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Removing and servicing the heat exchanger and exhaust riser on a Volvo Penta D2-55 engine requires draining the coolant, disconnecting electrical components, and extracting the tube bundle for cleaning. On a Bavaria Yachts 44, the process begins by closing the raw water intake and draining the engine coolant through the heat exchanger drain plug.▶ 3:37 After removing the air filter and the MDI control unit to gain access, the exhaust riser is unbolted from the manifold.▶ 7:03 The heat exchanger is then detached from the engine block by loosening its mounting bolts in a gradual, sequential pattern to protect the gaskets.▶ 8:17 Once removed, the end caps are unscrewed to expose the tube bundle, which is extracted using a rubber-handled tool to avoid damage.▶ 10:57 Clogged tubes are cleared by soaking the bundle in a vinegar solution for 24 hours.▶ 11:50 During reassembly, all O-rings and gaskets must be replaced, and a torque wrench should be used to ensure proper bolt tension.▶ 12:37

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