# 21157344 Hollow Screw | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta hollow banjo screw used in pairs at the hot-water outlet / cab-heater connections on TAD750VE and TAD760VE engines. The drilled screw passes coolant through the banjo fitting while clamping the joint between two sealing gaskets.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD750VE
-   Volvo Penta TAD760VE

-   **Engine Family:** TAD
-   **HP Range:** Approximately 250-320 HP

## ⚙️ Key Features

-   Genuine Volvo Penta coolant hollow screw
-   Two used at the documented hot-water outlet / cab-heater connection
-   Confirmed for TAD750VE and TAD760VE
-   Uses gasket 947628 at the banjo joint
-   Internal drilling must remain clean and unrestricted
-   Engine type: Volvo Penta 7-litre inline-six industrial diesel
-   2 used per assembly

## 🔌 Function

Clamps the banjo connection while allowing engine coolant to flow through the drilled centre into the hot-water outlet circuit.

## ⚠️ Common Signs of Failure

-   Coolant leakage at the banjo joint
-   Blocked internal drilling and poor heater flow
-   Damaged threads or rounded screw head
-   Cracked banjo fitting from incorrect tightening
-   Air entry or coolant loss causing overheating

## 🛠️ Service Notes

-   Check the through-passage is clear and clean before fitting; a blocked hollow screw starves whatever it feeds
-   Always fit new sealing washers, one each side of the union where the original had them, and never reuse a crushed washer
-   Hold the fitting or pipe end against turning as you tighten, so the line is not twisted and the union is not pulled out of position
-   Tighten to the figure in the workshop manual for your engine — these seal by crushing the washer, not by force, and over-tightening splits the head or shears the shank
-   Bring the system up to working pressure and check for weeps before closing the space up

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   947628 - sealing gaskets
-   20450735 - upward coolant outlet pipe
-   20817900 - side coolant connection pipe
-   20412324 - flange screws
-   947281 - connection gasket
-   20483764 - nipple
-   21066503 - elbow
-   20508662 - plug
-   21801406 - guide washer

## 📦 Condition

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

## Details

- **Price:** 184.4 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 184.40 AUD | In stock |

## Images

- 21157344 Hollow Screw | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21157344-hollow-screw-genuine-volvo-penta)
> Updated: 2026-10-12