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Rear mount torques - gearbox to subframe

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Focus mk 2.5 1.8 TDCI

Just put in the rear mounts. What is the torque of the one large bolt that connects these two ?

If this is the centre bolt of the rear mount as Haynes describes it's 120 Nm. That is far too much for the aluminium alloy that forms the body and just stripped the threads in it 

Screenshot_20241110-203320.thumb.png.6a3ec907fae6e834b0ec0559a8ebba47.pngScreenshot_20241110-2032052.thumb.png.2cb358658234f5b1f6875ef5ce7bc7f8.png

Going to fix it with a self tapping steel threaded insert to match the bolt M12 1.75 pitch) but still like to know the real torque for it.

Thanks in advance anyone who  knows the torque setting, as I can't find it surfing the net.



Screenshot_20241110-215923.png

  • Author

@iantt Great! Thanks a bundle.

Haynes also show rear mount to subframe (a long 15mm bolt) as 48 Nm which I thought well below what's needed. Your clip shows 80 Nm which seems right. 

The 80 Nm for the link bolt (also 15mm) is logical though probably the limit of the female thread in the aluminium alloy.

Ordered a steel self tapping M16 male thread with an M12 1.75 bore which will to insert into that light alloy to ensure a good bite. (sad OEM doesn't insert it).

  • Author

Ok did the job, with your torques, plus the 3 bolts to transmission at 50 Nm (probably officially 48 Nm) but just have an old torque wrench.

I can see the reason for the later design. It fills up the subframe box and thus braces it better so reducing torsional twist of the whole mount (not just the rubber). With the older smaller design the whole mount twists in the subframe pocket.

That said, the use of a helicoil in the new mount (for 80 Nm!) rather than a male / female insert is cheap. The old one has a proper steel female thread.

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