The Stovebolt Site Forums The Shop Area Driveline How to grease a throw out bearing

Have a 65 Chevy C10 with a NP435 out of a 68 GMC. What's the proper procedure for greasing a throw out bearing that has no zerk?

Bobby

I believe all throw out bearings are sealed bearings and cannot be greased. I've always just replaced them when installing a new clutch. It's possible that someone on here has found a way to repack them with grease, but I've never tried to, or heard of anyone doing it.

John

Well okay then let me ask you this...

In the original 1963 C-10 Shop manual, it shows that there was a grease cup on the bell housing that runs down to the output shaft via a rubber hose and this cup should be greased every 6000 miles. The 68 has no such cup (and I don't remember one on my SM420....)

My 1981 international has a zerk you can get to via an inspection cover under the transmission in the area of the output shaft.

So perhaps it's not the actual throw out bearing I'm applying lube to, but the output shaft? Would you need to lube where the fork attaches to the throw out bearing?

That’s pretty slick, Deve.

The labor to r and r a throwout bearing is so much more than the bearing cost, just get a new bearing.

Ed

If you don't grease a throw out bearing, can anyone tell me why then the manual has you do it?

You apply grease to the groove where the fork fits.

You are my hero! Thank you so much!

You also grease the recess area in the middle of the center of the bearing assembly where it rides on the tube which extends around the input shaft of the transmission.
This recess is very shallow and only needs a small amount of grease. Too much grease here will bleed out and contaminate the clutch disc.

Here's a picture to show what we are talking about. (page is from a 1979 manual but it's much the same)
http://oldcarmanualproject.com/manuals/GMC/1979/LTService/07C/images/79GMCService0815_jpg.jpg

There is a seal at the back of some release bearings. Use a pick to carefully remove the seal and add grease. Not all release bearings will have a seal. New release bearings often have too little grease because the overseas production tries to save money by skimping. Here's a photo I have on file and you can see the seal.

Okay great things is exactly the information I need.

The truck had a turbo 350 in it and I always hated it. I converted back to stick but now I'm having trouble finding guys that can teach AND know what they're talking about! Fortunately there's plenty of you in this forum but I don't always know the right questions to ask.

The picture in the 63 manual was not as good, thank you!