# 3840921 Insert | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta insert from the Cooling System group, weighing 2.438 kg and listed for 10 applications on D series engines. It sits within 23 grams of insert 3840379 at 2.461 kg, so the published weights do not separate them - order by part number, using the application count as a secondary check. End cover 3840924 shares the same 10 applications and is likely to be needed with it.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D3-110I-B
-   Volvo Penta D3-110I-C
-   Volvo Penta D3-130I-C
-   Volvo Penta D3-130A-B
-   Volvo Penta D3-160A-B
-   Volvo Penta D3-130A-C
-   Volvo Penta D3-160A-C
-   Volvo Penta D3-160I-C
-   Volvo Penta D3-130I-B
-   Volvo Penta D3-160I-B

-   **Engine Family:** D
-   **HP Range:** 110-160 HP

## ⚙️ Key Features

-   2.438 kg
-   10 applications on D series engines
-   Only 23 grams apart from insert 3840379, so weight is no guide
-   Same application count as end cover 3840924

## 🔌 Function

Forms the internal element of its cooling assembly, directing coolant flow through the housing.

## ⚠️ Common Signs of Failure

-   Coolant temperature climbing under load
-   Weeping from the housing joints
-   Passages scaled up or packed with silt
-   Erosion or corrosion pitting on the insert faces
-   Coolant loss with no visible external leak

## 🛠️ Service Notes

-   Order by number, as insert 3840379 is almost identical on the scales
-   Renew all seals and gaskets and consider end cover 3840924 at the same time
-   Flush the cooling system so the new insert does not silt up straight away

## 📦 Condition

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

## Details

- **Price:** 1908.48 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1908.48 AUD | In stock |

## Images

- 3840921 Insert | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3840921-insert-genuine-volvo-penta)
> Updated: 2026-10-07