# 861633 Volvo Penta Flywheel Housing | Genuine Used Part

🔧 Product Description

  

Genuine Volvo Penta MD-Series Flywheel Housing and Saildrive Adaptor - Part Number: 861633

  

A genuine used Volvo Penta flywheel housing for selected MD2010, MD2020, MD2030 and MD2040 marine diesel engines.

  

The housing bolts to the rear of the cylinder block, surrounds the flywheel and provides the mounting and alignment interface for the marine gearbox or 120S-series saildrive. It is installed with insulating plate 861636 and the associated insulating bushings and washers.

  

⚙️ Key Features

  

• Genuine Volvo Penta flywheel housing

• Correct Volvo reference 861633

• Forms the engine-to-transmission or saildrive adaptor

• Used with insulating plate 861636

• Suits compact two-, three- and four-cylinder MD-series diesels

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 861633 original Volvo Penta flywheel-housing reference

• Volvo Penta currently lists the part as replaced by a later service part according to dealer availability

  

OEM / Related Numbers:

  

• 861633

• Previous inner flywheel housing: 3580294 on selected engines

• Previous inner housing: 3580471 on MD2040C / MD2040D

• Insulating plate: 861636

• Guide sleeve: 861647

• Insulating bushing: 861635

• Insulating washers: 861634

• Sealing ring: 861823

• Mounting screws: 946470 and 946471

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta compact MD-series inboard engines

• MS-series marine gearbox installations

• Volvo Penta 120S-D and 120S-E saildrive packages

  

Typically suits:

  

• Engine models:

• Volvo Penta MD2010B

• Volvo Penta MD2010C

• Volvo Penta MD2010D

• Volvo Penta MD2020B

• Volvo Penta MD2020C

• Volvo Penta MD2020D

• Volvo Penta MD2030B

• Volvo Penta MD2030C

• Volvo Penta MD2030D

• Volvo Penta MD2040B

• Volvo Penta MD2040C

• Volvo Penta MD2040D

• 120S-D and 120S-E saildrive installations used with these engines

  

• HP Range: Approximately 9HP - 40HP

• Engine Type: Two-, three- and four-cylinder naturally aspirated marine diesel

• Year Range: Approximately 1990s - mid-2000s

  

🔌 Function

  

The housing encloses the flywheel, maintains alignment between the crankshaft and driveline and supports the gearbox or saildrive connection at the rear of the engine.

  

Common signs of failure:

  

• Cracks around mounting bosses

• Gearbox or saildrive cannot be aligned correctly

• Corroded or stripped mounting threads

• Abnormal vibration at the rear of the engine

• Flywheel rubs against the housing

• Insulating components no longer seat correctly

• Oil or water contamination enters the flywheel area

• Housing is distorted following impact or incorrect installation

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 150.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Flywheels | Engine Flywheels & Ring Gears

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 150.00 AUD | In stock |

## Images

- 861633 Volvo Penta Flywheel Housing | Genuine Used Part
- 861633 Volvo Penta Flywheel Housing | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/861633-volvo-penta-flywheel-housing-genuine-used-part)
> Updated: 2026-07-12