As a newly aspiring diesel mechanic, this is a pretty good thing to have to fix. On the Yanmar 3QM30FG the elbow screws into a flange which bolts onto the exhaust manifold. Just unscrew it and pop a new one in, right? I took the hose off and tried to turn the elbow but it wouldn't budge. So I unbolted the flange and took the whole thing off as a unit. The new exhaust elbow was about $180. The flange was in good shape and a replacement is $90, so I was pretty determined to reuse the flange. It took a vise, lots of PB Blaster, and some creative application of leverage but I finally got them separated. A fresh coat of Yanmar Gray and it looked like new!
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