# 20798183 Cylinder Head Gasket | Genuine Volvo Penta Part

## 🔧 Product Description

OEM sealing component used in the graded multi-layer-steel cylinder-head sealing system. It restores the specified fluid-, air- or gas-tight interface when the adjoining parts are serviced. Application note: One-hole thickness grade. Select only after measuring piston protrusion and following the Volvo Penta workshop table.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD620VE
-   Volvo Penta TAD660VE

-   **Engine Family:** TAD
-   **HP Range:** Approximately 260 HP
-   **Year Range:** Approximately late 1990s-2010s

## ⚙️ Key Features

-   Multi-layer-steel construction for high cylinder pressure
-   Graded thickness identified by holes or dots
-   Seals combustion, coolant and lubricating-oil passages
-   Must be selected from measured piston protrusion
-   Cylinder-head and block surfaces must be checked before installation
-   Engine type: Four- and six-cylinder turbocharged/common-rail diesel
-   TH=1.25mm / TH=1.26mm (Volvo assembly listing)

## 🔌 Function

Seals the joint between cylinder head and block, containing combustion pressure in each bore while keeping the coolant and lubricating-oil passages separate from each other and from the outside of the engine.

## ⚠️ Common Signs of Failure

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

## 🛠️ Service Notes

-   This is the one-hole grade, listed at 1.26 mm thick; the two-hole 20798186 and the three-hole 20798191 are the thicker grades in the same family, so count the identification holes on the gasket you remove and confirm the choice against measured piston protrusion
-   It replaces the earlier 20795927 in this grade
-   Check the head and block faces for flatness and cleanliness before fitting - a graded gasket cannot compensate for a distorted or damaged face

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   20798183 → Supersedes 20795927 → Supersedes 24426690 → Supersedes 20522328 → Supersedes 20459843

### OEM / Related Numbers

-   20795927 earlier number superseded by this part
-   24426690 earlier number superseded by this part
-   20522328 earlier number superseded by this part
-   20459843 earlier number superseded by this part
-   21055823 cylinder head
-   20459855 valve-stem seal
-   20459851 valve spring
-   20840747 spring disc
-   20459857 valve cotter
-   20840772 lock ring
-   20840807 thrust washer
-   20459852 valve seat
-   21026535 inlet valve

### OEM Reman Alternatives

-   3801233 exchange cylinder head

## 📦 Condition

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

## Details

- **Price:** 504.75 AUD
- **Vendor:** Volvo Penta
- **Type:** Gaskets & Seals
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 504.75 AUD | In stock |

## Images

- 20798183 Cylinder Head Gasket | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20798183-cylinder-head-gasket-genuine-volvo-penta)
> Updated: 2026-10-07