replaced Dual mass Flywheel, question.

[Trickle X]

Hey guys, I picked up a 2006 with the g56 transmission. Occording to the guy I bought it off of, he said it still had the stock clutch in it at 240k. I find that hard to believe, but it had the nasty vibrations at idle. So I called up SBC and ordered a single disk/flywheel and hyd setup. The G56 is new to me, but not dual mass flywheels. I pulled the transmission out on saturday and removed the pressure plate and clutch disc. I could not believe how bad of shape the pressure plate was in. One of the fingers was missing(found it) and another was about ready to let loose. The DMF had completely failed but for some reason it still worked. I took lots of pictures of it and I can't believe you could even shift through the gears.



Anyways, I intall the SBC flywheel, disk, & pressure plate. I replaced the throwout bearing all with no issues. I didnt check the input shaft, but while putting it all back in, I noticed that the input shaft had some side to side play. I know this isnt good, but it all lined up and when together ok. I didnt get a chance to replace the hdy system yet, but I did drive it. On the stock hyd system the pedal pressure is very weak. I am going to replace the hyd system this week. On the stock hyd system it barely wants to disengauge the clutch and hangs a lil until I pump the clutch. Once rolling it works ok, but you can feel it still hanging a lil. I just needed to get it home from where I did the clutch job, since I didnt feel like doing it in the rain on saturday.



My question is this, what issues will i run into with the slop in the input shaft? Is it the input bearing, or is my transmisson casing worn to the point that no matter what I will need a new g56. Will I destroy the pilot bearing in short order? This isnt a daily driver, so it sits most of the time. I just need it to tow a few times a year. I am just trying to figure out what I want to do down the road, if I should keep my eye open for a used g56 or just plan on rebuilding the gearbox.



Thanks!

 

[HBarlow]

If a TDR member knowledgeable on the internals of G-56 transmissions does not respond to your question try calling Standard Transmission and Gear in Ft. Worth, TX. They are a TDR advertiser and a highly skilled transmission rebuilder. They will know.

I'm not knowledgeable but I would worry that with the aluminum case that pilot shaft wobble might take out the front of the case if neglected for very long.

 

[Joseph Donnelly]

Your G56 case and bearings (at the front of the case, and between the input and the mainshaft) are probably worn. The pilot bearing in the flywheel will get extra load because of that. At some point, you will have to rebuild the G56 at a shop such as Standard Transmission in Fort Worth (800-std-tran, Standard Transmissions & Parts: Tremec - Borg Warner - New Venture - Getrag, Cummins, 4 speed transmission, 5 speed transmission, 6 speed transmission )

 

[seafish]

I am going to be replacing my DMF clutch soon with the SBC ConOFE that I won here on TDR--
Is there a specific method and tolerances for checking input shaft play on the G56 ??

 

[CKelley1]

we were luckey enough to catch our dmf's early enough that they did not cause the harm to the input shaft bearing, but we did have to replace the shaft seal. remember you need to fill the g56 one quart over full.