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Discussion Starter · #1 ·
Hello Fellow New Beetle owners.
This is my first post. We bought an 06 New Beetle Convertible used from a relative. I knew the car had not been super-well cared for, but it was offered at a great price and I figured it would be okay. Well - there have been several issues that now have me concerned.

The car had the feared borg warner transmission clunk issue - but the prior owner did not tend to it within the warranty period so I found a local shop and had it repaired properly. Tranny is now great.

Fast forward to about 6 weeks ago when my daughter had an issue with the car - the v-belt came out of track and the car locked up. Further investigation found that the bolt that secures the dogbone from the subframe to the transmission had sheared off - - so the engine was able to move too much - causing the belt to come out of track.

I was able to remove the sheared bolt and replace it with the Stretch bolt I bought from the dealer. All seemed well

about 6 weeks of driving and - lo and behold - same exact problem.

I'm wondering:
1- could the motor mounts be too "soft" - - allowing the engine too much movement, which is causing the bolt shear?

2- Should I install a stronger/harder (e.g. 12.9) 10mm bolt to try to address the shear issue?

3- Should I consider replacing the motor mounts too?

Note that at this point I'm probably over-invested in the car - - given the tranny and some other items I've had to repair - - so going in and doing the motor mounts is not exactly something I'm keen to do - - esp since it might not resolve the problem for sure...

ANY advice / guidance is greatly appreciated.

Other fyi:
I'm in SoCal - Los Angeles area.

The car was previously in the desert - -Palm Springs. Thinking maybe the high heat would contribute to premature motor mount breakdown???
 

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Discussion Starter · #3 ·
Hi -
Thanks for your addition to the post.

The bolts for the transmission were all replaced with vw stretch bolts. Seems solid.

When I removed the prior (sheared) bolt, I replaced it with a VW stretch bolt (head stamped 8.8).

I had to remove the dogbone at that time (to get clear access to the broken bolt) - so I actually replaced all the bolts with new stretch bolts.

Now I am going to remove the recently-sheared bolt and I am replacing it with a hardened bolt (grade 12.9)

We'll see how things go from here....

-J
 

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Hmm. Sounds like you are troubleshooting this methodically. Is it possible that the torque wrench that you used to torque the stretch bolts is a little off, and caused the stretch bolts to be overtorqued? Besides the motor mount, that's the only other thing that I could think of.
 

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Discussion Starter · #5 ·
That's a good thought. I used the air wrench at my friend's shop (he has a lift - what a relief!) - - but for this next re-install I'm going with my old-school torque wrench that I know is calibrated.

Should be making the repair over the weekend - will keep you posted.

Appreciate the suggestions-
John
 
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