300 tdi timing idler stud... must I change?

Stripped the timing assembly down this evening and will rebuild tomorrow.

In the past Sort of pre-kits I have just bought belts and what not and fitted them, this time I bought a convenient kit.

I happened to notice a set of instructions with the kit which I read over, a couple of things came up I am now keen to get answers on.

It comes with a new stud... why replace the stud? It also says if the chest doesn't have a 45degrees chamfer to cut one 2mm deep with a countersink. Why?

As I can see the idle and tensioner frame fasten down onto a flat face on the chest, as long as the stud is solid then nothing is going anywhere.

I'd be keen to hear people's thoughts on this.

Hi,

The only thing I can say on this , is that the torque for the idler stud in the timing chest is remarkably low. Mine had a chamfer aleady.

I think, but not sure, the one I replaced had "threadlock" on it.

Cheers

No mine was not madly tight to remove.

It just makes me question the purpose of a new stud. Not like it's yielded or anything.

It's an aluminium chest so messing with studs is not a good idea in my book. Leave well alone is my thinking but I will regret this if sonething goes wrong... I just don't see the benefit of the 45degree chamfer either and going at it with a drill isn't ideal either...

The only reason I can think for the chamfer is to avoid the risk of having a burr stopping whatever is attaching at that point from being held flat and also to stop the risk of the burr reducing over time and making the nut from being at its correct torque, if that makes sense.


Cheers

I am going to leave my stud well alone then. It's spot on. Messing with it is more likely to creat an issue.