clutch adjustment on MC-9 with air assist

[Brian R.]

   I have a 1983 MC-9 engine and trans (6v92 w/ Fuller 11605)  that I recently put into my MC-2. The problem is the clutch adjustment. The air assist is similar to the setup on a MC-5 but is different,(I have a 5 manual).  The only MC-9 manual I have found is dated 1989 and shows no air assist. Is there an earlier manual for the MC-9 ??  What year is the manual that BCM sells for the MC-9 ??

   Ok, so the problem is this. You need the air assist and the lever it connects to to be in a straight line when clutch fully engaged. I have tried this, and a little above and below a straight alignment. No matter where I put it, after depressing the clutch it doesn't return fully to its starting position thus leaving it in contact with the TO bearing. The short lever with the bolt for adjusting the freeplay is pushed back by the pressure plate springs only to that point. And there is an annoying "hitch" (like going over center) when beginning to depress the clutch.

   (Just for the record I have gone thru all the bushings, connections, and heim joints...no slop.)( even replaced the crosshaft and its bushings)

   Increasing or decreasing the air pressure via the regulator hasn't helped matters. I have added a spring for return but it makes the clutch that much harder to depress. Increasing air pressure to combat this doesn't help as the spring is then fighting the increased air pressure.  What's a fella to do ? I know..."get an automatic". I don't want to lose the TO bearing and I would like a smooth clutch.

   I think it was Brian Evans who maybe had similar problems with his MC-5 and I think that after many years he gave up on it and was going to get an automatic, but I couldn't find that post again.  Well, if anyone can shed a little light on this that would be greatly appreciated.....Brian R.

[Dreadnought]

Slightly off topic but what linkage did you use for the fuller T0-11605 trans? That's the trans id like to use on mine (rebuilding as a c variant with over drive). I understand that between the original spicer 8245/8844 and the fuller, one has a dual linkage and the other a single but I don't remember which.

[Brian R.]

   I don't know much about dual linkage but I'll tell you what I have. The MC-9(w/ 11605) had a single rod front to rear for shifting, as does my MC-2.  MC-9 also has a single rod front to rear for clutch, as does my MC-2.  Looking in the MC-5A maintanence manual that I have, they list the transmission as a 8245-D and say "Two rails in the base of the (drivers) shift tower are connected to two control rods which are linked to two control arms of the transmission".  I don't know about the 8844. So maybe that is the answer to your question.  Good luck...Brian R.

[Dreadnought]

Thank you so much Brian R

[Brian R.]

   Does anyone out there have a TMC-MC9 with the Fuller 11605 trans with an air assist on the clutch ?  If so, does the clutch work reasonably well and smoothly, and are you sure the TO bearing is not riding ?  And what maintenance manual do you have that covers the clutch info. The eng/trans I have is from a 1983 TMC-MC-9. The 1989 Manual has nothing in it about the air assist despite it covering the11605.  Any thoughts....Brian R.