# 21412527 Piston | Genuine Volvo Penta Part

## 🔧 Product Description

Precision hydraulic piston used inside the trim-cylinder top-end assembly of the Volvo Penta DPI-A sterndrive. It converts hydraulic pressure into linear movement and works with the specified seals, rod and cylinder components to raise, lower and hold the drive angle.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D6-300A-G
-   Volvo Penta D6-340A-G
-   Volvo Penta D6-380A-G
-   Volvo Penta DPI-A
-   Volvo Penta D6-400A-G
-   Volvo Penta D6-440A-G
-   Volvo Penta D4-150A-G
-   Volvo Penta D4-230A-G
-   Volvo Penta D4-270A-G
-   Volvo Penta D4-320A-G
-   Volvo Penta D4-300A-G

-   **Engine Family:** D, DPI
-   **HP Range:** 150-440 HP

## ⚙️ Key Features

-   Genuine Volvo Penta DPI-A hydraulic piston
-   Internal component of the trim-cylinder top-end assembly
-   Precision surface for hydraulic sealing and controlled movement
-   Must be installed with correct seals and clean hydraulic fluid
-   Drive product number and cylinder version control fitment
-   Engine type: Volvo Penta DPI hydraulic sterndrive system
-   2 used per assembly

## 🔌 Function

Separates the pressure chambers inside the trim cylinder and transfers hydraulic force to the piston rod to position the sterndrive.

## ⚠️ Common Signs of Failure

-   Drive drifts down or will not hold trim position
-   Hydraulic bypass or slow movement
-   Scored piston surface or damaged seal lands
-   Contaminated oil and internal cylinder wear
-   Uneven or jerky trim-cylinder operation

## 🛠️ 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

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21412527 → Supersedes 3861194 → Supersedes 872518

### OEM / Related Numbers

-   3861194 earlier number superseded by this part
-   872518 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 214.2 AUD
- **Vendor:** Volvo Penta
- **Type:** Drives & Propulsion
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 214.20 AUD | In stock |

## Images

- 21412527 Piston | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21412527-piston-genuine-volvo-penta)
> Updated: 2026-09-22