# 20798548 Lock Washer | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine service component used in the common-rail d5/d7 piston and connecting-rod assembly. It restores the original Volvo Penta dimensions, fit and operating relationship.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD750VE
-   Volvo Penta TAD760VE

-   **Engine Family:** TAD
-   **HP Range:** Approximately 300 HP
-   **Year Range:** Approximately 2000s-2010s

## ⚙️ Key Features

-   Lock washer from the common-rail D5 and D7 piston and connecting-rod assembly
-   Published weight 0.86 kg, which is high for a washer - confirm the item against the parts list for your piston and connecting-rod before ordering
-   2 applications across TAD-series engines
-   Engine group

## 🔌 Function

Locks the fastener it sits under in the piston and connecting-rod assembly, holding clamp load against the reversing loads of the bottom end.

## ⚠️ Common Signs of Failure

-   A knock from the bottom end, heaviest under load
-   Metal flake found in the oil or on the filter element
-   Fastener found backed off on strip-down
-   Washer found flattened, with its locking tangs or lugs broken
-   Fretting or witness marks on the mating face where the joint has been moving

## 🛠️ Service Notes

-   Treat as single-use - fit a new lock washer whenever the joint is disturbed
-   Bottom-end fasteners are often single-use as well, so check the workshop manual before reusing anything from this joint
-   Its published weight is unusually high for a washer, so check the part against parts list for your engine rather than ordering on description alone

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   20798025 connecting rod
-   20798843 piston pin
-   20799647 small-end piston bushing
-   20850096 and 20850097 big-end bearing kits
-   20799587 connecting-rod flange screws
-   3884641 piston and cylinder-liner kit
-   20799069 piston-ring set
-   21119635 piston-pin snap ring

## 📦 Condition

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

## Details

- **Price:** 511.89 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 511.89 AUD | In stock |

## Images

- 20798548 Lock Washer | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20798548-lock-washer-genuine-volvo-penta)
> Updated: 2026-10-08