# 3850598 Splined socket (small) | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta splined socket in the small size, used for turning the vertical shaft in the lower unit. It is an overhaul-class special tool weighing 0.229 kg. Two other tools carry the same splined socket name and are not alternatives to it: 3850618 is listed as a holding fixture used with 3862847, and 884830 is listed for turning the vertical shaft without the lower-unit qualification.

## ⚙️ Key Features

-   Splined socket, small size
-   For turning the vertical shaft in the lower unit
-   Overhaul-class special tool, 0.229 kg
-   Three tools share this name - 3850598, 3850618 and 884830 - each with its own listed use

## 🔌 Function

Engages the splines on the vertical shaft so it can be turned in the lower unit without damaging the spline flanks.

## ⚠️ Common Signs of Failure

-   Drive square rounded or spread
-   Socket walls split or bellmouthed
-   Splines worn so the tool slips on the shaft
-   Cracks starting from the corners of the drive

## 🛠️ Service Notes

-   Splined socket 3850618 is listed as a holding fixture and 884830 for turning the vertical shaft, so check which the procedure calls for
-   A worn special tool damages the part it exists to protect, so retire it once it starts to slip

## 📦 Condition

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

## Details

- **Price:** 575.04 AUD
- **Vendor:** Volvo Penta
- **Type:** Workshop Tools
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 575.04 AUD | In stock |

## Images

- 3850598 Splined socket (small) | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3850598-socket-wrench-genuine-volvo-penta)
> Updated: 2026-09-06