# 20798186 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: Two-hole grade; documented nominal thickness approximately 1.36 mm with approximately 99 mm bore. Confirm by piston-protrusion measurement.

## 🚤 Compatibility

Typically suits:

-   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=1.36mm (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 two-hole grade, listed at 1.36 mm thick; the one-hole 20798183 is the thinner grade and the three-hole 20798191 the thicker, so count the identification holes on the gasket you remove and confirm the choice against measured piston protrusion
-   It replaces the earlier 20795944 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

-   20798186 → Supersedes 20795944 → Supersedes 24426691 → Supersedes 20522329 → Supersedes 20459844

### OEM / Related Numbers

-   20795944 earlier number superseded by this part
-   24426691 earlier number superseded by this part
-   20522329 earlier number superseded by this part
-   20459844 earlier number superseded by this part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

### Other-Brand OEM Numbers

-   Deutz 04285284 / 04289404
-   Elring: 697.560
-   Victor Reinz: 61-37690-40
-   Deutz: 04289404

### OEM Reman Alternatives

-   3801233 exchange cylinder head

### Aftermarket / Verified Equivalents

-   DT Spare Parts: 2.01039

## 📦 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

- 20798186 Cylinder Head Gasket | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20798186-cylinder-head-gasket-genuine-volvo-penta)
> Updated: 2026-10-12