Epiphany Sailingvideo
Replaced exhaust mixing elbow Universal Diesel M-25 on our C&C 39 Sailboat
December 24, 2024 · 2 min · 699 views
What this video covers
The exhaust mixing elbow on a Universal Diesel M-25 engine aboard the C&C 39 *Epiphany* rotted through at the flange — a common failure point where the elbow joins the exhaust manifold.0:44 The underside of the flange had cracked nearly all the way through, though the manifold flange itself was undamaged.1:27 The original elbow was likely never replaced; the engine was rebuilt seven years earlier but the elbow appears to predate that rebuild.0:58 A replacement elbow cost $155 including gasket and clamp.1:12 Removal required a pipe wrench and a torch on standby, with a grinder as a fallback to cut the casting free if the threads seized — but the elbow broke loose without heat, leaving the threads intact for reuse.2:09 The new elbow is slightly larger than the original, requiring an adapter to reconnect the saltwater cooling circuit.1:34 Installation completed without further complication.2:19 On a Universal M-25, inspecting the mixing elbow's underside flange — not just the visible face — catches this failure before the elbow breaks off entirely.
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