting or movement visible at the clamped joint

• Incorrect seating, clamp load or component alignment

  

Service / Installation Notes:

  

• Confirm thread, length, strength grade and any single-use restriction against the exact application.

• Clean the threads and use the specified torque, angle and locking method.

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 9.01 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 9.01 AUD | In stock |

## Images

- 20845178 Hexagon Screw | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20845178-hexagon-screw-genuine-volvo-penta)
> Updated: 2026-08-01