I'm glad you saved yourself some unnecessary work. Send some of your good luck my way!
CV joint ripped boot
- Thread starter boybach
- Start date
Interesting. I think I've been looking at this from the wrong angle. First off, the torque specification.Back to an earlier unanswered question: the effect of Loctite.
Well, there is some sort of consensus that "the Loctite people recommend 20% reduction in torque spec", or others that say there's no effect. A snippet from their threadlocking guide:
View attachment 18292
This acknowledges a lubricating effect, but contradictorily says no on-torque adjustments needed. Clear as mud.
Here's one Allis Chalmers forum thread where a member reportedly wrote to Henkel and received a response. In summary, they acknowledge there is an effect, but claim it is small compared to the overall variance in the K factor. As such, they provide no data or rule of thumb anymore, but are willing to do lab tests for you (for a nominal fee, I'm sure).
Torque adjustment for Loctite
I've seen several postings stating torque should be reduced by 20% per Loctite. It sounded a bit...www.allischalmers.com
As listed in an earlier post the Toronado torque spec for the inner CV to output shaft bolts was 65 ft-lbs. It turns out that the 1973 X7425 maintenance manual for the TZE, one that I had never seen, had the same 65 ft-lbs spec and did instruct to use NEW bolts when reassembling. The 'NEW' could only mean they knew they were pushing the limits of the bolts from the beginning. Increasing the torque specification could only mean that 65 ft-lbs wasn't doing it. I'm not aware of a recall or service bulletin, so the problem wasn't catastrophic - the bolts were loosening. This
confirms it.
The later ubiquitous maintenance manual X7525 upped the torque to 75 ft-lbs and also required NEW bolts but no longer mentions the inboard flange bolts loosening in the Troubleshooting section. It seems like GM thought they had solved the problem.
What changed was clamping force (friction) and bolt deformation. Your guess is as good as mine which is doing the driving.
Then the Loctite & bolt lubrication got me thinking - when did Loctite find its way into the assembly line and into other vehicles' maintenance manuals? So I looked into it a bit. Loctite was patented in the 1950's but GM didn't start using it in production until the late 70's early 80's. It was specified for high vibration assemblies such as drivetrains. Sound familiar?
I don't doubt for a minute that the GM engineers knew exactly what they were doing (for the most part
) and made adaptations to car parts and procedures for the Motorhome so they wouldn't have to go to the trouble and expense of re-engineering and re-tooling to make low production numbers new parts. But they were working with a totally new animal, essentially a very large front wheel drive van, and there was a learning curve and a limitation of the available materials and procedures. Nowadays they'd spec a metric 12.9 bolt coated with anaerobic threadlocker and move on.
So I'm revaluating my thoughts on what's "best practice" for the output shaft bolt installation. I'll be keeping the Grade 9 Allen drive cap bolts and probably dropping the torque to 65 ft-lbs with blue threadlocker. I think that's a happy medium.
I appreciate everyone's input and thoughts on the matter. The back and forth helps home in on an answer, so thank you all.
You and me both, brother! But it's what I've been doing to date.
I'll be dropping the torque to 65 from now on, the why is described in my recent post in this thread.
I ended up with the bands included with the banding tools I bought on Amazon, I expanded one of the large ones and it came in at 29.5" - enough to double band. This is the $20 kit I purchased, was impressed with quality, seemed extremely well built and heavy duty.
https://www.amazon.ca/dp/B07XHGQ72L?
I also purchased this band kit as I hadn't received the tools and didn't know at the time that it came with long bands :
https://www.amazon.ca/dp/B0DRN8C44M?
now have enough bands to last a lifetime LOL
Larry
