Join Date: May 2014
Location: San Andreas Fault Zone
Mentioned: 130 Post(s)
Tagged: 0 Thread(s)
Quoted: 1341 Post(s)
Re: Do the Manual FJs have chance of self destruction.
The 6-speed manual transmission (RA61F) used in the FJ has a design weakness relating to the support of the clutch throw-out bearing. The bearing slides on an aluminum tube that is an integral part of the front half of the transmission housing.
In some cases the OD of this tube has become severely worn or galled, which in turn triggered problems with the TO bearing. It's not clear why some MT FJs encounter this problem, and others do not.
Correcting the problem entails either:
1. Replacing the transmission housing, which requires a lot of very close-tolerance measurements to get the end play of all the transmission shafts set via selection of the appropriate shims. This might not be a permanent solution, depending on the factors that caused the original wear or galling condition. Because of the level of skill, and the time required to make accurate measurements, many dealers will not replace the transmission housing, but opt to simply replace the entire transmission.
2. Install a thin-walled stainless-steel sleeve over the aluminum tube, providing a hard, smooth surface for the TO bearing to slide on. This fix requires the use of an aftermarket TO bearing with a larger bore that will accept the larger OD of the sleeve.
Last edited by FJtest; 09-12-2017 at 06:27 AM.