# 21246490 Cap Nut | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine enclosed cap nut used in the mechanical governor and fuel-regulation assembly of Volvo Penta D1 and D2 diesel engines. The closed end protects the exposed thread while retaining the associated linkage or adjustment component.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D2-40F
-   Volvo Penta D1-30F
-   Volvo Penta D1-13
-   Volvo Penta D1-13B
-   Volvo Penta D1-13F
-   Volvo Penta D1-20
-   Volvo Penta D1-20B
-   Volvo Penta D1-20F

-   **Engine Family:** D
-   **HP Range:** 13-40 HP

## ⚙️ Key Features

-   Genuine Volvo Penta cap nut
-   Closed-end construction protects the threaded component
-   Used in compact-engine governor assemblies
-   Correct OEM thread and seating profile
-   Helps preserve the calibrated linkage position
-   Quantity varies by assembly, most commonly one

## 🔌 Function

The cap nut retains and protects the end of the associated governor or control linkage fastener.

## ⚠️ Common Signs of Failure

-   Damaged internal thread
-   Split or distorted cap
-   Rounded hexagon
-   Nut unable to retain adjustment
-   Contact damage from incorrect tools

## 🛠️ Service Notes

-   Check the thread length before fitting — a cap nut is closed at the end, so a stud that is too long, or grit in the blind end, will bottom the nut and give a false torque before the joint is properly clamped
-   Tighten to the figure in the workshop manual for your engine; the closed head is not a reason to keep pulling on it
-   Where the cap nut retains a pipe, cone or sealing washer, renew the sealing element and make sure the pipe enters square and unstressed before tightening
-   Renew any cap nut that is corroded, has damaged threads or rounded flats, and refit whatever washer or locking arrangement belonged with it
-   Marine-grade anti-seize on stainless threads reduces galling and makes later removal possible, but keep it off threads that must take a locking compound

## 📦 Condition

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

## Details

- **Price:** 6.94 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 6.94 AUD | In stock |

## Images

- 21246490 Cap Nut | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21246490-cap-nut-genuine-volvo-penta)
> Updated: 2026-10-08