Date: Sun, 30 Apr 2017 23:25:47 -0600
Reply-To: Steve Williams <steve@WILLIAMSITCONSULTING.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Steve Williams <steve@WILLIAMSITCONSULTING.COM>
Subject: Re: Torque specs for wheel bearing housing (rear)
In-Reply-To: <CY1PR20MB00291726F798A60F1D33FA03A0140@CY1PR20MB0029.namprd20.prod.outlook.com>
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Hi,
First, I can't believe how obscure the torque reference is on Bentley
page 42.2. But it's there!
I use blue locktite on all my bicycle parts. I've never used Red
because it scares me because it's permanent :)
I guess for this application it makes sense. I sure don't want those
bolts ever coming loose accidentally!
In light of finding the spec on 42.2 of 101 ft lbs, if I did use
locktite, I'd torque it to 101 ft. lbs. That's close enough to the
calculations.
Using the numbers from Dennis's link (and his number) lubricated torque
is approximately 80% of the dry (for this specific bold).
101*.8 = 81
81*1.2 = 97.2... which is close enough to the 101.
Additionally, the Loctite literature says there is no torque adjustment
required.
So, Red Loctite or not? I just watched the video on the Loctite website
about using heat to remove the bolts in the future... It looks
reasonable given that even @ 300F, the strength is 50%. It's easy
enough to get the heat onto both ends of the bolt in the future, so I'm
leaning towards doing the locktite given how critical this assembly is
Thanks for everyone's input!
Cheers,
Steve W.
On 30/04/2017 6:18 PM, Dennis Haynes wrote:
> Here is a link to a very basic torque chart that will cover many non-specialized automotive fasteners.
>
> https://swtc.edu/Ag_Power/diesel_engines/lecture/Metric%20torque%20values.pdf
>
> If I recall correctly those bolts are M14, standard thread, and P.C. 10.9. So using this chart you would go for 165 ft. lbs. dry or 130 ft. lbs. lubricated. As I wouldn’t want these to come loose I would clean them well and use Loctite red. Since loctire can actually increase friction at the final torque I would use the lubricated value plus 20%, or 156 ft. lbs.
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Steve Williams
> Sent: Sunday, April 30, 2017 7:56 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Torque specs for wheel bearing housing (rear)
>
> Hi,
>
> I am trying to make sure I re-assemble my (rear) wheel bearing job 100% correctly as it does seem kind of important to keep the wheels on the vehicle :)
>
> I took the wheel bearing housing off the rear trailing arm to be able to clean it up well and to make it easier to get the darn retaining spring clip out.
>
> It took my impact wrench (560 ft lbs) with my air compressor cranked right up to get the 4 bolts off that connect the wheel bearing housing to the trailing arm.
>
> I went to check the torque specs for re-assembly and sadly, the Bentley doesn't have them that I can find. Looking at page 42.4, Diagram 42-619, it has the torque for everything but that.
>
> On page 46.6 it's shown again with the brakes, but no specs there either.
>
> I've tried to find it to no avail :(
>
> Does anyone have a pointer to where I can find this information?
>
> Thanks,
> Steve Williams
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