So I am trying to put the balance shaft in right now and noticed there is a gap at the end opposite to where the gear is (see figure 1a). I checked the FSM and it says I need to have a "balance shaft bushing" in that spot (see figure 2), but I can't seem to find it (I have a feeling the machine shop took it by accident).
When I went to the dealership to replace it, their computer catalog makes no mention of a bushing and I didn't have my manual with me at the time so I pretty much looked like an idiot. The GM catalog only seems to have a $17 "balance shaft bearing."
Now my question is, are the bushing and bearing the same thing? Or is the bearing what goes at the end of the balance shaft (see figure 1b)?
I tried to do some research online to see what it looks like but I could only find this thread from the midwest 3800
board about doing a balance shaft deletion and they have this picture (figure 3) but I'm not sure which is which and what goes inside what.
My last question is, when I put the balance shaft in, should the driven gear completely overlap with the drive gear on the cam shaft (see figure 1c)? I couldn't really get it to go all the way by hand so I am assuming I need to take a soft mallet to it? Thanks a lot for clearing up my confusion, I just want to do this rebuild right!
a. rear of engine, where supposed bushing (bearing?) is missing
b. what my balance shaft looks like, not sure if thing on the rear is actually the bearing or if it is some kind of machined bearing permanently attached to the shaft
c. front of engine, not sure how far in the balance shaft should go
Figure 2: Part 43 reads balance shaft rear bushing, taken from 3800 pro forums
Figure 3: not sure what these are, taken from midwest 3800 forum