# 21458899 Adjusting Screw | Genuine Volvo Penta Part

## 🔧 Product Description

A later-production valve-clearance adjusting screw used in the rocker-arm assembly of Volvo Penta TAD560VE and TAD760-series engines.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD765VE
-   Volvo Penta TAD764VE
-   Volvo Penta TAD763VE
-   Volvo Penta TAD762VE
-   Volvo Penta TAD761VE

-   **Engine Family:** TAD
-   **Serial Range:** SN5311033258-

## ⚙️ Key Features

-   Precision valve-clearance adjustment
-   Hardened contact end
-   Fine-thread adjustment
-   Later serial-number specification
-   Used with inlet and exhaust rocker arms

## 🔌 Function

The screw establishes the specified running clearance between the rocker arm and valve-train component.

## ⚠️ Common Signs of Failure

-   Adjustment will not remain set
-   Pitted contact face
-   Incorrect valve clearance
-   Rounded adjustment head

## 🛠️ Service Notes

-   Note and record the existing setting before disturbing anything, so you have a reference to return to if needed
-   Release the lock nut fully before turning the screw, then reset the lock nut and re-check the setting — tightening the lock nut usually moves the adjustment
-   Set to the clearance or position given in the workshop manual for your engine using the correct feeler or gauge; do not judge the setting by feel
-   Inspect the tip and the threads and renew any screw with a worn, mushroomed or picked-up tip, because a worn tip makes the setting drift in service
-   Never use an adjusting screw to force a component into position, and carry out a hot re-check after running if the manual for your engine calls for one

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21458899 - Used from engine serial 5311033258 onward
-   20861870 - Earlier adjusting screw used through serial 5311033257

### OEM / Related Numbers

-   20861870 - Earlier adjusting screw
-   21458892 - Inlet rocker arm
-   21458904 - Exhaust rocker arm

## 📦 Condition

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

## Details

- **Price:** 54.96 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 54.96 AUD | In stock |

## Images

- 21458899 Adjusting Screw | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21458899-adjusting-screw-genuine-volvo-penta)
> Updated: 2026-09-06