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Loose bolts in driveshaft coupling.
06-03-2017, 05:00 PM
Post: #1
Loose bolts in driveshaft coupling.
For the third time now all the bolts in the left (rear) outer driveshaft coupling have come undone despite having fitted anti-vibration washers and Loctite last time it happened. It's always the left rear coupling. My theory is that it's caused by vibration due to driving a lot on corrugations because the inner joints (CVs) don't receive any up/down movement so would have less tendency to slacken, and the right side bolts turn in the opposite direction so would tend to tighten instead.

Last time this happened, in August 2015, I removed the left driveshaft on Dean's advice, engaged the difflock and drove 300km home in "one-wheel-drive". Fun!

It's quite interesting but I need to find a fix for this now. Does anybody know of one?

Thanks
Colin
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06-04-2017, 11:00 AM
Post: #2
RE: Loose bolts in driveshaft coupling.
put your bolts in with copper slip grease, also tighten them 3 times in a circular motion, also try get spline bolts, rather than allen bolts, they can tighten with more force

I may be a mechanic, but i can't fix stupid
Syncro, syncro , syncro and more syncro, this is the syncro way of life
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06-04-2017, 04:11 PM
Post: #3
RE: Loose bolts in driveshaft coupling.
Thank you Stuart, I have the 12-point spline bolts already, they came with a new set of couplings last time this happened. Are you recommending copperslip on the threads or under the heads of the bolts? The threads were loctited last time and that didn't help even with the anti-vibration Heico-Lock washers. {For type see the image (http://www.heico-lock.co.uk/Images/homep...age.gif)}.

I haven't stripped the hub personally, it's been done by a good workshop who are quite embarrassed that they can't find a solution to this and didn't charge me this time, so I haven't seen the internals personally but I was wondering if there might be room for longer bolts with nylock nuts on the outside of the axle shaft coupling. What do you think?

Thanks
Colin
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06-04-2017, 08:24 PM
Post: #4
RE: Loose bolts in driveshaft coupling.
I have also read that these bolts need to be torqued up to 35 Nm. Did you use a torque wrench to fit them?

1989 2.0i Syncro Camper (in progress!)
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06-05-2017, 05:27 PM
Post: #5
RE: Loose bolts in driveshaft coupling.
I didn't do it but I gave them the torque value and asked for 1/8th of a turn more.
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