# 864592T1 Mercury MerCruiser Thermostat Housing Assembly | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Thermostat Housing Assembly - Part Number: 864592T1

  

A genuine Quicksilver thermostat housing assembly for selected MerCruiser V6 and V8 MPI engines with dry-joint exhaust and 7-point drain cooling systems. This housing forms the central coolant distribution point for thermostat, drain and cooling hose connections.

  

⚙️ Key Features

  

• Genuine Quicksilver OEM thermostat housing assembly

• Correct Mercury part number 864592T1

• Used on MerCruiser V6 and V8 MPI engines with dry-joint exhaust

• Designed for 7-point drain cooling-system layouts

• Direct service replacement for the specified factory thermostat housing

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 864592T1 current OEM thermostat housing reference

• 864592T related OEM reference

  

OEM / Related Numbers:

  

• 864592T1

• 864592T

• 864592-C related aftermarket casting reference

• 129170-13000 related aftermarket reference

• 8M0109441 related thermostat reference

• 27-806871 related gasket reference

• 23-806922 related sleeve reference

  

Aftermarket / Verified Equivalents:

  

• Recmar: REC864592T1

• No additional aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser MPI dry-joint cooling systems with 7-point drain layout

  

Typically suits:

  

• Engine models:

• MerCruiser 4.3L MPI V6 with dry-joint exhaust and 7-point drain cooling system

• MerCruiser 5.0L MPI V8 with dry-joint exhaust and 7-point drain cooling system

• MerCruiser 5.7L MPI V8 with dry-joint exhaust and 7-point drain cooling system

• MerCruiser 350 MAG MPI dry-joint exhaust applications using thermostat housing 864592T1

• MerCruiser 6.2L MPI V8 with dry-joint exhaust and 7-point drain cooling system

• MerCruiser V6 / V8 MPI engine packages where thermostat housing 864592T1 is specified

  

• Engine Type: MerCruiser petrol V6 / V8 MPI

• System Type: Thermostat housing / 7-point drain cooling assembly

• Exhaust Type: Dry-joint exhaust configuration

  

🔌 Function

  

The thermostat housing holds the thermostat and routes cooling water through the engine, exhaust and drain system according to engine temperature and cooling-system demand.

  

Common signs of failure:

  

• Cooling water leakage around housing

• Cracked or corroded housing

• Overheating or poor coolant flow

• Drain system leak or blocked drain connection

• Thermostat sealing issue at the housing

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 667.2 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 667.20 AUD | In stock |

## Images

- 864592T1 Mercury MerCruiser Thermostat Housing Assembly | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/864592t1-mercury-mercruiser-thermostat-housing-assembly-genuine-quicksilver-oem-part)
> Updated: 2026-05-17