Driveshaft Bolts Sheared
Discussion
My "new" Can Am is testing my patience. Went out for a little spin yesterday and 2 bolts sheared from one of the driveshafts. It looks like all the bolts had worked their way loose over time and it was not something I spotted.
Anyway ... I have got new bolts on order and will make a start on drilling out the sheared ones ready for them. My transmission is a Porsche 930 (turbo) gearbox and the helpful AA guy said "is that a VAG Group tranny cos they all do that"! Has anyone else experienced this and, apart from preventative maintenance, what can I do to stop it happening again?
Cheers
Anyway ... I have got new bolts on order and will make a start on drilling out the sheared ones ready for them. My transmission is a Porsche 930 (turbo) gearbox and the helpful AA guy said "is that a VAG Group tranny cos they all do that"! Has anyone else experienced this and, apart from preventative maintenance, what can I do to stop it happening again?
Cheers
jaylward said:
My "new" Can Am is testing my patience. Went out for a little spin yesterday and 2 bolts sheared from one of the driveshafts. It looks like all the bolts had worked their way loose over time and it was not something I spotted.
Anyway ... I have got new bolts on order and will make a start on drilling out the sheared ones ready for them. My transmission is a Porsche 930 (turbo) gearbox and the helpful AA guy said "is that a VAG Group tranny cos they all do that"! Has anyone else experienced this and, apart from preventative maintenance, what can I do to stop it happening again?
Cheers
When I got my car the previous owner said to keep an eye on the drive shaft bolts but I haven't needed to touch them other than when I had the LSD bias changed to suit the mid engine layout.Anyway ... I have got new bolts on order and will make a start on drilling out the sheared ones ready for them. My transmission is a Porsche 930 (turbo) gearbox and the helpful AA guy said "is that a VAG Group tranny cos they all do that"! Has anyone else experienced this and, apart from preventative maintenance, what can I do to stop it happening again?
Cheers
Paint stripe each bolt once torqued down, that way a quick look will tell you if any bolts have moved.
A more permanent solution would be to lock-wire the bolts but you will need pre-drilled heads (or drill them yourself).
I have this issue a lot with 930CV bolts - mainly from the massive shock loading - no matter how tight they were torqued or what loctite was used (even cleaning them with acetone and scotchbrite first to help it key) they would come loose as the joints flexed. I was under the car re-torquing them after every single stage.
Stuck Nord-Lock washers under them and haven't had to touch them since.
I don't bother with lockwire as although it stops them coming out it doesn't stop the loss of preload which means they eventually shear or distort the holes and threads in the gearbox cups under the shock loads instead.
Stuck Nord-Lock washers under them and haven't had to touch them since.
I don't bother with lockwire as although it stops them coming out it doesn't stop the loss of preload which means they eventually shear or distort the holes and threads in the gearbox cups under the shock loads instead.
Edited by PhillipM on Saturday 18th June 23:20
PhillipM said:
I have this issue a lot with 930CV bolts - mainly from the massive shock loading - no matter how tight they were torqued or what loctite was used (even cleaning them with acetone and scotchbrite first to help it key) they would come loose as the joints flexed. I was under the car re-torquing them after every single stage.
Stuck Nord-Lock washers under them and haven't had to touch them since.
I don't bother with lockwire as although it stops them coming out it doesn't stop the loss of preload which means they eventually shear or distort the holes and threads in the gearbox cups under the shock loads instead.
Yes +1 forgot about them, also known as ring-lock washers.Stuck Nord-Lock washers under them and haven't had to touch them since.
I don't bother with lockwire as although it stops them coming out it doesn't stop the loss of preload which means they eventually shear or distort the holes and threads in the gearbox cups under the shock loads instead.
Edited by PhillipM on Saturday 18th June 23:20
Gassing Station | Ultima | Top of Page | What's New | My Stuff