| Rear spindle nut tightening specs [message #140524] |
Mon, 22 August 2011 19:28  |
 |
RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
|
Senior Member |
|
|
I'm looking for the method of setting the rear spindle nuts. All I can find in the manual is on page 5-46 of the brake section where it says 25-30ft lbs. I think that is too much.
I thought you bring it up to so much then back it off to the first castellated slot.
can anyone point me in the right direction.
Thanks
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
|
|
|
|
| Re: Rear spindle nut tightening specs [message #140527 is a reply to message #140524] |
Mon, 22 August 2011 19:36  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
|
Senior Member |
|
|
| RF_Burns wrote on Mon, 22 August 2011 20:28 |
I'm looking for the method of setting the rear spindle nuts. All I can find in the manual is on page 5-46 of the brake section where it says 25-30ft lbs. I think that is too much.
I thought you bring it up to so much then back it off to the first castellated slot.
can anyone point me in the right direction.
Thanks
|
Sir, tighten to spec to seat bearings, loosen, retighten finger tight then back to first hole the pin will go in, there are two holes and end up being 1/2 slot apart.
C. Boyd
76 Crestmont
East Tennessee
|
|
|
|
|
|
| Re: Rear spindle nut tightening specs [message #140532 is a reply to message #140528] |
Mon, 22 August 2011 19:41 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
|
Senior Member |
|
|
| RF_Burns wrote on Mon, 22 August 2011 20:39 |
Thanks for the quick reply Sir!
Now I can finish before its gets way too dark.
|
Better hurray, its already dark here.
C. Boyd
76 Crestmont
East Tennessee
|
|
|
|
|
|
|
|
|
|
| Re: Rear spindle nut tightening specs [message #140593 is a reply to message #140524] |
Tue, 23 August 2011 07:44 |
|
RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
|
Senior Member |
|
|
Gene, Not sure why I didn't think of your site!
Ken, from Gene's site I read your message:
| Quote: |
But here's the exact instruction from X-7525:
"and hubs on spindle. Tighten castilated nut (figure 17) to 25-30 ft . lbs., back nut off one half turn and then finger tighten until cotter pin can be installed."
Assuming the spindle threads are 16 tpi, that's 1/2*1/16-1/6*1/16=0.021" axial clearance (plus whatever slop comes from grease interference, etc.);
I'd rather see <0.010" -- and even less with my disc brakes. Many references I've seen recommend 0.001"-0.005", but I think anything <0.005"
is risky.JMHOKen Henderson
|
When I had the tires balanced the tire guy pointed out that the back rear passenger wheel bearing had some play in it. I had the rear bearings checked and packed (can't remember if any or all were replaced) by a GMC knowledgeable garage 2 years (4,000 miles) ago.
The local fleet service place I use is next door to the tire guy so he came over and redid the spindle nut. He wasn't happy since it didn't seem any better. He was having problems with the cotter pin and I was sure it ended up back at the same setting so I thought I would take a stab at it.
I can only seem to get a cotter pin into one hole so its either too loose (can hear and feel the slop) or snug finger tight. When I say snug finger tight, I mean I can't tighten it any more with my fingers at that point but I can get the cotter pin in there. I'm thinking it since its still finger tight it should be Ok and not too tight, and certainly better than loose.
I can't use the second hole as it seems to partially blocked by the nut and I don't want to goto a smaller cotter pin as the size that will fit is way small.
Would you think I'm ok?
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
|
|
|
|
| Re: Rear spindle nut tightening specs [message #140602 is a reply to message #140593] |
Tue, 23 August 2011 08:14 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
Take the nut off and chase out the blocked hole with a drill. I'm afraid of you getting it too tight and ruining a bearing and spindle. Loose is better than tight.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] Rear spindle nut tightening specs [message #140603 is a reply to message #140593] |
Tue, 23 August 2011 08:16 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
|
|
Bruce,
First off, when dealing with tapered roller bearings, too loose is always
better than too tight.
Since we have no way to know how tight "finger tight" is, I'd either make
that 2nd hole work (modify the nut a bit?) or put a dial indicator on it and
see how much radial play I had.
If unable to do either of those, I'd back off to that "too loose" setting
until I could find out why it's too loose. The results of too tight are
catastrophic; the results of too loose are comparatively insignificant.
JWID,
Ken H.
On Tue, Aug 23, 2011 at 8:44 AM, Bruce Hislop <bruce@perthcomm.com> wrote:
>
>
> Gene, Not sure why I didn't think of your site!
>
> Ken, from Gene's site I read your message:
> Quote:
> > But here's the exact instruction from X-7525:
> >
> > "and hubs on spindle. Tighten castilated nut (figure 17) to 25-30 ft .
> lbs., back nut off one half turn and then finger tighten until cotter pin
> can be installed."
> >
> > Assuming the spindle threads are 16 tpi, that's 1/2*1/16-1/6*1/16=0.021"
> axial clearance (plus whatever slop comes from grease interference, etc.);
> > I'd rather see <0.010" -- and even less with my disc brakes. Many
> references I've seen recommend 0.001"-0.005", but I think anything <0.005"
> > is risky.JMHOKen Henderson
>
>
> When I had the tires balanced the tire guy pointed out that the back rear
> passenger wheel bearing had some play in it. I had the rear bearings
> checked and packed (can't remember if any or all were replaced) by a GMC
> knowledgeable garage 2 years (4,000 miles) ago.
>
> The local fleet service place I use is next door to the tire guy so he came
> over and redid the spindle nut. He wasn't happy since it didn't seem any
> better. He was having problems with the cotter pin and I was sure it ended
> up back at the same setting so I thought I would take a stab at it.
>
> I can only seem to get a cotter pin into one hole so its either too loose
> (can hear and feel the slop) or snug finger tight. When I say snug finger
> tight, I mean I can't tighten it any more with my fingers at that point but
> I can get the cotter pin in there. I'm thinking it since its still finger
> tight it should be Ok and not too tight, and certainly better than loose.
>
> I can't use the second hole as it seems to partially blocked by the nut and
> I don't want to goto a smaller cotter pin as the size that will fit is way
> small.
>
> Would you think I'm ok?
>
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
|
|
|
|
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
