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A change made to the gearbox oil level was announced in the Technical Bulletin No. 56 from January 1955, or to be more precise, from engine no. 4000 on.
As the most engine/gearbox units got mixed up by last 40 years repairing and restoring measures, we would recommend to check the level marks in accordance with the sketch shown on the left, and to add a new mark if necessary.
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