C-Series Gearbox Problem.

[carbonboy]

Firstly, yes I've done a search & haven't been able to find anything to help me, so I'm turning it over to you all for help. :)

 

I just pulled the C40 4 speed manual out of my AE80 & replaced it with a C50/52 5 speed (not 100% sure which) & I am having issues with selecting gears. The clutch engages & disengages fine in the gears I can select, I don't think it would require bleeding as I didn't disconnect the line during the process?

 

The gearshifter will not move across to the left (looking down at the gearshift H-pattern) enough to engage 1st or 2nd with that shift cable connected, nor will it engage reverse when all the way to the right & pulled back. When the cable's disconnected the shifter does have the full range of movement though. The cable will physically not move enough to allow it, so I swapped the cables over to a set from a Twin Cam, same problem. I thought it may be the gearshift itself & swapped over to a Twin Cam item, still the same problem.

 

So from what I can tell, 3rd & 4th on the gearshift position is 1st & 2nd in the gearbox, while 5th & reverse on the gearshift position is 3rd & 4th in the gearbox.

 

Could I have bent a selector arm (where the cables connect to on the gearbox) somehow? Have I had something in the wrong postion when hooking the cables up? They can only be hooked up one way at the gearshifter & they don't cross over at any point, so are in correctly. Or could the gearbox be kaput? :(

 

Any help would be greatly appreciated! :yes:

Edited February 26, 2012 by carbonboy

[parrot]

Have you got enough master cylinder travel at the pedal? I recall having similiar issues when I swapped a 4AGE into the wife's AE82. Despite not touching anything clutch actuation wise during the conversion, I found I needed to adjust the clutch actuation rod into the master cylinder. Confused hell out of me at the time.

 

I also recall it was a prick to get at.

[carbonboy]

As in, enough travel to disenage the clutch fully? I can press the clutch in, select whatever forward gear it happens to be & let the clutch out as per normal.

 

Or is this something I need to play with at the master cylinder? Do you think a fluid bleed will help? Couldn't hurt I guess... :hmm:

[altezzaclub]

Go take the cable off & fiddle with the selector rods going into the gearbox, picking each gear one at a time & trying them. That will eliminate the clutch and the gearbox as problems.

 

Then all that is left are the selectors, and somehow the cable or arm distances must be incorrect. Are any of those joints adjustable? I've never worked on a FWD gearbox setup..

[carbonboy]

I had a theory that the bracket on the gearbox where the cables are secured before the selector arms might have had something to do with it(altering throw distance perhaps?), but from looking at the one on the C40, they're exactly the same.

 

Had a fiddle with the cables off, the selector arm doesn't seem to want to move fully into the position for 1st/2nd where the cable would be pushing it. Even with a gentle tap with a wooden block/hammer. So I'm guessing buggered gearbox. :hmm: