Transmission Mount

I installed a new transmission mount and snapped two bolts (#3 in the diagram).
Attachment 53494
The Bentley repair manual mentions that the bolt is to be torqued to 100nm. I didn't even get to 70nm before it snapping. It was seated correctly and I had hand tightened it prior to using a torque wrench.

I've ordered some new replacement bolts and will be repairing the threads but I was wondering if I either read the manual incorrectly or the torque figure is different.

The car is a MK4 1.8T with a 02J transmission.

Any help is appreciated, thanks :)

Quote:

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Originally Posted by ybkopa

I installed a new transmission mount and snapped two bolts (#3 in the diagram).
Attachment 53494
The Bentley repair manual mentions that the bolt is to be torqued to 100nm. I didn't even get to 70nm before it snapping. It was seated correctly and I had hand tightened it prior to using a torque wrench.

I've ordered some new replacement bolts and will be repairing the threads but I was wondering if I either read the manual incorrectly or the torque figure is different.

The car is a MK4 1.8T with a 02J transmission.

Any help is appreciated, thanks :)

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They are torque to yield bolts. One time use. Although many have reused with out issue, myself included - this is incorrect practice.


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Quote:

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Originally Posted by HaydEn

They are torque to yield bolts. One time use. Although many have reused with out issue, myself included - this is incorrect practice.


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I'm aware of that, I should of noted, I didn't re-use the bolts. I bought brand new OEM bolts.

new bolts, both mounts flush up against each other, hand tightened first, seated correctly. You've done everything correct.

For me there is only 1 conclusion here.

You had the torque wrench set to 100lbs, not 100nM.

Don't be embarrassed, we've all done it :emo_baghead:

Got the correct length bolts? nothing in the bottom of the hole stopping it by bottoming out.
Maybe just unlucky

Quote:

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Originally Posted by beale187

new bolts, both mounts flush up against each other, hand tightened first, seated correctly. You've done everything correct.

For me there is only 1 conclusion here.

You had the torque wrench set to 100lbs, not 100nM.

Don't be embarrassed, we've all done it :emo_baghead:

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Nah, it was definitely set to 100nM, I've got a fancy GearWrench torque wrench so I'm certain on that ;)

Quote:

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Originally Posted by dylan8

Got the correct length bolts? nothing in the bottom of the hole stopping it by bottoming out.
Maybe just unlucky

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Definitely the correct length bolts, they were ordered from the dealer and the part number was correct.

Update: the problem has been resolved. The bolt was going down nearly all the way into the hole before getting any grip onto the threads.

Tried a tap and die set and it didn't do the trick, had a thread repair guy come out today and he used his helicoil kit and now we're all good!

Quote:

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Originally Posted by ybkopa

Nah, it was definitely set to 100nM, I've got a fancy GearWrench torque wrench so I'm certain on that ;)



Definitely the correct length bolts, they were ordered from the dealer and the part number was correct.

Update: the problem has been resolved. The bolt was going down nearly all the way into the hole before getting any grip onto the threads.

Tried a tap and die set and it didn't do the trick, had a thread repair guy come out today and he used his helicoil kit and now we're all good!

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Ahhh yes. I did have that on one of mine. Helicoil has done the job so far. Forgot about that.

I read somewhere that the threaded part (mount on the motor) should be replaced every 3rd time the bolts are removed.

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