| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369232 is a reply to message #369230] |
Wed, 23 March 2022 17:14   |
James Hupy
Messages: 6806
Registered: May 2010
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The 1 ton is not assembled like the OEM front end. The outer CV joint
spline joint is an interference pressed fit. No clip. There is a spreader
tool, that Manny T. uses to install the boots without disassembling the
joint. It spreads open the shaft end boot large enough to fit over the
large outer end of the CV. To get to the boot, you need to remove the
caliper fasteners, remove the caliper and hang it so that it does not
stretch the brake hose. Then, take that big nut off the axle along with the
washer, and remove the rotor. That will give you access to the outer CV and
boot. If you cannot get the axle assembly free from the hub, then
disassemble the upper ball joint and that should give you enough space to
access the axle. I find it just about the same amount of work to just
remove the axle nut and washer, and the inboard CV flange bolts, remove the
axle and work on it in the bench. Any questions, PM me or call me.
Jim Hupy
Salem, Oregon
On Wed, Mar 23, 2022, 2:01 PM Richard wrote:
> Rob wrote on Tue, 22 March 2022 13:45
>> I had to replace both of my 1-Ton front end's (installed by Jim Hupy
> just before I bought the coach) outer boots - I think it was a combination
> of
>> the early hex head bolts (later versions had smooth carriage bolts?) and
> soft CV boot material (later ones were more "firm"?). They were both torn
>> with relatively few miles. Not a horrible job replacing them on a 1-Ton
> - but it seemed like the getting the angles just right was key to the
>> process. Dave Jarvis helped with the first one - and I did the other one
> the following season.
>>
>> I left the hex head bolts installed and used some different boots that
> came from Manny. I may have carriage bolts from Manny as well - but figured
>> "why mess with it?", if things are OK with the new boots. I've got many
> thousands of miles on the second set of boots.
>
> Rob,
> I'm not following you...maybe we're not talking about the same thing? I
> was asking if anyone was able to release the shaft from the outer CV joint
> and replace the outer boot without disturbing the 6 12-point output shaft
> bolts or the big axle nut at the hub.
>
> I'm not familiar with the carriage bolts you mentioned, where do they go?
> Mine wasn't a kit so maybe that's the difference?
>
> Jim,
> I've heard the suggestion to not tightly band the small ends of the CV
> boots, but I don't think twisting is what's causing boot failure. There's
> not
> much slop between the CV ball bearings and the bell housings unless
> there's a lot of wear. The twisting couldn't be more than 1° or 2° while
> the
> flexure from suspension travel is multiples of that. In either situation
> a looser small band would allow the boot to move to minimize stress, and not
> a bad idea. Still think it's just crappy rubber causing the problem!
>
> All,
> Has anyone tried Bob Drewes technique for releasing the outer CV joint to
> replace the boot? If not, I'm kind of shocked. When I first got into the
> GMC world I spoke to all of the GMC gurus, and whenever they didn't have
> an answer I'd almost always hear, "Ask Bob Drewes." Please chime in if you
> tried Bob's technique and let me know if it was successful or not.
>
> I know of one other person who tried Bob's technique without success.
> After I removed my 1 ton axle assembly and found the axle wouldn't budge
> after
> the snap ring was released, Ernie suggested a come-along to pull the axle
> shaft out of the outer CV. After replacing badly worn inner CVs on both 1
> ton half shafts, and running out of curses, I'm of the opinion 1 ton store
> bought axles have so much variance in all of their parts that the
> specifications are only really suggestions. More on this later.
>
> Richard
> --
> '77 Birchaven TZE...777;
> '76 Palm Beach under construction;
> ‘76 Edgemonte waiting its turn
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