Torque Spec for CV joints

[Poptopcamper]

I read a while back on this forum that 33 foot pounds is the proper spec for CV joints. However my Bentley manual says 25 foot pounds. i have a 1978 Bay Riviera camper.?
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1978 VW Riviera
2021 Dodge Ram 3/4 ton
2020 VW Tiguan
2001 Harley Electraglide Classic
1986 BMW R 800cc motorcycle
2002 Chevy Camaro Z28
1999 Harley Sportster 1200 Custom

[ImAddicted]

Several have had better luck with the Vanagon specs (33) than the bay specs (25). When I rebuilt mine a while back, I did 33.
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KC1MUR

[Wildthings]

If you want them to come loose, torque them to the Bay spec of 24 ft*lbs, whereas if you want them to stay tight then torque them to the Vanagon spec of 33 ft*lbs. Lots of threads in the Bay forum about CV's coming loose, but few in the Vanagon forum even though the parts are the same and the Vanagon have more power and weigh more.

[Poptopcamper]

33 it is! Thanks.😎
_________________
If you only have one tool in your tool box, and it's a hammer, pretty soon, everything looks like it needs to be whacked!
1978 VW Riviera
2021 Dodge Ram 3/4 ton
2020 VW Tiguan
2001 Harley Electraglide Classic
1986 BMW R 800cc motorcycle
2002 Chevy Camaro Z28
1999 Harley Sportster 1200 Custom

[raygreenwood]

I have never been sure why VW listed 24 ft lbs.

You can look anywhere for standard DIN torque specs for a class 12.9, 8mm x 1.25 bolt and the lowest I can find is 31 ft lbs....and that is for coarse thread ...8mm x 1.25. The same chart below lists 33 ft lbs for fine thread...8mm x 1.0

https://www.fastenermart.com/files/metric_tighten_torques.pdf

But...I do find torque specs for class 12.9....8mm coarse thread....with zinc plating....at 25 ft lbs. I know for a fact that this is because teh zinc plating has a slight lubricating effect if its oxidized in the least.

Ray

[aeromech]

Smoke tight and half a turn
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[skills@eurocarsplus]

[raygreenwood]

[skills@eurocarsplus]

[Abscate]

I confess it’s one of the joys of life to renew fasteners in a 20 year old Volvo but those BUFO hardware are also works of art. Luckily TASCA is pretty good pricing on this stuff.

I think way too many grope for the torque wrench instead of learning the art of fastener tightening by feel but that’s just one dumbass’ opinion.
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[Poptopcamper]

[skills@eurocarsplus]

[skills@eurocarsplus]

[aeromech]

[Jrh5r]

I had a cv joint come loose yesterday afternoon in the pouring rain. Had to pull over on the side of the road and use what bolts were left and limp home. About to go redo it now and add some medium loctite and check the other side. It was not a fun way to end the day, and don’t want that happening again.
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1973 1.7L Bus

[aeromech]

It happened to me once around 1986 at 2am on a dark road. That was the one and only time I’ve ever seen a loose cv. That said, torquing the cv bolts should be included in your maintenance schedule
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[richparker]

Another easily searchable informative thread on The Samba. Many thanks!

I borrowed a torque wrench from the fleet mechanic at work this weekend so I could torque the heads on my beetle motor. I’m at 2000 miles on that motor now and figured I should get it done since it was gonna be nice this weekend.

While I had the wrench I decided that I should also torque the CVs on my bus. I recently rebuilt both axles using the Tiguan OEM VW boots and I’m hoping not to have to fuck with them for quite some time. Unfortunately I had one of the bolts stretch and break before I hit 33 fpt. 🤬

I decided to pull all the bolts out and see if I could access the broken part in the axle. Luckily I was and it threaded out by hand. 😅 I dug through my spare CV bolts and found a nice looking 12 pt bolt and installed it. Took an extra 15 minutes, but now they are all torqued to 33.

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[SGKent]

don't know the problem. never had one come loose in 600,000 miles. Everyone using a good serrated / Schnorr washer under the bolt head?
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[Jetfxr69]

agree with blue locktite, serrated washers, and a re-torque after a few miles. Had one come off on me prior to these steps as well. Havent lost one since.
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[richparker]

I’ve never had any issues. Just figured since I’ve read about torquing them sooo many times I’d do it since I had the wrench for the weekend. I should just buy one.
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Adventure thread
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