AW55-50/51SN Case Repair
The AW55-50&51SN / RE5F22A transmissions used in Volvos, Saturns, Maximas, and Saabs are spitting the planetary bushings out of the planets. One of the reasons this is happening is because of wear in the Aisin Warner cases. The bore for the outer race for the drive gear becomes worn and allows excessive movement in the gear train. See picture at right. We repair the case with a steel sleeve back to original dimensions.
With the lose of parallel between the shafts, the side loads on the bushings lead to bushing failure.
The picture on the right shows the transfer gear hub poised above the splineded are where the wear is. This hub is held in the case by a narrow snap ring that can be a real pain to get out.
Download Case Flyer
The front bell housing also sufferes from the "loose bearing bore syndrome". Be sure to check this important bearing position for wear. Click on Front Bearing Flyer link below to see picture.
Download Front Bell Housing Bearing Repair Flyer
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