# 1545174 Valve Seat | Genuine Volvo Penta Part

## 🔧 Product Description

This is a genuine Volvo Penta valve seat for the cylinder head of MD30/MD40 and TMD/TAMD/AQAD series marine diesel engines, supplied in the Std D standard size designation. It forms the hardened sealing face the valve closes against, maintaining compression and sealing the combustion chamber. The Std D size marking is what separates this seat from other seats sharing the same name, so confirm the required size before ordering.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta MD40A
-   Volvo Penta TMD40A
-   Volvo Penta TMD40B
-   Volvo Penta TMD40C
-   Volvo Penta AQAD40B
-   Volvo Penta AQAD30A
-   Volvo Penta MD30A
-   Volvo Penta TAMD30A
-   Volvo Penta TD30A
-   Volvo Penta TMD30A
-   Volvo Penta AQAD40A
-   Volvo Penta AQD40A
-   Volvo Penta TD40A
-   Volvo Penta TAMD40A
-   Volvo Penta TAMD40B

-   **Engine Family:** MD, TMD, AQAD, TAMD, TD, AQD
-   **HP Range:** Approximately 62-165 HP
-   **Year Range:** Approximately 1973 - late 1980s

## ⚙️ Key Features

-   Genuine Volvo Penta OEM part number 1545174
-   Supplied in Std D standard size designation
-   System group: Engine
-   Net weight: 0.025 kg
-   Supersedes earlier part number 1542409, listed as an inlet valve seat
-   Fits MD30/MD40, TMD30/TMD40, TAMD30/TAMD40, TD30/TD40 and AQAD/AQD marine diesel engines
-   Engine type: Four- and six-cylinder marine diesel

## 🔌 Function

The valve seat provides the hardened, machined sealing surface in the cylinder head against which the valve face closes. It seals the combustion chamber during compression and combustion and conducts heat away from the valve head into the cylinder head.

## ⚠️ Common Signs of Failure

-   Loss of compression, hard starting or reduced power on one or more cylinders
-   Recessed, pitted or burnt seating face causing poor valve sealing
-   Cracked or loose seat insert working out of its bore in the cylinder head
-   Valve leakage causing exhaust noise, misfire or blow-by
-   Excessive valve recession requiring repeated valve clearance adjustment

## 🛠️ Service Notes

-   Installation requires controlled interference fit, concentric seat cutting and verification of valve recession/protrusion.
-   Use only after the cylinder-head recess has been measured and confirmed suitable for the standard-size seat.

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   1545174 → Supersedes 1542409

### OEM / Related Numbers

-   1542409 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 160.88 AUD
- **Vendor:** Volvo Penta
- **Type:** Engine Components
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 160.88 AUD | In stock |

## Images

- 1545174 Valve Seat | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/1545174-valve-seat-genuine-volvo-penta)
> Updated: 2026-10-12