# 850418 O-Ring | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta o-ring from the Marine Propulsion group, weighing 0.005 kg and listed for 102 applications across the AQ, MD, TMD, AD, AQAD and D series. It supersedes part number 814166, which was catalogued earlier as a gasket, so an older parts list may show a flat gasket where this o-ring is now supplied.

## 🚤 Compatibility

-   **Engine Family:** AQ, MD, TMD, AD, AQAD, D, TAMD, B, BB, AQD

Full model list at the end of this description.

## ⚙️ Key Features

-   0.005 kg
-   Supersedes 814166, formerly catalogued as a gasket
-   102 applications across six engine series
-   Quantity varies by assembly, most commonly six

## 🔌 Function

Seals the joint between two components by being squeezed into its groove, keeping oil or water on the correct side of the housing.

## ⚠️ Common Signs of Failure

-   Weeping or dripping from the joint after a run
-   Oil level dropping with no other obvious source
-   Milky oil where water has found its way in
-   Ring flattened, nipped or split on removal
-   Ring gone hard and taken a permanent set

## 🛠️ Service Notes

-   The number it replaces was listed as a gasket, so check the groove and the mating face are suited to a round-section seal
-   Lubricate the ring lightly on assembly and take care not to trap it as the housing pulls up
-   Always fit a new ring rather than reusing one that has been compressed

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   850418 → Supersedes 814166

### OEM / Related Numbers

-   814166 earlier number superseded by this part

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta 500A, 501A, 740A, 230A, 230B, 250A, 250B, 251A
-   Volvo Penta AD41P-B, AD41B, AD41, AD41A, AD41BJ
-   Volvo Penta B230, B230E, B230F, B230FB, B230FX
-   Volvo Penta AQ130C, AQ130D, AQ130A, AQ130B
-   Volvo Penta AQ131A, AQ131B, AQ131C, AQ131D
-   Volvo Penta AQ225D, AQ225E, AQ225B, AQ225C
-   Volvo Penta AQ271A, AQ271C, AQ271B, AQ271D
-   Volvo Penta AQ151A, AQ151B, AQ151C
-   Volvo Penta AQ170B, AQ170C, AQ170A
-   Volvo Penta AQ200D, AQ200C, AQ200B
-   Volvo Penta TAMD41B, TAMD41M-A, TAMD41A
-   Volvo Penta TMD40A, TMD40B, TMD40C
-   Volvo Penta AD31, AD31B
-   Volvo Penta AQ125B, AQ125A
-   Volvo Penta AQ145B, AQ145A
-   Volvo Penta AQ171A, AQ171C
-   Volvo Penta AQ231A, AQ231B
-   Volvo Penta AQ255A, AQ255B
-   Volvo Penta AQ260A, AQ260B
-   Volvo Penta AQ311A, AQ311B
-   Volvo Penta AQAD40B, AQAD40A
-   Volvo Penta AQD21A, AQD21B
-   Volvo Penta D41, D41B
-   Volvo Penta TAMD31A, TAMD31B
-   Volvo Penta TAMD40A, TAMD40B
-   Volvo Penta TMD31A, TMD31B
-   Volvo Penta TMD41A, TMD41B
-   Volvo Penta AD30A
-   Volvo Penta AD40B
-   Volvo Penta AQ120B
-   Volvo Penta AQ140A
-   Volvo Penta AQ165A
-   Volvo Penta AQ175A
-   Volvo Penta AQ190A
-   Volvo Penta AQ211A
-   Volvo Penta AQ240A
-   Volvo Penta AQ290A
-   Volvo Penta AQAD30A
-   Volvo Penta AQD40A
-   Volvo Penta BB140A
-   Volvo Penta BB145A
-   Volvo Penta BB231A
-   Volvo Penta BB261A
-   Volvo Penta BB740A
-   Volvo Penta MD21B
-   Volvo Penta MD30A
-   Volvo Penta MD31A
-   Volvo Penta MD40A
-   Volvo Penta TAMD30A
-   Volvo Penta TMD30A

## Details

- **Price:** 13.49 AUD
- **Vendor:** Volvo Penta
- **Type:** Gaskets & Seals
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 13.49 AUD | In stock |

## Images

- 850418 O-Ring | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/850418-o-ring-genuine-volvo-penta)
> Updated: 2026-10-08