I recently purchased a 1939 Buick Special model 41. The it had been owned by the previous owner for 55 years and always garaged. He had done all the maintenance including fairly recent engine rebuild. It drives nicely and is very enjoyable. Last weekend we decided to take it for its first shakedown cruise and drove 2 hours on nice secondary roads and it performed well. The transmission shifted nicely until 1 1/2 hours into the trip. Once things warmed up I noticed some grinding when I was shifting gears. I shifted slowly and most of the time it was OK, but as I neared home it would not shift without grinding. It acted like the clutch was not disengaging when I pressed the pedal. Even at a complete stop it would grind when I attempted to engage first or second gear. It would barely engage high gear when rolling along. By the time I got home the pedal height was quite low and it was difficult to drive. The car had not been on very many trips before I bought it and this was a chance for a shakedown cruise before deciding to attend and shows. I am wondering whether running it and getting it warm (engine temp was fine) may have caused a problem with the throw-out bearing. The linkage was adjusted exactly as it was when I started out, but it was failing to decouple the clutch. I am not sure whether the throw-out bearing was replaced when the engine was rebuilt, but because everything was fine prior to the drive I wonder if it may be the reason for the problem.
Has anyone had this happen and does this seem like a possible cause for my problem?
By the way the car is a lot of fun to drive and gets lots of looks. I am sure it is going to be a lot of fun showing and touring after this teething problem is taken care of.