# 21243935 Lock Ring | Genuine Volvo Penta Part

## 🔧 Product Description

A hardened retaining ring used in the drive-shaft and bearing-housing assemblies of selected DPH and DPI sterndrives. It prevents axial movement of the retained shaft, bearing or gear component.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta DPH-D1
-   Volvo Penta D6-330A-F
-   Volvo Penta D6-370A-F
-   Volvo Penta D4-260A-F
-   Volvo Penta D4-300A-F
-   Volvo Penta D6-300A-F
-   Volvo Penta D4-225A-F
-   Volvo Penta D6-300A-G
-   Volvo Penta D6-340A-G
-   Volvo Penta D6-380A-G
-   Volvo Penta DPH-E
-   Volvo Penta DPI-A
-   Volvo Penta D6-400A-G
-   Volvo Penta D6-440A-G
-   Volvo Penta D6-400A-F
-   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:** DPH, D, DPI
-   **HP Range:** 150-440 HP

## ⚙️ Key Features

-   Hardened spring-steel construction
-   Precision fit for the original groove
-   Replace whenever distorted or removed during overhaul
-   Direct replacement where part number 21243935 is specified
-   Engine type: Volvo Penta sterndrive

## 🔌 Function

Retains the shaft, gear or bearing axially within the drive housing.

## ⚠️ Common Signs of Failure

-   Excessive shaft end play
-   Ring distorted during removal
-   Groove wear
-   Bearing or gear movement
-   Severe internal drive damage if the ring releases

## 🛠️ Service Notes

-   Always fit a new lock ring rather than reusing one; once it has been spread to fit it has lost some of its grip
-   Use the correct tool and open the ring only as far as it needs to go — a ring that has been over-spread or nipped in a vice will not hold
-   Check that the groove is clean and undamaged and that the ring is seated fully round its whole circumference before the assembly is loaded
-   Fit the ring the right way round where one face is chamfered or dished, with the square-cornered face against the load
-   Reject any ring showing a twist, a bright rubbed patch or a nick, and never grind or file one to fit

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21243935 → Supersedes 3586215

### OEM / Related Numbers

-   3586215 earlier number superseded by this part
-   3862389 - drive shaft
-   3862390 - retaining nut
-   184654 - needle bushing
-   23478150 - DPI shaft
-   23553896 - sealing-ring kit

## 📦 Condition

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

## Details

- **Price:** 13.9 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 13.90 AUD | In stock |

## Images

- 21243935 Lock Ring | Genuine Volvo Penta Part
- 21243935 Lock Ring | Genuine Volvo Penta Part - photo 2 of 2

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21243935-lock-ring-genuine-volvo-penta)
> Updated: 2026-09-07