# 20450786 O-Ring | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine Volvo Penta o-ring used in the coolant manifold and cylinder-block sealing assembly. It is supplied as an individual service component under part number 20450786 and is intended to restore the original fit, alignment, sealing, support or operating function of the specified assembly. This listing supplies the named part only; adjoining components shown in an parts list for your engine are serviced separately unless explicitly stated.

## ⚙️ Key Features

-   0.016 kg
-   For the coolant manifold to cylinder-block sealing joint
-   Heavier section than the 0.011 kg thermostat-housing ring 20450739 and the 0.002 kg ring 20450737
-   Serviced as an individual ring

## 🔌 Function

Seals the coolant manifold against the cylinder block, keeping the coolant gallery pressure-tight where the two faces are drawn together.

## ⚠️ Common Signs of Failure

-   Coolant tracking down the side of the block below the manifold
-   Steady coolant loss that gets worse as the engine warms and pressurises
-   Staining or crusted residue along the manifold joint
-   Ring found extruded out of its groove or hardened on removal

## 🛠️ Service Notes

-   The rings in this coolant group are close in size - 0.016 kg here against 0.011 kg for 20450739 and 0.002 kg for 20450737 - so order by part number rather than by eye
-   Check the groove and both faces for pitting or corrosion before fitting a new ring; a corroded seat will leak whatever ring is used

## 📦 Condition

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

## Details

- **Price:** 41.69 AUD
- **Vendor:** Volvo Penta
- **Type:** Gaskets & Seals
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 41.69 AUD | In stock |

## Images

- 20450786 O-Ring | Genuine Volvo Penta Part
- 20450786 O-Ring | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20450786-o-ring-genuine-volvo-penta)
> Updated: 2026-10-08