# 21158911 Reversing Gear Kit | Genuine Volvo Penta Part

## 🔧 Product Description

A complete Volvo Penta hydraulic marine reversing-gear assembly with a nominal reduction ratio of 2.71:1. The ratio-specific gear train is supplied with the HS25 clutch, piston, shaft and bearing system as one factory package.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D3-110I-C
-   Volvo Penta D3-130I-C
-   Volvo Penta D2-55F
-   Volvo Penta D2-50F
-   Volvo Penta D2-75F
-   Volvo Penta D2-60F
-   Volvo Penta D3-110I-G
-   Volvo Penta D3-110I-H
-   Volvo Penta D3-160I-C
-   Volvo Penta HS25A
-   Volvo Penta HS25A-B
-   Volvo Penta HS25

-   **Engine Family:** D, HS
-   **HP Range:** 50-160 HP
-   **Year Range:** Approximately 2000-2011

## ⚙️ Key Features

-   Complete HS25 reversing gear with 2.71:1 reduction ratio
-   Hydraulically operated multi-disc forward and reverse clutches
-   Used with HS25A-B and HS25A-C transmission installations
-   Includes the principal internal shaft, piston, spring, disc and bearing components
-   Propeller selection and engine installation must match the exact ratio
-   Engine type: Hydraulic marine reversing gear with multi-disc clutch packs

## 📋 Kit Contents

-   1 x input shaft 3584037 - supersedes earlier 3582208
-   1 x internal shaft 3582211
-   2 x balls 3582112
-   2 x rings 3582108
-   2 x clutch pistons 3582106
-   2 x rings 3582110
-   6 x clutch springs 3582114
-   1 x retaining / lock ring 3582118
-   1 x ring 3582117
-   8 x friction or clutch discs 3582100
-   6 x steel discs 3582098
-   2 x end discs 3582104
-   2 x snap rings 3582102
-   1 x key 3582089
-   2 x needle bearings 3582077
-   Additional ratio-specific gears and factory-assembled internal components are supplied under the complete reversing-gear kit number and are not all available as separately itemised service parts

## 🔌 Function

Transfers engine torque to the propeller shaft, provides hydraulic forward and reverse engagement and reduces output speed by the stated ratio.

## ⚠️ Common Signs of Failure

-   Forward or reverse engagement is delayed or slips
-   Transmission pressure is below specification
-   Metal or friction material is present in the oil
-   Abnormal bearing or gear noise develops
-   Incorrect reduction ratio causes propeller or engine-load problems

## 🛠️ Service Notes

-   Work clean and dry — the reversing gear circulates its oil through everything in this kit, so grit introduced during assembly ends up in the gears and bearings
-   Fit the new seals, gaskets and locking parts supplied with the kit and discard the corresponding old ones, including any that still look serviceable
-   Inspect the flexible coupling, shift linkage, control cable and mountings while the gear is accessible; worn ones will undo the benefit of the new parts
-   Refill with the oil grade and quantity specified for your reversing gear, then recheck the level after a short run once the new parts have taken up oil
-   Confirm the gear engages fully and cleanly in both ahead and astern and returns properly to neutral before the boat is used

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21158911 → Supersedes 3583956 → Supersedes 3583958 → Supersedes 3581832

### OEM / Related Numbers

-   3583956 earlier number superseded by this part
-   3583958 earlier number superseded by this part
-   3581832 earlier number superseded by this part
-   3584037 input shaft
-   3582208 earlier input-shaft reference
-   3582211 internal shaft
-   3582106 clutch piston
-   3582114 clutch spring
-   3582100 friction / clutch disc
-   3582098 steel clutch disc
-   3582104 end disc
-   3582077 needle bearing

## 📦 Condition

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

## Details

- **Price:** 9341.96 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 9341.96 AUD | In stock |

## Images

- 21158911 Reversing Gear Kit | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21158911-reversing-gear-kit-genuine-volvo-penta)
> Updated: 2026-08-22