# 3843736 Belt Tensioner | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta belt tensioner from the Alternator, Charging, Electric Motor, Electric Drives group, weighing 1.497 kg and listed for 1 application on D series engines. It supersedes part number 3812555.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D9A2A

-   **Engine Family:** D

## ⚙️ Key Features

-   Alternator, Charging, Electric Motor, Electric Drives group
-   1.497 kg
-   Supersedes 3812555
-   One D series application

## 🔌 Function

Keeps the charging drive belt at its working tension, absorbing belt stretch so the alternator is driven without slip.

## ⚠️ Common Signs of Failure

-   Belt squeal, particularly on start-up or with heavy charging load
-   Charging warning or low output caused by belt slip
-   Rumble or grinding from the tensioner pulley bearing
-   Tensioner arm bouncing or its stop hammered
-   Belt dust and uneven belt wear

## 🛠️ Service Notes

-   Belt tensioner 3843730 at 1.259 kg is the other tensioner in this batch and belongs to the cooling drive, so check which drive you are working on
-   Fit a new belt with the tensioner and check pulley alignment

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3843736 → Supersedes 3812555

### OEM / Related Numbers

-   3812555 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 644.52 AUD
- **Vendor:** Volvo Penta
- **Type:** Belts, Pulleys & Tensioners
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 644.52 AUD | In stock |

## Images

- 3843736 Belt Tensioner | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3843736-belt-tensioner-genuine-volvo-penta)
> Updated: 2026-10-11