Home » Public Forums » GMCnet » Bob Drewes' outer CV boot replacement technique
| [GMCnet] Re: Bob Drewes' outer CV boot replacement technique [message #369233 is a reply to message #369205] |
Wed, 23 March 2022 17:18  |
James Hupy
Messages: 6806
Registered: May 2010
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Oh yes, if I have complete axle assemblies in stock, I usually just swap
whole assemblies rather than screwing around trying to disassemble those
interference fit buggers. But, most of you do not have that luxury, I know.
Jim Hupy
Salem, Oregon
On Wed, Mar 23, 2022, 3:14 PM James Hupy wrote:
> 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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