Giving exhaust problems the elbow

Ian Pirrie explains how to check the condition of the exhaust elbow on Yanmar GM engines

Great ideas and tips from PBO readers Email your projects and tips to pbo@ipcmedia.com or write to us at the address at the top of page 5. We pay at least £30 for each one published Yanmar GM engines are common and reliable, but one weakness on the rawwater-cooled version is the exhaust elbow, where seawater is forced into the elbow at the engine manifold. Problems occur when hot exhaust gases are mixed with seawater: this is a very corrosive mixture. The elbow has a concentric tube welded inside the outer tube, which forms a water-cooled jacket around the exhaust passage: this weld is very prone to failure. Regular examination and replacement of the elbow is necessary to prevent major engine damage. Failure of the weld at the join of the inner and outer…

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Practical Boat Owner (Digital) - 1 Issue, June 2015

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