ENGINE FAILURE: Testing the Compression & Pulling The Engine On a Sailboat in Opua New Zealand

Name: ENGINE FAILURE: Testing the Compression & Pulling The Engine On a Sailboat in Opua New Zealand
Uploaded: 2023-06-19T13:03:16.000Z
Duration: 15 min 9 s
Description: A mechanic tests compression on a Yanmar 2GM20 engine aboard the 30-ft sailboat Triteia in Opua, New Zealand.

19. juni 2023 · 15 min · 31K visninger · Opua, Bay of Islands

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A mechanic from J&B Marine in Opua, New Zealand, diagnosed low compression in the Yanmar 2GM20 engine of a 1965 Alberg 30, Triteia.1:24 Compression tests revealed 220 psi in the aft cylinder and 100 psi in the forward cylinder, significantly below the factory specification of 380 psi.5:29 Seawater intrusion caused the failure, necessitating a full engine removal for a rebuild or potential cylinder boring.8:29 To avoid high marina slip fees and insurance requirements, the owner removed the engine block using a makeshift timber gantry and a borrowed come-along.9:28 With the engine out, the owner maneuvered the boat from the marina slip to a nearby anchorage using a dinghy lashed to the hip as an auxiliary motor.11:51 The vessel now sits in shallow water over a mud bottom, awaiting the engine shop's assessment of the head and cylinder condition.13:47 Professional compression testing confirms internal engine damage when troubleshooting persistent starting issues and low power.