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cmonSTART
Samba Member
Joined: July 15, 2014
Posts: 1915
Location: NH
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 Posted: Tue Aug 25, 2015 5:01 pm Post subject: So it turns out CV shafts can fall off! |
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So it turns out they can fall off - and it will happen during a torrential downpour. Samba searches since show it's not an uncommon thing - I'll have to get some lock washers on these things.
No real damage except for a torn CV boot. I had spare screws on the shelf at home, so I got a few screws in it and nursed it back.
The kicker is I was just under there this past weekend - should have checked!
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'78 Bus 2.0FI
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Brian
Samba Moderator
Joined: May 28, 2012
Posts: 8339
Location: Oceanside
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| Posted: Tue Aug 25, 2015 5:03 pm Post subject: |
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Yup, not properly torquing bolts will cause that to happen. Trust me, I learned around the 3rd time that a good torque wrench is worth having.
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babysnakes
Samba Member
Joined: August 19, 2008
Posts: 7185
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| Posted: Tue Aug 25, 2015 5:11 pm Post subject: |
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| Get the correct serrated lock washers. Anything else is a fail. |
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Brian
Samba Moderator
Joined: May 28, 2012
Posts: 8339
Location: Oceanside
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| Posted: Tue Aug 25, 2015 5:26 pm Post subject: |
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| babysnakes wrote: |
| Get the correct serrated lock washers. Anything else is a fail. |
Yup, lock washers and torque. Torque is the biggest thing. You don't really need to use the torque washers though.
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Tom Powell
Samba Member
Joined: December 01, 2005
Posts: 4852
Location: Kaneohe
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| Posted: Tue Aug 25, 2015 5:28 pm Post subject: Re: So it turns out CV shafts can fall off! |
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| cmonSTART wrote: |
| So it turns out they can fall off - and it will happen during a torrential downpour. ... |
And clutch cables break in cold weather and it is no fun to change one lying on ice or in the snow. Parking the driver's side wheels on a curb gives room to work underneath. A long string and vise grips are your friends.
Aloha
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babysnakes
Samba Member
Joined: August 19, 2008
Posts: 7185
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| Posted: Tue Aug 25, 2015 5:40 pm Post subject: |
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| Brian wrote: |
| You don't really need to use the torque washers though. |
Bull shit. |
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Brian
Samba Moderator
Joined: May 28, 2012
Posts: 8339
Location: Oceanside
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| Posted: Tue Aug 25, 2015 5:47 pm Post subject: |
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I use them, but you don't need them. Proper torque and you're good.
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cmonSTART
Samba Member
Joined: July 15, 2014
Posts: 1915
Location: NH
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| Posted: Tue Aug 25, 2015 5:55 pm Post subject: |
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Do you guys have a source for the serrated lock washers?
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Brian
Samba Moderator
Joined: May 28, 2012
Posts: 8339
Location: Oceanside
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cmonSTART
Samba Member
Joined: July 15, 2014
Posts: 1915
Location: NH
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| Posted: Tue Aug 25, 2015 6:14 pm Post subject: |
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Wow, forgot all about that thread. I actually checked them after I read that one, but I've done some wheel bearing work since then.
Thanks!
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LivinInnaVWBus
Samba Member
Joined: October 07, 2013
Posts: 968
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| Posted: Tue Aug 25, 2015 6:48 pm Post subject: |
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| Take a look at the link in my signature. Part number, pricing and other info on the washers you need. 2nd or 3rd page I believe, comment on the thread if it helps you! |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 23560
Location: Oklahoma City
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| Posted: Tue Aug 25, 2015 6:48 pm Post subject: |
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| cmonSTART wrote: |
| Do you guys have a source for the serrated lock washers? |
Mcmaster Carr. Search on their site for serrated lock washers. In the menu...select spring washers.....select metric.
Read the text. There are four varieties.....serrated bellville disc washers (what you want) and non serrated bellville disc spring, washers (nice but not what you want).
The next difference is select/scroll the menu for those used or allen/soxket head bolts (smaller OD....what you want). Do not select for hex head bolts unless that is what you are using.
I just had to shop back some to Mcmaster carr last week... because I got in a hurry ordering a bag of 6mm serrated bellville washers...and got non-serrated...because in the catalog....even the non serrated ones use a drawing of a serrated washer.
The part # you need for CV bolts is 93501A030......bag of 100 for $11.71.
They can be used for hex head bolts with no real problems. They just have a little less surface area than the part number that is actually for 5/16" bolts and has a .020" larger OD and about .010 smaller OD. So these will work just fine for 8mm case bolts as well.
Do not use stainless. They do not have great long term tension charatlcteristics.
These are on page 3238 of the catalog on line. Ray |
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shiningstar76
Samba Brewer
Joined: July 12, 2003
Posts: 2689
Location: Savannah
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| Posted: Tue Aug 25, 2015 6:51 pm Post subject: |
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Bizzare, the same thing happened to me today on the way to work.
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96 Tacoma
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My bus caught on fire and is now on the other coast with someone who gave me money for it. |
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cmonSTART
Samba Member
Joined: July 15, 2014
Posts: 1915
Location: NH
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| Posted: Tue Aug 25, 2015 7:00 pm Post subject: |
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Thanks guys. McMaster-Carr saves the day again.
Shingingstar - glad I'm not alone today!
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Tcash
Samba Member
Joined: July 20, 2011
Posts: 12843
Location: San Jose, California, USA
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| Posted: Tue Aug 25, 2015 7:02 pm Post subject: |
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| Tcash wrote: |
Click on links.
How to Remove Stripped CV Bolt Head
CV Joints: Re-pack or Replace?
CV Joint Service (Lobro)
PSA - Nord-Lock your drive shaft (CV) bolts
1970 VW Type2 CV Joint Play
https://www.youtube.com/watch?v=mgwmuZuJ02I
Prt#113 501 229 A and 211 501 229, CV bolt, Socket Head, M8-1.25 x 47, 12.9 hardness, to 70.
Prt# 893 407 237, CV bolt, 12 point polygon head, M8-1.25 x 48, 12.9 hardness, to 71-79. Will work on 68-91 Buses.
Good Luck
Tcash |
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 42985
Location: at the beach in Northern Wokistan
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| Posted: Tue Aug 25, 2015 7:06 pm Post subject: |
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when you change your oil check the CV joints, If you are lazy only check two and do the other two next oil change. Same for the lug nuts.
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cmonSTART
Samba Member
Joined: July 15, 2014
Posts: 1915
Location: NH
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| Posted: Tue Aug 25, 2015 7:19 pm Post subject: |
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Makes complete sense. I have the wheels up anyway to adjust the brakes when I do an oil change.
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 52761
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| Posted: Tue Aug 25, 2015 7:20 pm Post subject: Vanagon CV bolt torque specification 33 ft lbs |
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The Vanagon upgraded torque spec for the identical parts is 33 ft*lbs IIRC. Peruse the Vanagon forum and you will find few threads about CV bolts coming loose when compared to the Bay Window forum. I learned to tighten the crap out of these bolts when I bought my first IRS VW decades ago and have never had one bolt loosen in all those years. IMO torque counts more than anything else, I would rather toss the washers and spreader plates than use the measly 24 ft*lb bus torque spec.
The Vanagon guys don't have to try to dream of exotic ways to keep their CV bolts tight, they just tighten them to the upgraded spec recommended by VW. |
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Brian
Samba Moderator
Joined: May 28, 2012
Posts: 8339
Location: Oceanside
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| Posted: Tue Aug 25, 2015 7:37 pm Post subject: |
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Yop. around 30 lbs and you're solid. I've been told by two Class 5 Baja 1000 winners that you only need a shit ton of torque and no washer.
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Wash your hands
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'68 Baja Truck
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[email protected]
Samba Member
Joined: June 02, 2011
Posts: 1593
Location: Louisville, ky
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| Posted: Tue Aug 25, 2015 7:44 pm Post subject: |
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| The bolt is hardened steel. The lock washer is mild steel. The lock washer is not going to cut into the bolt to create the lock. That being said I put new lock washers on that part every time anyway. I buy boxes of lock washers and sprinkle them around like fairy dust. |
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