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Kruh wrote:Also, I've heard that the standards back then in DDR weren't the same as the ones today. So a C4 bearing back then is equivalent to a modern C3. Maybe someone can confirm this? Seems likely.
C3's should also be considered in the gearbox where the manual specifies C4f's. The extra clearance should reduce the chance of jamming.
Puffs wrote:I wasn't sure when that 1:50 recommendation came, so I browsed some more in manuals: for the ES they still recommended 1:33, and changed that to 1:50 for the earlier TS (engine: MM250/3), which incidentally still lubed the main bearings with gear oil. Also interesting to see that for both those engines they specify "6305 c 003 f (geräuscharm)" as main bearings, for both. So those are C3's, 25x62x17, while for the later MM 250/4, where lubrication of the main bearings was done by premix, the recommendation changed to the 6306 C4f.
At least that's the recommendation in German, the English manual says 6304 C4f, which is odd, as 6304's are just 20x52x15, while the 6306 ones are 30x72x19. Apparently bearings shrink when translated to English, which is of course quite a frightening process.
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