The bearing fits over the shaft, but cannot be placed onto the shaft until the shaft has been shrunk (frozen) and the bearing expanded (heated). The BMW service manual gives exact temperatures for each part that must be attained for proper fit to occur. The old bearing was pressed off, but the new one (with the oven treatment) simply dropped into place. Once the temps of the two parts equalized they were inseperable by anything short of a press.
7 comments:
Blacksmithing trade secrets?
Bmw trade secrets.
Redneck trade secrets. My dad used to do this kind of thing with all manner of car (mostly VW, but also Ford) parts.
So... I don't get it. Please explain.
You freeze on part and bake another and the contraction (from cooling)of the inner one makes the expanded (from heating) outer one fit easily.
I just use my shop press. Its faster.
The bearing fits over the shaft, but cannot be placed onto the shaft until the shaft has been shrunk (frozen) and the bearing expanded (heated). The BMW service manual gives exact temperatures for each part that must be attained for proper fit to occur.
The old bearing was pressed off, but the new one (with the oven treatment) simply dropped into place. Once the temps of the two parts equalized they were inseperable by anything short of a press.
So oven mitts are a necessary part of the procedure? Gotcha.
But why are you swapping gears?
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