# 20521558 Insulator | Genuine Volvo Penta Part

## 🔧 Product Description

This genuine Volvo Penta insulator is an OEM service component used in the Charge-Air / Starting-Aid Insulator. It is manufactured to the original Volvo Penta dimensional, material and interface requirements for the documented Volvo Penta 7-litre TAD7 generator diesel application. Technical identification: Thermal/electrical insulator used at the charge-air heater and inlet-pipe assembly. In service, it provides the specified thermal and/or electrical isolation between the heated or energised component and the surrounding engine structure. Selection must be confirmed by OEM part number 20521558, the exact model/product number, serial number and installed assembly configuration.

## 🚤 Compatibility

-   **Engine Family:** TAD

Full model list at the end of this description.

## ⚙️ Key Features

-   Genuine Volvo Penta OEM insulator
-   OEM part number 20521558
-   Technical distinction: Thermal/electrical insulator used at the charge-air heater and inlet-pipe assembly
-   Inspect for heat tracking and cracks, preserve the specified stacking order and tighten the component evenly without crushing the insulation.

## 🔌 Function

Provides the specified thermal and/or electrical isolation between the heated or energised component and the surrounding engine structure. Inspect for heat tracking and cracks, preserve the specified stacking order and tighten the component evenly without crushing the insulation.

## ⚠️ Common Signs of Failure

-   Cracking, carbon tracking or heat discolouration
-   Electrical leakage, short circuit or starting-aid fault
-   Heat transfer damaging nearby hose, cable or manifold parts
-   Loose component caused by crushed or distorted insulation
-   Arcing, burnt fasteners or repeated heater/fuse failure

## 🛠️ Service Notes

-   Note how the insulator sits and which way round it goes before taking it out — its whole job is keeping two things apart, and it only does that fitted correctly
-   Renew rather than reuse anything cracked, crushed, hardened, charred or oil-soaked; a degraded insulator has already stopped doing its job
-   Fit to clean, dry faces with the original fastener arrangement, tightened only to the figure in the workshop manual for your engine — crushing an insulator defeats it
-   Look for why the old one failed, since the heat, chafe, vibration or leak that finished it will do the same to the new one

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta TAD520GE, TAD520VE
-   Volvo Penta TAD530GE MECH, TAD530GE EDC4
-   Volvo Penta TAD531GE MECH, TAD531GE EDC4
-   Volvo Penta TAD720GE, TAD720VE
-   Volvo Penta TAD721GE, TAD721VE
-   Volvo Penta TAD722GE, TAD722VE
-   Volvo Penta TAD730GE MECH, TAD730GE EDC4
-   Volvo Penta TAD731GE MECH, TAD731GE EDC4
-   Volvo Penta TAD532GE EDC4
-   Volvo Penta TAD550GE
-   Volvo Penta TAD551GE
-   Volvo Penta TAD560VE
-   Volvo Penta TAD561VE
-   Volvo Penta TAD732GE EDC4
-   Volvo Penta TAD733GE EDC4
-   Volvo Penta TAD734GE
-   Volvo Penta TAD750GE
-   Volvo Penta TAD751GE
-   Volvo Penta TAD752GE
-   Volvo Penta TAD753GE
-   Volvo Penta TAD754GE

## Details

- **Price:** 30.77 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 30.77 AUD | In stock |

## Images

- 20521558 Insulator | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20521558-insulator-genuine-volvo-penta)
> Updated: 2026-08-22