Rotten bolts in engine

[mwnciau]

I have a 2011 Vauxhall Corsa, and noticed some of the bolts on the engine are rotting away and crumbling. How concerned should I be? Is this something that I need to get sorted asap? It passed its MOT in January.

Pics:
i.postimg.cc/V6KyGHkb/PXL-20240524-155929641.jpg
i.postimg.cc/9Mm5BjCh/PXL-20240524-155933238.jpg

[Mercdriver]

Probably not high tensile bolts I would change them asap.

[stevieturbo]

They are studs and nuts. Not that uncommon really.

They'll probably last quite a few years without issue though, depends how long you intend to keep the car, whether you wish to change.

And it could turn into a bit of a ballache to change, or it could go smoothly. You just never know til you start.

But ensure you have the tools and skills needed to remove things if they go wrong

[E-bmw]

They look like they are on a heat-shield on the exhaust.

Not a problem, just ignore.

[TwinKam]

Theu are the exhaust manifold studs. Not a problem until you need to remove the exhaust manifold. I wouldn’t advise touching them until that time unless you're skilled enough to deal with them if the nuts round off or the studs shear off.

[InitialDave]

Exhaust manifold/heat shield studs and nuts.

The heat cycling and exposure just murders them.

I wouldn't be too concerned unless you need to change the manifold, at which point it will need care, technique, and luck to remove them cleanly without shearing.

Not at all harmful for general use of the car, and already at the point where proactively doing anything about them might be disproportionate hassle.

[Chris32345]

If the manifold isn't leaking leave well alone



Almost certain to snap off or be seized solid