# 971085 Lock Nut | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta lock nut used when the later model belt guard is installed, weighing 0.027 kg and listed for 12 applications across the THD, DH and TAMD families. The parts listing cross-refers to group 26, and this number consolidates 863914, 945879 and 971091.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta THD102KB
-   Volvo Penta THD102KD
-   Volvo Penta THD102K-KB
-   Volvo Penta DH10A
-   Volvo Penta TAMD102A
-   Volvo Penta TAMD102D
-   Volvo Penta TAMD103A
-   Volvo Penta TAMD122A
-   Volvo Penta TAMD122A/C
-   Volvo Penta TAMD122P-A
-   Volvo Penta TAMD122P-B
-   Volvo Penta TAMD122P-C

-   **Engine Family:** THD, DH, TAMD

## ⚙️ Key Features

-   For installations with the later model belt guard
-   0.027 kg
-   Consolidates 863914, 945879 and 971091
-   Cross-referred to group 26
-   Quantity varies by assembly, most commonly 8
-   Also supersedes Volvo part numbers 846800 and 849494

## 🔌 Function

Holds its fastening against loosening, the locking feature keeping tension on the thread so vibration cannot back the nut off.

## ⚠️ Common Signs of Failure

-   Belt guard rattling or found loose
-   Nut spinning down the thread with no resistance, so the locking feature is spent
-   Thread picked up or galled on removal
-   Guard mounting holes elongated from movement

## 🛠️ Service Notes

-   Belt guard type decides this one, so confirm the engine has the later model guard before ordering
-   A lock nut that runs freely down the thread has lost its locking action and should be renewed rather than refitted
-   Three earlier numbers now lead here, so an out-of-date parts list will still bring the right nut

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   971085 → Supersedes 863914

### OEM / Related Numbers

-   945879 earlier number superseded by this part
-   971091 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 3.93 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3.93 AUD | In stock |

## Images

- 971085 Lock Nut | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/971085-lock-nut-genuine-volvo-penta)
> Updated: 2026-09-06