# 21645842 Coolant Pipe | Genuine Volvo Penta Part

## 🔧 Product Description

Rigid engine-coolant pipe used in the Volvo Penta D13 marine cooling system. It carries coolant between the engine, heat-exchanger and adjoining pipework using the original sealing and support arrangement.

## 🚤 Compatibility

-   **Engine Family:** D

Full model list at the end of this description.

## ⚙️ Key Features

-   Genuine Volvo Penta D13 coolant pipe
-   Used in D13B marine cooling layouts
-   Original bends and flange geometry
-   Associated spacer and O-ring references identified
-   Serial-specific marine application
-   Engine type: 12.8-litre inline-six turbocharged marine diesel

## 🔌 Function

Transfers engine coolant through the D13 cooling circuit while maintaining a pressure-tight connection.

## ⚠️ Common Signs of Failure

-   Coolant seepage at pipe ends
-   Corrosion or pinhole leakage
-   Bent pipe causing poor alignment
-   Damaged O-ring lands
-   Overheating or coolant loss after service

## 🛠️ Service Notes

-   Clean both flanges or spigots and check the sealing lands for pitting and corrosion; renew every O-ring, seal or gasket at the joint rather than reusing one that has taken a set
-   Lubricate coolant-side O-rings with coolant or a rubber-safe lubricant — petroleum oil and grease swell and soften the rubber and end up in the coolant
-   Offer the pipe up and align both ends before pulling any fastener tight, so the joints are not held together by strain from a misaligned pipe or an over-stretched hose
-   Check the bore is clear of scale, sealant and debris before fitting, and inspect the pipe for internal corrosion or thinning if the old one was leaking
-   Refill with the coolant type and mix specified for your engine, bleed the system through, then check the joints again with the engine hot and up to pressure

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21645842 → Supersedes 3594795

### OEM / Related Numbers

-   3594795 earlier number superseded by this part

### Other-Brand OEM Numbers

-   VOE21645842

### Aftermarket / Verified Equivalents

-   Earlier related pipe: 3594795
-   Related pipe/component: 3849370
-   Spacer: 3155142
-   O-ring: 975697

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D13C4-B MH, D13C1-B MH, D13C2-B MP, D13C1-A MP, D13C2-A MP, D13C3-A MP, D13C4-A MP, D13B-E MG, D13B-E MG (FE), D13B-E MH, D13B-E MH (FE), D13B-F MG, D13B-F MG (FE), D13B-N MH, D13B-N MH (FE), D13B-B MP, D13B-D MP, D13B-J MP, D13B-M MP, D13C4-B MP, D13C5-B MP, D13C6-A MP, D13C1-A MH, D13C2-A MH, D13C1-B MG, D13C3-B MG, D13C2-B MG, D13C4-B MG, D13C5-A MP, D13C2-A MG, D13C1-A MG, D13C7-B MP, D13C8-B MP

## Details

- **Price:** 1098.03 AUD
- **Vendor:** Volvo Penta
- **Type:** Hoses & Pipes
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1098.03 AUD | In stock |

## Images

- 21645842 Coolant Pipe | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21645842-coolant-pipe-genuine-volvo-penta)
> Updated: 2026-10-10