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Inlet Manifold & Swirl Flap - Stepper Motor Mounts


Enormouse
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Hello All,

My first time here, something the www cannot provide an answer for so hoping somebody can provide.

The image shows a pair of aftermarket inlet manifolds for a 3.0 V6 diesel from 2009, a common lump found within the Audi range throughout the '00s.   

Each manifold is provided with a set of three screws which are surprisingly coarse and have unusually sharp-to-the-touch threads.

The stepper motors each attach to the bolt holes marked by red arrows, these holes are parallel bores i.e. they have no threads.

My hunch is that the screws are a form of self-tapping version, although they do not provide any flutes for waste material hence my decision to ask my questions here.

Is it usual for the holes to be unthreaded?

Are the screws indeed self-tapping?

On that basis, I assume I simply line up and drive the screw in to secure the motor.

Any insightful knowledge on this matter gratefully received.

Thank you.

 

image.thumb.jpeg.ae6a8f32f2c163c64fb7720f778b2a43.jpeg

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3 hours ago, Enormouse said:

Hello All,

My first time here, something the www cannot provide an answer for so hoping somebody can provide.

The image shows a pair of aftermarket inlet manifolds for a 3.0 V6 diesel from 2009, a common lump found within the Audi range throughout the '00s.   

Each manifold is provided with a set of three screws which are surprisingly coarse and have unusually sharp-to-the-touch threads.

The stepper motors each attach to the bolt holes marked by red arrows, these holes are parallel bores i.e. they have no threads.

My hunch is that the screws are a form of self-tapping version, although they do not provide any flutes for waste material hence my decision to ask my questions here.

Is it usual for the holes to be unthreaded?

Are the screws indeed self-tapping?

On that basis, I assume I simply line up and drive the screw in to secure the motor.

Any insightful knowledge on this matter gratefully received.

Thank you.

 

image.thumb.jpeg.ae6a8f32f2c163c64fb7720f778b2a43.jpeg

Hi, yep self tappers, the body units are plastic so if you take your time and don't get them in at an angle they should be fine, its just a cheap way round putting in brass inserts.

Steve.

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Most grateful for the reply. With brass inserts for the covers I'm baffled to why the motors didn't also deserve them. I suspected they were self-tapping but didn't want to go ramming screws in and risk the manifolds cracking where there are no flutes in the screws.

To ensure straight entry, I'll do this on the bench with a motor as the guide before fitting the manifolds and making the job awkward. I assume that once tapped they can be removed and replaced without issue.

Thanks. Forums do work!

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