# 3809621 Cap | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta cap from the Cooling System group, weighing 1.46 kg and listed for 16 applications on D series engines. It supersedes 3826605, which was catalogued earlier as a cover, and 3826604.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D12C-A MP
-   Volvo Penta D12D-A MG
-   Volvo Penta D12D-A MH
-   Volvo Penta D12D-A MP
-   Volvo Penta D12D-B MH
-   Volvo Penta D12D-B MP
-   Volvo Penta D12D-C MH
-   Volvo Penta D12D-C MP
-   Volvo Penta D12D-D MP
-   Volvo Penta D12D-E MG
-   Volvo Penta D12D-E MH
-   Volvo Penta D12D-E MP
-   Volvo Penta D12D-F MP
-   Volvo Penta D12D-G MH
-   Volvo Penta D12D-G MP
-   Volvo Penta D12D-H MP

-   **Engine Family:** D

## ⚙️ Key Features

-   16 applications on D series engines
-   Supersedes 3826605 and 3826604
-   Replaces what was previously listed as a cover
-   1.46 kg

## 🔌 Function

Closes off the cooling circuit opening it fits, sealing it against coolant pressure.

## ⚠️ Common Signs of Failure

-   Coolant seeping or crusting around the cap joint
-   Pressure not holding in the circuit
-   Sealing face corroded, pitted or distorted
-   Studs or threads in the mating housing damaged
-   Repeated gasket weeping at this joint

## 🛠️ Service Notes

-   The number 3826604 that this supersedes also sits behind by-pass valve 3809467 and thermostat housing 3809577 — that earlier number covered an assembly now split across three part numbers, so identify which piece has failed
-   Renew the gasket or seal with the cap and pull the fixings up evenly

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3809621 → Supersedes 3826605

### OEM / Related Numbers

-   3826605 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 567.67 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 567.67 AUD | In stock |

## Images

- 3809621 Cap | Genuine Volvo Penta Part
- 3809621 Cap | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3809621-cap-genuine-volvo-penta)
> Updated: 2026-10-12