Home » Public Forums » GMCnet » 12pt inner drive bolt torque ( Was there a corrected value?)
| Re: [GMCnet] 12pt inner drive bolt torque [message #327887 is a reply to message #327884] |
Sat, 06 January 2018 11:52   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Emery, I know what the factory parts book says. You and Jim K. are correct.
There is only ONE length listed there.
I confused the 1 ton bolts with the stock ones. MANNY T furnishes
DIFFERENT LENGTH bolts with his kits. His bolts are a higher grade than the
OEM bolts, and engage all the threads present in the mounting flanges. On
the drivers side of the coach, the flange runs in very close proximity to
the final drive case. If the longer bolts are used there, the ends protrude
through the flange, and in some instances will hit the final drive case.
That is why the shorter bolts are provided. Sorry that I muddied the waters
here. Hope this explains my answer.
Jim Hupy
On Jan 6, 2018 9:33 AM, "Emery Stora" wrote:
> Jim Hupy — You are very positive in your reply but please show me anywhere
> it says they are different lengths.
>
> I have checked the maintenance manual and it doesn’t say anything about
> the length. It just says to use new bolts and torque them to 75 ft lbs.
>
> I checked the parts book 78Z and on page 1-9 it shows one side with part
> number 39477 on diagram 1.006. It doesn’t show the other side.
> The part number it gives is 39477.
>
> So I went to the assembly manual and it shows there are 12 bolts part
> number 39477 with torque of 60:75 ft lbs.
>
> Where do you find that they are of different lengths? I would trust that
> the assembly manual is correct.
>
> I have replaced mine perhaps three times over the years and the ones I
> installed were all the same length.
>
> So, I decided to call Jim Kanomata and ask him. Jim confirmed to me that
> both sides take the same length bolt.
> He says that the reason some people have seen different lengths is because
> someone has used non-GMC belts which were a bit longer Then they had to
> grind some off the driver’s side so they didm’t hit the final drive.
> But if you use 12 bolts all the same, but right, length they work fine.
>
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>
>> On Jan 6, 2018, at 9:24 AM, James Hupy wrote:
>>
>> No, they are not.
>> Jim Hupy
>> Salem, Or
>> 78 GMC ROYALE 403
>>
>> On Jan 6, 2018 8:02 AM, "Emery Stora" wrote:
>>
>>> I am fairly certain that they are all the same length.
>>>
>>> Emery Stora
>>> 77 Kingsley
>>> Frederick, CO
>>>
>>>> On Jan 6, 2018, at 8:52 AM, Steve Weinstock
>>> wrote:
>>>>
>>>> I have a vague recollection that the bolts on one side are slightly
>>> longer than on the other side...
>>>>
>>>> Correct ??
>>>>
>>>> Or do I have the wrong (too long) bolts on one half ??
>>>>
>>>> Thanks
>>>>
>>>> Steve W
>>>> Southern California
>>>> 1973 23'. Yellow
>>>>
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