# 20785813 Plug | Genuine Volvo Penta Part

## 🔧 Product Description

Application-specific plug used in the front cover, flywheel housing, accessory drive and auxiliary piping on the listed Volvo Penta engines. Closes the specified oil, fuel, coolant or machining passage in the auxiliary-engine assembly.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD550GE
-   Volvo Penta TAD551GE
-   Volvo Penta TAD650VE
-   Volvo Penta TAD660VE
-   Volvo Penta TAD721GE
-   Volvo Penta TAD722GE
-   Volvo Penta TAD722VE
-   Volvo Penta TAD732GE EDC4
-   Volvo Penta TAD733GE EDC4
-   Volvo Penta TAD750GE
-   Volvo Penta TAD751GE
-   Volvo Penta TAD750VE
-   Volvo Penta TAD520GE
-   Volvo Penta TAD530GE MECH
-   Volvo Penta TAD530GE EDC4
-   Volvo Penta TAD531GE MECH
-   Volvo Penta TAD531GE EDC4
-   Volvo Penta TAD532GE EDC4
-   Volvo Penta TAD760VE

-   **Engine Family:** TAD
-   **HP Range:** Approximately 140-265 HP
-   **Year Range:** Approximately 2000 - 2012

## ⚙️ Key Features

-   Genuine Volvo Penta plug
-   Direct service replacement for part number 20785813
-   Closes the specified oil, fuel, coolant or machining passage in the auxiliary-engine assembly
-   Engine type: Four- and six-cylinder turbocharged industrial diesel

## 🔌 Function

Closes the specified oil, fuel, coolant or machining passage in the auxiliary-engine assembly.

## ⚠️ Common Signs of Failure

-   Oil, fuel or coolant weeping from the plug with staining below it
-   Fluid level dropping with the leak traced to this single plug
-   The plug found loose or seeping at routine inspection
-   On removal the sealing face is bruised and the sealing washer is flattened or missing
-   Corroded or damaged M14 threads that will not pull up leak-free

## 🛠️ Service Notes

-   Confirm the exact engine model, serial number and assembly position.
-   Inspect all adjoining components and renew disturbed seals and locking hardware.

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   20785813 → Supersedes 20508605

### OEM / Related Numbers

-   20508605 earlier number superseded by this part
-   20405718 referenced in the part notes
-   20459924 - flywheel references
-   21090009 - flywheel references
-   21134648 - flywheel references
-   21033328 - starter ring gear
-   20460089 - bearing flange
-   20450835 - flywheel screws
-   20405654 - flywheel screws
-   20460206 - oil pan
-   20742661 - gaskets
-   20405888 - gaskets
-   20405915 - gaskets
-   20405792 - flange screws
-   984734 - flange screws
-   994386 - flange screws
-   20459906 - banjo nipple
-   20775904 - fitting
-   20779978 - A/C compressor clutch
-   20793522 - A/C compressor V-belt
-   20788933 - flywheel-cover spacer

### Other-Brand OEM Numbers

-   VOE20785813 - Volvo Construction Equipment prefixed number format

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 19.71 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 19.71 AUD | In stock |

## Images

- 20785813 Plug | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20785813-plug-genuine-volvo-penta)
> Updated: 2026-08-22