# 21291112 Piston | Genuine Volvo Penta Part

## 🔧 Product Description

Volvo Penta lists this part as the piston kit supplied inside its published overhaul kit 3884935, for TAD650VE.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD650VE

-   **Engine Family:** TAD

## ⚙️ Key Features

-   Replaces earlier piston 20849999
-   Correct combustion-bowl and ring-groove specification
-   One piston required per cylinder
-   Engine type: Six-cylinder turbocharged industrial diesel
-   Listed by Volvo Penta as the piston kit in its overhaul kits
-   6 off in overhaul kit 3884935 (TAD650VE)
-   Used in overhaul kits: 3884935 x6 (TAD650VE)

## 🔌 Function

Receives combustion pressure and transfers force through the connecting rod to rotate the crankshaft.

## ⚠️ Common Signs of Failure

-   Excessive crankcase blow-by
-   Piston slap or internal knocking
-   Scored or cracked piston skirt
-   Broken ring lands
-   High oil consumption or blue exhaust smoke

## 🛠️ Service Notes

-   Measure the bore or liner and check it against the piston, using the size and class markings and the tolerances given in the workshop manual for your engine; pistons and bores are matched, and a worn bore needs attention before a new piston goes in
-   Fit rings with the marked face up and the gaps staggered as the manual specifies, use a proper ring compressor, and oil the piston, rings and bore before entering them
-   Observe the orientation markings on the piston and the pairing marks between piston and connecting rod so each assembly goes back in its own cylinder the right way round
-   Use new pin retaining clips or circlips, check the pin fit and the rod bearing shells, and confirm the piston moves freely on the pin as the manual describes
-   Where the manual calls for a piston protrusion or crown height check to select the gasket, carry it out before final assembly; then turn the engine over by hand to confirm free movement before starting
-   Volvo Penta's overhaul kits call for 6 off of this part

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21291112 → Supersedes 20849999

### OEM / Related Numbers

-   20849999 earlier number superseded by this part
-   04284390 related reference
-   04501383 related reference

### Other-Brand OEM Numbers

-   Kolbenschmidt 40441600 piston supplied with rings and piston pin
-   Kolbenschmidt 40441960 piston and cylinder-liner repair kit
-   Kolbenschmidt 40441961 piston and cylinder-liner repair kit

## 📦 Condition

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

## Details

- **Price:** 748.75 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 748.75 AUD | In stock |

## Images

- 21291112 Piston | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21291112-piston-genuine-volvo-penta)
> Updated: 2026-10-08