21648630 Kit | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta complete thermostat-housing service assembly for selected D3 marine diesel engines. The kit replaces the earlier housing reference and supplies the assembled coolant outlet and thermostat-control unit rather than requiring the housing to be rebuilt from unrelated parts.

🚤 Compatibility

• HP Range: Approximately 110-190 HP
• Year Range: Approximately 2003 - 2009

⚙️ Key Features

• Genuine Volvo Penta complete coolant-control assembly
• Replaces earlier housing 3593801
• Factory-machined hose and sensor connections
• Restores thermostat regulation and housing sealing
• Serial-specific D3 fitment
• Engine type: Volvo Penta first-generation D3 inline 5-cylinder marine diesel

📋 Kit Contents

• 1 x complete thermostat housing assembly - Volvo Penta 21648630
• Internal thermostat and housing seals - supplied as part of the complete assembly where fitted
• Earlier complete housing reference replaced by the kit - Volvo Penta 3593801

🔌 Function

The housing routes coolant between the cylinder head, heat exchanger and bypass circuit while the thermostat regulates engine operating temperature.

⚠️ Common Signs of Failure

• Coolant leaks from the housing seam or hose neck
• Housing is cracked or corroded
• Engine runs too hot or too cold
• Thermostat bore or sealing face is damaged
• A replacement long block requires the correct outlet assembly

🛠️ Service Notes

• Check the kit contents against the parts list for your engine before you start, and confirm it is the kit specified for your engine's serial number — kit contents change between engine versions
• Lay the contents out and identify every item against the assembly as it comes apart, so nothing is left over at the end
• Use all the new parts supplied and discard the old ones, even where an old item still looks serviceable; the kit is packaged as a complete replacement for what it covers
• While access is open, clean and inspect the mating parts that are not in the kit — new seals, gaskets or wearing parts fitted to a worn housing, shaft or face will not last
• Tighten, set and adjust to the figures given in the workshop manual for your engine, and renew any single-use fasteners or locking devices the kit provides

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21648630 → Supersedes 3593801 → Supersedes 30777476 → Supersedes 30650469

OEM / Related Numbers

• 3593801 earlier number superseded by this part
• 30650022 earlier number superseded by this part
• 30777476 earlier number superseded by this part
• 30650469 earlier number superseded by this part

📦 Condition

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