Some of my Air box securing screws are corroded badly now. Did try oem source but they different to those fitted on mine. Instead of bolt type mine are a 35 mm length shank which is 4 mm dia most of the length except  a coarse thread at the end which is app 5 mm dia. Does anyone know a source for these 

You need to give your engine code as the air intakes for various engines differ.  The link HERE is for the parts catalogue for a 2010 2 litre diesel (BKD,AZV,BMM).

 

Can you locate the fasteners you need on the diagram?

Not shown. I've read somewhere that they were not sold as a separate items you had to buy the whole air box unit. People bought second hand Air boxes to just get the screws. I've seen part no ( WHT002087) that might fit ?

 

 

Yeah, They're a captive screw, So VW will sell you six, no probs, with a new airbox to go with for £££!

 

But those WHT002087 are identical as I remember just with a phillips head. Mind you they are probably made from the same mild steel so will end up the same way. I did buy some 5mm x 40mm stainless hex heads I was going to file down the flat section but never did get around to it!!

Nip down to your nearest DIY outlet and get the nearest match, cutting a new thread in plastic with a self tapping screw will do the trick.

10 hours ago, MicMac said:

Nip down to your nearest DIY outlet and get the nearest match, cutting a new thread in plastic with a self tapping screw will do the trick.

Yes, but without the smoothed section on the screw for the top box to move freely and the thread only be on the bottom section, it doesn't work as well. 

The key thing with such fasteners is that it's a Philips head not a posidrive one. Posidrive bits don't fit correctly and will tend to chew up the head, which then promotes corrosion. 

 

screw - Is it a bad idea to use a Pozidriv screwdriver on a Phillips head? - Motor Vehicle Maintenance & Repair Stack Exchange

 

If the heads are corroded or chewed up just cut a slot in them for a flat screwdriver using a Dremel?

@TheClient

 

If you have suitable screws to grip the lower section simply run an appropriately sized drill through the upper section to allow free movement.

You only need to remove them once or twice a decade so dont commit too much time, money or headspace to it, cutting a slot with a hacksaw or dremel is the quickest way to get back to the real challenges in life.

 

And yes, I know the service schedule says the element should be changed more often but my remarks are based on 15 years and 250000 miles of experience, if you keep a weather eye on the fuel consumption display you will soon know if it ever may need inspecting.

many thanks for the tips. As can be seen from my posts trying to do service / maintenance work myself this time around. I do have one more post but will do that separately. Just a comment, the new front shocks / top mounts have transformed the ride / feeling of the car which is a result.

I would recommend at least cleaning the air filter more often than once every 5 years even if not replacing. But it does depend a bit on the climate, roads and amount of dust where you drive. I too have a little bit of driving and maintenance experience.

My old Octavia had exactly the same problem, the airbox screws rusted away.

 

I used similar to the below from Wickes. As said they required cutting a new bit of thread into the plastic but they held fine and lasted the remaining 6 years I had the car.