# 990985 Lock Nut | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta lock nut weighing 0.119 kg and listed for a single D-series application. It supersedes part number 963096.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D16C-A MG

-   **Engine Family:** D

## ⚙️ Key Features

-   0.119 kg
-   One D-series application
-   Supersedes 963096
-   4 used per assembly

## 🔌 Function

Holds a threaded joint against vibration, the locking feature resisting the nut turning back.

## ⚠️ Common Signs of Failure

-   Nut found loose on a heavily loaded joint
-   Locking action gone once the nut has been off
-   Thread stretched or stripped
-   Corrosion seizing the nut to its stud

## 🛠️ Service Notes

-   Listed for one application only, so check the number against your parts list before ordering
-   Check the stud or shaft thread for stretch while the nut is off

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   990985 → Supersedes 963096

### OEM / Related Numbers

-   963096 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 15.06 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 15.06 AUD | In stock |

## Images

- 990985 Lock Nut | Genuine Volvo Penta Part
- 990985 Lock Nut | Genuine Volvo Penta Part - photo 2 of 2

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/990985-lock-nut-genuine-volvo-penta)
> Updated: 2026-09-06