The problem was not the case bearings, it was the big end rod bearing...It should be OK for a long time...It was made a little loose and got worse with age...There's more than a normal amount of play when you rotate the crank...The Sachs crank fits perfectly it it ever goes bad...I saw only one broken crank, it was on a big twin in a P51 race plane....The singles just got too loose to run right...I still a few 4.2 and a 5.8 crank here, no 3.2...