# 20366642 Plug | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo heavy-duty threaded plug used in shared Volvo transmission housings. The M26 × 1.5 plug closes a gearbox oil drain, fill or service opening and is used on AT, ATO and VTO transmission families rather than as a general engine-block plug.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta EPT802

-   **Engine Family:** EPT

## ⚙️ Key Features

-   M26 × 1.5 transmission-housing plug
-   Heavy-duty machined steel construction
-   Used on Volvo AT, ATO and VTO gearbox families
-   Shared Renault Trucks reference 74 20 366 642
-   Engine type: Transmission component; not engine-specific

## 🔌 Function

Closes and seals the assigned gearbox oil drain, fill or service port.

## ⚠️ Common Signs of Failure

-   Transmission-oil leakage around the plug
-   Damaged or stripped M26 × 1.5 threads
-   Rounded plug head
-   Plug loosening in service
-   Damaged sealing face or washer

## 🛠️ Service Notes

-   Clean the threads and the seating face before fitting, and make sure the opening itself is clear of old sealant, swarf and corrosion
-   Renew the sealing washer or O-ring where one is fitted rather than reusing a flattened one, and only use thread sealant where the workshop manual for your engine calls for it
-   Tighten to the figure given in the workshop manual for your engine — plugs in aluminium and other soft castings strip easily, and a plug pulled up hard to cure a leak usually distorts the seat and makes it worse
-   Where the plug closes an oil, fuel or coolant passage, run the engine up to temperature afterwards and check the joint under pressure before signing the job off
-   Keep removed plugs paired with the holes they came out of during a strip-down — plugs of very similar appearance often differ in thread, reach or sealing type

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   74 20 366 642 - Renault Trucks reference
-   88530903 - EuroRicambi reference
-   88001764 - Eurotec reference
-   ZG.30486-0008 - related cross-reference

### Aftermarket / Verified Equivalents

-   DT Spare Parts: 2.32316
-   EuroRicambi: 88530903
-   Eurotec: 88001764
-   Auger: 101652

## 📦 Condition

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

## Details

- **Price:** 34.39 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 34.39 AUD | In stock |

## Images

- 20366642 Plug | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20366642-plug-genuine-volvo-penta)
> Updated: 2026-10-10