# 963103 Lock Nut | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta lock nut weighing 0.016 kg and listed for 35 applications on D and V series units. Four more lock nuts appear alongside it, two of them marked with a thread size, so identify the thread of the nut being replaced before ordering.

## 🚤 Compatibility

-   **Engine Family:** D, V
-   **HP Range:** 175-480 HP

Full model list at the end of this description.

## ⚙️ Key Features

-   0.016 kg
-   35 listed applications
-   Fits D and V series units
-   One of five different lock nuts listed here

## 🔌 Function

Clamps a joint from the opposite face and resists loosening under vibration through its locking feature.

## ⚠️ Common Signs of Failure

-   Nut spinning on freely, its locking feature spent
-   Joint found loose despite the nut still being in place
-   Nylon insert melted, missing or heat-glazed
-   Thread stripped or galled on the stud
-   Flats rounded by a slipping spanner

## 🛠️ Service Notes

-   Lock nuts are single-use — a nut that runs down the thread by hand has lost its locking action and must be renewed
-   Check the stud thread for damage before fitting the new nut

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   847755 referenced in the part notes

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D6-340I-G, D6-380I-G, D6-440I-G, D6-480I-G, D6-300A-G, D6-340A-G, D6-380A-G, D6-440I-WJ-G, D6-480I-WJ-G, D6-300D-G, D6-340D-G, D6-380D-G, D6-440D-G, D6-480D-G, D6-400A-G, D6-440A-G, D6-300I-G
-   Volvo Penta D4-175I-G, D4-230I-G, D4-270I-G, D4-320I-G, D4-300I-G, D4-230A-G, D4-270A-G, D4-320A-G, D4-300A-G
-   Volvo Penta V6-200-CE-P, V6-250-CE-P, V6-280-CE-P, V6-250-CE-R, V6-280-CE-R
-   Volvo Penta V8-300-CE-P, V8-350-CE-P, V8-380-CE-P, V8-430-CE-P

## Details

- **Price:** 0.56 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 0.56 AUD | In stock |

## Images

- 963103 Lock Nut | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/963103-lock-nut-genuine-volvo-penta)
> Updated: 2026-09-19