# 3852865 O-Ring | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta o-ring supplied among the contents of the lower gearcase seal kit, from the Marine Propulsion group, listed for 23 applications across the XDP, TSK and SX families.

## 🚤 Compatibility

-   **Engine Family:** XDP, TSK, SX

Full model list at the end of this description.

## ⚙️ Key Features

-   Contents of the lower gearcase seal kit
-   23 applications across XDP, TSK and SX families
-   Published weight unusable as an identifier

## 📋 Kit Contents

-   Contents of lower gearcase seal kit

## 🔌 Function

Seals a static joint in the lower gearcase, keeping gear oil in and water out.

## ⚠️ Common Signs of Failure

-   Milky or emulsified gear oil on the dipstick
-   Oil weeping from the gearcase joint
-   O-ring flattened, nicked or hardened on removal
-   Gear oil level dropping between services

## 🛠️ Service Notes

-   Water in the gearcase means pressure and vacuum testing the leg before it is put back into service
-   O-ring 3852866 at 0.005 kg is the far wider-fitting gearcase seal kit item, so check which kit you are working from
-   Order by part number, as the published weight gives no useful check

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta SX-RT2, SX-S, SX-ST, SX-C, SX-C1, SX-C2, SX-CT, SX-CT1, SX-CT2, SX-M, SX-M1, SX-MTD, SX-MTD3, SX-RT1
-   Volvo Penta TSK XXP-A, TSK XXP-ALT, TSK XXP-D3, TSK X-B, TSK X-BLT, TSK XHP-B, TSK XHP-BLT
-   Volvo Penta XDP-B, XDP-D3

## Details

- **Price:** 7.67 AUD
- **Vendor:** Volvo Penta
- **Type:** Gaskets & Seals
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 7.67 AUD | In stock |

## Images

- 3852865 O-Ring | Genuine Volvo Penta Part
- 3852865 O-Ring | Genuine Volvo Penta Part - photo 2 of 2

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3852865-o-ring-genuine-volvo-penta)
> Updated: 2026-10-08