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How to grease a throw out bearing
#1376949 Sun Sep 13 2020 11:53 PM
Joined: Jun 2020
Posts: 38
M
Wrench Fetcher
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

Re: How to grease a throw out bearing
Masterofnone #1376953 Mon Sep 14 2020 12:19 AM
Joined: Nov 2004
Posts: 1,832
J
Workshop Owner
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


J Lucas





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Re: How to grease a throw out bearing
Masterofnone #1376957 Mon Sep 14 2020 12:54 AM
Joined: Jan 2001
Posts: 5,023
P
Master Gabster


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Re: How to grease a throw out bearing
Masterofnone #1376962 Mon Sep 14 2020 01:43 AM
Joined: Jun 2020
Posts: 38
M
Wrench Fetcher
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?

Re: How to grease a throw out bearing
Masterofnone #1376979 Mon Sep 14 2020 03:58 AM
Joined: Apr 2002
Posts: 1,731
F
Fox Online
A teacher, but always an apprentice.
That’s pretty slick, Deve.

Last edited by Fox; Mon Sep 14 2020 03:59 AM.

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Re: How to grease a throw out bearing
Masterofnone #1376995 Mon Sep 14 2020 11:48 AM
Joined: Jun 2011
Posts: 3,630
E
Shop Shark
The labor to r and r a throwout bearing is so much more than the bearing cost, just get a new bearing.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: How to grease a throw out bearing
Masterofnone #1377104 Tue Sep 15 2020 03:21 AM
Joined: Jun 2020
Posts: 38
M
Wrench Fetcher
If you don't grease a throw out bearing, can anyone tell me why then the manual has you do it?

Re: How to grease a throw out bearing
Masterofnone #1377108 Tue Sep 15 2020 04:07 AM
Joined: Jul 2000
Posts: 1,038
G
Shop Clutterist
You apply grease to the groove where the fork fits.


Gord
----
1954 1/2 ton 235 4 speed
Re: How to grease a throw out bearing
Gord&Fran #1377207 Wed Sep 16 2020 12:52 AM
Joined: Jun 2020
Posts: 38
M
Wrench Fetcher
Originally Posted by Gord&Fran
You apply grease to the groove where the fork fits.

You are my hero! Thank you so much!

Re: How to grease a throw out bearing
Masterofnone #1377214 Wed Sep 16 2020 01:22 AM
Joined: Mar 2010
Posts: 9,443
5
Master Gabster
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.

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