21163552 Service Kit | Genuine Volvo Penta Part

🔧 Product Description

A cooling-system service and conversion package for selected Volvo Penta 3.0-litre four-cylinder petrol engines. It replaces the earlier thermostat-housing arrangement associated with 3860841 and supplies the revised housing and connection package.

🚤 Compatibility

• HP Range: Approximately 225 HP
• Year Range: Approximately 1997-2015

⚙️ Key Features

• Revised 3.0L thermostat-housing package
• Replaces earlier cooling arrangement 3860841
• Includes the thermostat housing and formed connection components
• Used on carburetted and fuel-injected 3.0L marine engines where specified
• Cooling hoses must be routed exactly as shown in the service instructions
• Engine type: Volvo Penta GM 3.0-litre inline 4-cylinder marine petrol engine
• Also supersedes Volvo part number 3857840

📋 Kit Contents

• 1 x revised thermostat housing 3861409 / later related reference 3861550, as supplied in the kit version
• 1 x preformed cooling-hose and connection package - individual kit-only hose numbers are not fully published
• Required clamps, seals and installation hardware are supplied under service kit 21163552 where included in the sealed factory package

🔌 Function

Controls cooling-water distribution through the engine and exhaust system while providing the revised hose connections specified by Volvo Penta.

⚠️ Common Signs of Failure

• Engine overheats or runs below normal operating temperature
• Water leaks around the thermostat housing or hose connections
• Original housing is corroded, cracked or internally restricted
• Cooling hoses do not match the revised service arrangement
• Thermostat service reveals severe corrosion in the housing

🛠️ Service Notes

• Service kits are built for a specific engine family and serial-number range, and contents change between builds — confirm the kit against your engine's serial number before ordering
• Check the kit against the job before you start and fit it complete; leaving out the parts that still look serviceable defeats the point of a kit
• Renew every gasket, seal and O-ring supplied even where the old ones appear sound, and follow the tightening sequences and figures in the workshop manual for your engine
• Record the work and the engine hours when the kit goes in, so the next service falls due at the interval Volvo Penta specifies for your engine

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21163552 → Supersedes 3860841 → Supersedes 3858707

OEM / Related Numbers

• 3860841 earlier number superseded by this part
• 3858869 earlier number superseded by this part
• 3861409 thermostat housing
• 3861550 later related thermostat-housing reference

📦 Condition

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