A new customer with a 1969 280 SL/8 Pagoda arrived at the garage from Surrey with a heavy knock and vibration from the engine but otherwise running OK. On dismantling the engine the fault became very apparent the crankshaft had sheared on the web adjacent to number four crankshaft journal, not a very common occurrence on the M130E engine. With further investigation the cause of the crankshaft failure was due to number four crankshaft shell bearings excessively worn, which allowed the crankshaft to oscillate at high revolutions, causing undue stress on the crankshaft which in turn caused it to shear.

With a new Mercedes-Benz crankshaft and bearings fitted, machined and re-assembled the engine was tested, tuned and returned to the owner.