# 191573 Lock Washer | Genuine Volvo Penta Part

## 🔧 Product Description

This genuine Volvo Penta lock washer is a locking washer designed to resist fastener loosening under engine and propulsion vibration used in the marine-engine fastener locking point. It is manufactured to the original Volvo Penta dimensional, material and interface requirements so the serviced assembly retains its designed alignment, sealing, load capacity and operating reliability. In service, it maintains fastener tension and resists loosening from vibration. Selection must be confirmed by OEM part number 191573, the exact engine or product model, serial number and installed configuration.

## 🚤 Compatibility

-   **Engine Family:** MD, MB, AQ, TMD, AD, AQAD, D, TSK, BB, MS, B, SP, DP, AQD, TAMD
-   **HP Range:** 75 HP

Full model list at the end of this description.

## ⚙️ Key Features

-   Genuine Volvo Penta OEM lock washer
-   OEM part number 191573
-   Use a new washer in the specified orientation and tighten the matched fastener to its correct torque.

## 🔌 Function

Maintains fastener tension and resists loosening from vibration. Use a new washer in the specified orientation and tighten the matched fastener to its correct torque.

## ⚠️ Common Signs of Failure

-   Flattening or loss of spring action
-   Cracking or splitting around the washer
-   Fastener loosening and joint movement
-   Fretting or polished marks at the joint
-   Corrosion or heat damage reducing locking performance

## 🛠️ 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

### Aftermarket / Verified Equivalents

-   Sierra: 18-4260 (replacement for Volvo 191573-5)

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta 100S, 110S, 500A, 501A, 230A, 230B, 231LB, 250A, 250B, 251A, 275A, 280B, 285A, 290DP, 500, 571A
-   Volvo Penta AQ225D, AQ225E, AQ225B, AQ225C, AQ225F
-   Volvo Penta AQ130C, AQ130D, AQ130A, AQ130B
-   Volvo Penta AQ131A, AQ131B, AQ131C, AQ131D
-   Volvo Penta AQ200D, AQ200C, AQ200B, AQ200F
-   Volvo Penta AQ271A, AQ271C, AQ271B, AQ271D
-   Volvo Penta BB225A, BB225AV, BB225B, BB225C
-   Volvo Penta SP-C, SP-E, SP-A2, SP-C1
-   Volvo Penta AQ151A, AQ151B, AQ151C
-   Volvo Penta AQ170B, AQ170C, AQ170A
-   Volvo Penta BB115A, BB115B, BB115C
-   Volvo Penta BB170B, BB170C, BB170A
-   Volvo Penta BB260AV, BB260B, BB260C
-   Volvo Penta MB20A, MB20B, MB20C
-   Volvo Penta MD5A, MD5B, MD5C
-   Volvo Penta TMD40A, TMD40B, TMD40C
-   Volvo Penta AQ115A, AQ115B
-   Volvo Penta AQ171A, AQ171C
-   Volvo Penta AQ205LB, AQ205A
-   Volvo Penta AQ231A, AQ231B
-   Volvo Penta AQ255A, AQ255B
-   Volvo Penta AQ260A, AQ260B
-   Volvo Penta AQ311A, AQ311B
-   Volvo Penta AQAD40B, AQAD40A
-   Volvo Penta AQD21A, AQD21B
-   Volvo Penta MD11C, MD11D
-   Volvo Penta MD17C, MD17D
-   Volvo Penta MD21B, MD21A
-   Volvo Penta MD6A, MD6B
-   Volvo Penta MD7B, MD7A
-   Volvo Penta MS3B, MS3C
-   Volvo Penta TAMD40A, TAMD40B
-   Volvo Penta AD40B
-   Volvo Penta AQ125B
-   Volvo Penta AQ145B
-   Volvo Penta AQ165A
-   Volvo Penta AQ175A
-   Volvo Penta AQ190A
-   Volvo Penta AQ211A
-   Volvo Penta AQ240A
-   Volvo Penta AQ290A
-   Volvo Penta AQAD30A
-   Volvo Penta AQD2B
-   Volvo Penta AQD40A
-   Volvo Penta B20
-   Volvo Penta BB165A
-   Volvo Penta D2-75B
-   Volvo Penta DP-E
-   Volvo Penta MB10A
-   Volvo Penta MD1B
-   Volvo Penta MD2B
-   Volvo Penta MD3B
-   Volvo Penta MD40A
-   Volvo Penta MD67C
-   Volvo Penta MS4A
-   Volvo Penta TSK DP-E

## Details

- **Price:** 28.63 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 28.63 AUD | In stock |

## Images

- 191573 Lock Washer | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/191573-lock-washer-genuine-volvo-penta)
> Updated: 2026-09-06