# 20860349 Lock Washer | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine Volvo Penta lock washer used to secure the oil-cooler/filter control-plunger assembly. The washer maintains fastener retention and valve-stack position despite engine vibration, oil-pressure pulsation and repeated temperature cycles.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD560VE
-   Volvo Penta TAD561VE
-   Volvo Penta TAD734GE
-   Volvo Penta TAD752GE
-   Volvo Penta TAD753GE
-   Volvo Penta TAD754GE
-   Volvo Penta TAD765VE
-   Volvo Penta TAD764VE
-   Volvo Penta TAD763VE
-   Volvo Penta TAD762VE
-   Volvo Penta TAD761VE

-   **Engine Family:** TAD

## ⚙️ Key Features

-   Genuine Volvo Penta Oil Control Valve Lock Washer - part number 20860349
-   Application-specific locking washer for the oil-housing valve assembly
-   Maintains the installed position of the insert, sleeve and control components
-   Provides the original locking geometry and bearing diameter
-   Helps preserve the calibrated spring preload and plunger travel
-   Designed for the specified fastener and housing recess
-   Replace after removal if the locking feature has been flattened or damaged
-   Engine type: D5/D7-series oil-cooler and oil-filter housings

## 🔌 Function

The washer prevents the valve-retaining fastener or insert from loosening. By preserving the assembled stack height, it helps maintain the spring preload and plunger movement on which the oil-bypass calibration depends.

## ⚠️ Common Signs of Failure

-   Retaining component loosens in service
-   Visible flattening or loss of locking tension
-   Fretting around the fastener or washer seat
-   Oil-control components shift from their installed position
-   Repeated loosening caused by damaged threads or incorrect torque

## 🛠️ Service Notes

-   Lock washers are single-use: the spring or the lock is set by the first tightening, so fit a new one whenever the fastener is disturbed
-   Refit in the same arrangement as the parts came off, with the washer bearing on a clean, flat, undamaged seat
-   Where the washer is a tab or bent type, bend the tab firmly against a flat of the fastener after final tightening, and never bend the same tab back and forth twice
-   Tighten the fastener to the figure in the workshop manual for your engine — a lock washer secures a correctly tightened fastener, it does not compensate for a slack one

## 🔄 Supersession & Cross Reference

### Other-Brand OEM Numbers

-   VOE20860349

## 📦 Condition

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

## Details

- **Price:** 21.11 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 21.11 AUD | In stock |

## Images

- 20860349 Lock Washer | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20860349-lock-washer-genuine-volvo-penta)
> Updated: 2026-10-12