Which ones do u change? Mount to engine bolts? Or body to mount bolts? Or all?

Anyone have part numbers?

Thanks

Omp

No need to replace them mate. Just out of interest, why do you think you should?

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Apparently they are specially treated bolts which are one use, similar to a stretch bolt. Heard some have failed causing big issues when not changed.

They aren't stretch bolts mate as I've just replaced my engine mount and had mine out. The bolts are treated in the fact that they look like they are dipped in something to stop bimetal corrosion occurring between the steel bolt and the aluminium thread it screws in to. When I took mine out there was nothing which indicated they would cause a problem by going back in as they looked in good condition with the coating still visible and intact

The bolts I am referring to are only torqued to 30NM if I remember correctly which won't stretch that size a steel bolt in an aluminium thread.

The bolts securing the mount to the body are nothing special either and are only torqued to 20NM meters I believe and the centre nut securing the two bits of the mount together is torqued to 40NM meters.

What I've put I believe to be correct to the best of my knowledge and should hopefully give you the basis to look in to it further. No doubt other people with chip in also. There was a thread discussing this recently also.

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I let VW do my cambelt earlier this year on the Polo, and they didn't change any of these bolts.

 

I believe all those torque figures above are torque  +90° turn (which doesn't make them stretch bolts, it's just a more accurate way of tightening), and the one between the two bits of the mount shouldn't be undone.

 

A friend of mine had his cambelt done on his TDI Mk1 Octavia and 'backstreet Joe' managed to strip one of the threads that the longer bolts go into (not sure if that was during disassembly or reassembly). So problems do happen with the steel bolt/alloy thread situation.  No idea whether the bolts had previously been re-used or not on that one though. That's the risk I think, not so much the first re-use, as the second or subsequent ones, thread galling where the ali sticks to the steel. As AshVrs says though, you only have to look at them carefully to see whether that's happened.

So is the general consensus on this to just reuse what I take off then?

So is the general consensus on this to just reuse what I take off then?

 

Yeah, no problem at all with doing that.