# 21388223 Sealing Kit | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine Volvo Penta seal pack for overhauling the hydraulic trim-cylinder assembly used on DPH sterndrives. It provides the matched rod, piston and housing seals needed to restore hydraulic pressure and exclude seawater.

## 🚤 Compatibility

-   **Year Range:** Approximately mid-2000s onward

## ⚙️ Key Features

-   Genuine Volvo Penta DPH trim-cylinder seal set
-   Matched hydraulic and seawater-resistant seals
-   Used during cylinder dismantling
-   Related to complete service kit 21388224
-   Drive and cylinder version must be confirmed
-   Engine type: Volvo Penta DPH sterndrive hydraulic trim system

## 📋 Kit Contents

-   1 x complete trim-cylinder sealing pack - Volvo Penta 21388223
-   Rod seals, piston seals, wipers and O-rings are supplied under complete kit 21388223; individual loose numbers are not published in the public service listing

## 🔌 Function

The seals retain hydraulic pressure inside the trim cylinder while preventing seawater and debris entering around the piston rod.

## ⚠️ Common Signs of Failure

-   Hydraulic oil leaks from the trim cylinder
-   Drive settles down after trimming
-   Cylinder rod is wet or corroded
-   Trim movement is slow or uneven
-   Cylinder has been dismantled for repair

## 🛠️ Service Notes

-   Fit every item in the kit at the same time; the kit is made up for one job and reusing an old seal alongside new ones is where leaks come back from
-   Clean and dry the sealing faces and grooves completely, taking off old gasket and sealant without scoring the metal
-   Inspect the shaft or bore each seal has to run on — a scored or corroded running surface will cut a new seal straight away
-   Lightly lubricate O-rings and lip seals with clean fluid of the type the system carries, and fit lip seals square with the lip facing the same way as the original
-   Assemble and tighten in the order and to the figures in the workshop manual for your engine, then pressure-test or run up and check for weeps

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21388223 → Supersedes 877098

### OEM / Related Numbers

-   877098 earlier number superseded by this part
-   21388224 related complete trim-cylinder service kit

## 📦 Condition

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

## Details

- **Price:** 1197.37 AUD
- **Vendor:** Volvo Penta
- **Type:** Service & Repair Kits
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1197.37 AUD | In stock |

## Images

- 21388223 Sealing Kit | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21388223-sealing-kit-genuine-volvo-penta)
> Updated: 2026-09-06