856173 Thermostat Housing | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta thermostat housing from the Cooling System group, weighing 0.549 kg and listed for 26 applications across the BB, DP, SP, MS and SHIELD groups. A second thermostat housing appears in this run - 857068, at 2.776 kg for six applications - and it is a substantially different casting, so order by part number.

🚤 Compatibility

• Engine Family: BB, DP, SP, MS, S

Full model list at the end of this description.

⚙️ Key Features

• Cooling System thermostat housing
• 0.549 kg
• 26 applications across BB, DP, SP, MS and SHIELD
• Distinct from thermostat housing 857068

🔌 Function

Encloses the thermostat and directs coolant between the engine, the bypass and the cooling circuit as the thermostat opens.

⚠️ Common Signs of Failure

• Engine slow to warm through, or running hot
• Coolant weeping or dripping from the housing joint
• Corrosion pitting across the sealing face
• Face found warped or eroded on strip-down
• Bolt hole threads pulled or stripped

🛠️ Service Notes

• Renew the thermostat and its joint at the same time - Cooling System gasket 856321 is listed here at 0.02 kg for the same 26 applications and is worth checking as the matching joint
• Make sure the sealing face is flat before refitting; a warped face will weep whatever gasket goes on it

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta 740B, 501B, 570A, 572A, 740A, 430A, 430B, 431A, 431B, 432A, 434A, 570, 500B, 430
• Volvo Penta DP-C, DP-C1, DP-D, DP-D1, DP-A, DP-A2
• Volvo Penta SP-C, SP-A2, SP-C1
• Volvo Penta BB740A
• Volvo Penta MS4B
• Volvo Penta Shield for 740A