4106 Rear Main, Clutch, & Input Shaft *Pictures!*

[OneLapper]

For your entertainment!

I pulled the tranny off the engine from the scraped bus.  650 miles into the 850 ride home, the rear main seal went in a big way. Note the two broken flywheel bolts.  What would cause the bolts heads to snap off?



One of the two clutch disks was completely broken into pieces, but the clutch components were all new!  All of the parts spec'd out like new! A few hours of parts washer time and clean up with a metal block and emery cloth used to determine if they can be reused.

This is outer disk:


With the pressure plate removed.  The hub broke free from the friction plates:


You can see some of the broken hub springs stuck in the pressure plate:


Here are the heads to the flywheel bolts that snapped off for some unknown reason:


And the input shaft on the transmission.  Ugly.  The shaft on my tranny must be relatively new because it's perfect. I was hoping to use this transmission because it has less miles on it.  


And just for laughs, I took apart the pressure plate that was on my bus.  It was assembled with three springs missing!  Was this a old-timers trick to reducing clutch pedal effort or did he lose a spring and remove the other two to make it balanced?? We'll never know!


Anyone replace an input shaft on a four speed Spicer?

[momentum]

Hey, did you ever swap this shaft over? I have a spicer with a lot of slop in the input shaft and I think the bearings and maybe the bevel gear are shot. I have yet to pull it apart. I'm looking for parts...

[Jim Blackwood]

Could be that the flywheel bolts were over-torqued. I've seen that happen.

Jim

[Utahclaimjumper]

 The rear main seal was put in backwards.  So it's a safe bet the rest of the work was substandard also.
I have also found the alignment pins are not always aligned properly,,so if the flywheel won't slide on easily, you have to rotate it 180 degrees.. If you don't the, flywheel bolts will be torqued with a side load and fail.>>>Dan

[chessie4905]

I've seen pressure plates that way before. Springs were tailored that way for sufficient pedal pressure for application. In a truck, it would probably have springs in all positions.

[gmnut55]

Pm me at gmnut55@hotmail.com, I can set you up with everything you need, new and used . Have lots of parts for 4104 and 4106 parts. Mark