8 3/4 QUESTION #2

[CFD244]

Hi Folks

So, I've removed the pinion nut, yoke and seal and I want to clean the front pinion bearing of the crud that got in there when pulling pulling the seal. The book says that the front bearing should just drop out when inverted.......It doesn't.

I have tried prying up on it with a couple of screwdrivers and no go.

So, am I going to have to pull the carrier in order to press the pinion shaft out to get this bearing off, or is there a trade secret out there that would help? I really didn't want to dick around with those adjusters putting it back together.

The unit is a 1971 sure-grip with a 741 case and 3.23 gears.

Thanks

 

[george joseph reid]

Spray it with PB or what you got. Thread the pinion nut on a bit and GENTLY smack it with a dead blow or brass drift and a small hammer. After years of use they stick from grease ect. A small amount of heat wont hurt. Other than that tear it out.

 

[SGBARRACUDA]

Pulling the carrier would be the correct way so that you can inspect both pinion bearings and both carrier bearings. The front smaller bearing can be removed but it is easy to **** it little bit therefore jamming the bearing.

 

[MoparLeo]

Follow the Factory Service manual instructions. Download one if you don't already have one.
.

 

[CFD244]

Follow the Factory Service manual instructions. Download one if you don't already have one.
.

I did that. The manual says invert it and catch the bearing in your hand.......It's a no go.

 

[MoparLeo]

You have the yoke, seal and washer removed ?

 

[CFD244]

You have the yoke, seal and washer removed ?

Correct.

 

[MoparLeo]

So only the back side if the bearing is visible?

 

[CFD244]

So only the back side if the bearing is visible?

Correct.

 

[MoparLeo]

Have you tapped on the threaded end of the pinion gear with a plastic or brass hammer ?

 

[CFD244]

Have you tapped on the threaded end of the pinion gear with a plastic or brass hammer ?

Yes. Hit the cast while inverted with a soft face dead blow hammer as well.

 

[MoparLeo]

If it is still stuck ?? plan on at least replacing the bearings and races. If you haven't done this before and are not comfortable with going any farther ( point of no return) find a driveline/ transmission repair shop in the area and just btake the pumpkin down to them. Shouldn't be very expensive if the gears are not damaged.

 

[CFD244]

Thanks for the input. Everything looks awesome inside. Nothing is seized, I just wanted to rinse out the bearing after pulling the seal.

 

[CFD244]

Pulling the carrier would be the correct way so that you can inspect both pinion bearings and both carrier bearings. The front smaller bearing can be removed but it is easy to **** it little bit therefore jamming the bearing.

What is the probability that I could pull the carrier and pinion shaft and put all the stuff back together the way they came out without using specialized tools and checking the contact pattern with gear bluing?

 

[SGBARRACUDA]

What is the probability that I could pull the carrier and pinion shaft and put all the stuff back together the way they came out without using specialized tools and checking the contact pattern with gear bluing?

The pinion preload is easy, reinstall it the same way you took it out. If it was right before it will be right after. The carrier is another thing. If I'm taking apart a third member that was quiet before than I want to check the backlash before I take it apart so that I can put it back with the same BL. Without a dial indicator, this will be tough.

 

[CFD244]

The pinion preload is easy, reinstall it the same way you took it out. If it was right before it will be right after. The carrier is another thing. If I'm taking apart a third member that was quiet before than I want to check the backlash before I take it apart so that I can put it back with the same BL. Without a dial indicator, this will be tough.

Thanks Roy. A dial indicator I've got. In my manual, it shows a bunch of specialty tools that I don't have.

 

[MoparLeo]

Also experience isn't sold in a book...

 

[CFD244]

Also experience isn't sold in a book...

I start with the book, battle through it hands on, then I have experience. Just trying to skip the "battle through it stage". Sometime you have to break stuff to figure it out.

 

[George Jets]

Take a shop vacuum with the large hose and set up at the front grease seal area, could even duct tape it on to the yoke area of the 8 3/4.

Then pull the Fill Plug, this will allow air flow through the 741 case and out through the front bearing with the vacuum turned on.

Step 2, rotate the gears back and fourth to help the vacuum pullout any stuck particles.

Step 3, can spritz the front bearing with a little diesel fuel, suck that back out the front and use high pressure air through the fill hole to help push eveything out the front to the vacuum.

Step 4, rotate the gears with the yoke lightly stuck on so you can feel for the bearing smoothness as you rotate it by hand to make sure it feels clean.

Step 5, drip in a little gear lube to the front bearing and blow it back into the case to lube the front bearing after cleaning. Rotate again with the yoke again for final test OK, then degrease the seal area, pop in the new seal, put on the bearing washer and yoke.

Good to go, all done without pulling the carrier.

The front bearing has a drain chanel that runs to the sump of the chunk, where small debris collects and sits there over the years. Same as the engine gunk that sits down in the bottom of a well used engine's oil pan.