# 20970720 Cylinder Head Gasket | Genuine Volvo Penta Part

## 🔧 Product Description

OEM sealing component used in the tad550/tad551 graded multi-layer-steel cylinder-head sealing system. It restores the intended fluid-, air- or gas-tight interface when the adjoining parts are serviced. Application note: Two-dot grade, documented nominal thickness approximately 1.53 mm. Select only after measuring piston protrusion.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD550GE
-   Volvo Penta TAD551GE

-   **Engine Family:** TAD
-   **HP Range:** Approximately 220 HP
-   **Year Range:** Approximately 2000s-2010s

## ⚙️ Key Features

-   1.53 mm thick
-   Marked with two dots
-   Supersedes 20970717
-   0.649 kg
-   Two TAD-series applications
-   TH=1.53mm (Volvo assembly listing)

## 🔌 Function

Seals the cylinder head to the block, containing combustion pressure in each bore and keeping the coolant and oil galleries separate across the joint.

## ⚠️ Common Signs of Failure

-   Coolant loss, overheating or repeated pressurisation
-   Low compression, hard starting or cylinder misfire
-   External leakage at the cylinder-head joint

## 🛠️ Service Notes

-   Two dots is the thinner of this pair - 20970725 is the three-dot grade at 1.63 mm
-   Measure piston protrusion and select the grade from that measurement rather than matching the gasket that came out
-   Supersedes 20970717 - order under the current number

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   20970720 → Supersedes 20970717

### OEM / Related Numbers

-   20970717 earlier number superseded by this part
-   20970527 cylinder head

### Other-Brand OEM Numbers

-   Elring: 154.410
-   Victor Reinz: 61-43165-00
-   Glaser: H40678-00

### Aftermarket / Verified Equivalents

-   Olsson Parts: 48147 - approximately 1.5 mm two-hole gasket
-   MEC-Diesel: MEC871505

## 📦 Condition

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

## Details

- **Price:** 362.53 AUD
- **Vendor:** Volvo Penta
- **Type:** Gaskets & Seals
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 362.53 AUD | In stock |

## Images

- 20970720 Cylinder Head Gasket | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20970720-cylinder-head-gasket-genuine-volvo-penta)
> Updated: 2026-09-06