# 20578566 Cap Plug | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta Cap Plug - Part Number: 20578566

  

A genuine Volvo Penta cap plug used in the engine casting or service-opening closure. It is supplied as an individual service component under part number 20578566 and is intended to restore the original fit, sealing, alignment, retention or operating function of the specified assembly. This listing supplies the named component only; adjoining parts are serviced separately.

  

⚙️ Key Features

  

• Designed specifically for the d7 turbocharger and flywheel installation

• Exact Volvo Penta dimensions maintain fit and alignment with adjoining components

• Material and surface treatment are selected for the assigned engine environment

• Supports the documented mechanical, fluid or electrical function

• Use with the specified seals, fasteners and related assembly components

• Confirm the complete engine serial number and schematic position before installation

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 20578566 - Current genuine Volvo Penta service reference

  

OEM / Related Numbers:

  

• 20578384 - Related Connector

• 20577189 - Related Retainer

• 20576909 - Related D12 Camshaft

• 20576874 - Related Cap Plug

• 20576626 - Related Sensor

• 20576617 - Related Sensor

• 3802190 - Related Volvo Penta turbocharger reference

• 318815 / 318754 / 56209880009 - BorgWarner/Schwitzer turbo references

• 21033328 - Flywheel starter ring

• 20405654 - Flywheel retaining screw

• 20405643 - Expansion plug

• 20459927 - Stud

• 20459928 - Washer

• 20405765 - Hexagon nut

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta D7 industrial diesel engines

• TAD520/TAD720-series turbocharger, charging and flywheel installations

  

Typically suits:

  

• Engine models:

• TAD520VE

• TD720GE

• TAD720GE

• TAD720VE

• TAD721GE

• TAD721VE

• TAD722GE

• TAD722VE

• TAD730GE EDC4

• TAD730GE MECH

• TAD731GE MECH

• TAD750VE

• TAD760VE

• Engine Type: Volvo Penta D7 inline-six industrial diesel

• HP Range: Determined by the exact D7 engine rating

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

• Serial Applicability: Confirm the turbocharger, alternator, flywheel or belt configuration by engine serial number

  

🔌 Function

  

Closes a casting or manufacturing opening in the engine assembly.

  

Common signs of failure or reasons for replacement:

  

• Leakage develops around the threads or sealing face

• Threads or locking features are damaged

• The internal passage is restricted

• The connection repeatedly loosens

• The adjoining component no longer aligns or seals correctly

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 2.74 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2.74 AUD | In stock |

## Images

- 20578566 Cap Plug | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20578566-cap-plug-genuine-volvo-penta)
> Updated: 2026-07-30