Alfredo Contaldo · video

What this video covers

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

Boats in this video

More from Alfredo Contaldo

How to pass the chartwork exam for the boating license beyond 12 miles in 2026Jun 2026Propeller Shaft Bushing Replacement - 3-Blade Folding Propeller and Zincs 🛠 Onboard Work ⛵May 2026What is a SELF-TACKING JIB ⛵ Pros and Cons and how it works on a sailboat ⛵Apr 2026Can multitools and Swiss Army knives still be used after the "anti-maranza" decree?Mar 2026

From Alfredo Contaldo — see the channel’s boat, crew, and every analyzed video.