# 859450 Rail | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta rail linking glow plugs 2 and 3, from the Starting System group, weighing 0.041 kg and listed for 49 applications across the AD, D, TMD, DP, HS and DPX series. The plug numbers are what separate the three rails in this run — 859451 links plugs 1 and 2 and 859449 links plugs 3 and 4, both on a narrower 11-application listing.

## 🚤 Compatibility

-   **Engine Family:** AD, D, TMD, DP, HS, DPX, SP, TAMD, KAMD, MD, KAD

Full model list at the end of this description.

## ⚙️ Key Features

-   Links glow plugs 2 and 3
-   0.041 kg
-   49 applications across six series
-   Order by plug numbers — 859451 links 1 and 2, 859449 links 3 and 4

## 🔌 Function

Carries the supply between adjacent glow plugs, connecting them into the pre-heat circuit.

## ⚠️ Common Signs of Failure

-   Slow or difficult cold starting despite pre-heat being selected
-   One or more glow plugs cold when the circuit is tested
-   Rail cracked, corroded or broken at a terminal end
-   Terminal burnt or discoloured from a high-resistance joint
-   Chafed or melted insulation along the rail

## 🛠️ Service Notes

-   Isolate the battery before working on the pre-heat circuit
-   Clean the plug terminals and check each glow plug before fitting a new rail, since a bad joint is what usually destroys them

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta AD41P-B, AD41B, AD41D, AD41, AD41A, AD41BJ
-   Volvo Penta TAMD31L-A, TAMD31M, TAMD31M-A, TAMD31A, TAMD31B, TAMD31D
-   Volvo Penta TAMD41B, TAMD41D, TAMD41M-A, TAMD41P-A, TAMD41P, TAMD41A
-   Volvo Penta AD31, AD31B, AD31D, AD31D-A, AD31XD
-   Volvo Penta DP-A, DP-A1, DP-B, DP-B1
-   Volvo Penta D41, D41B, D41D
-   Volvo Penta KAD44P, KAD44P-B, KAD44P-C
-   Volvo Penta KAMD44P-B, KAMD44P-C, KAMD44P-A
-   Volvo Penta TMD31A, TMD31B, TMD31D
-   Volvo Penta TMD41A, TMD41B, TMD41D
-   Volvo Penta 740A, 290A
-   Volvo Penta SP-A, SP-A1
-   Volvo Penta DPX
-   Volvo Penta HS1A
-   Volvo Penta MD31A

## Details

- **Price:** 191.72 AUD
- **Vendor:** Volvo Penta
- **Type:** Starters & Starting
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 191.72 AUD | In stock |

## Images

- 859450 Rail | Genuine Volvo Penta Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/859450-rail-genuine-volvo-penta)
> Updated: 2026-09-19