Hello again,
I know and can understand why "dealerships" will not want to get involved, so that is why I recommended to contact "the customer care department manufacture of the vehicle directly".
If the manufacturer does not assist and you cannot find any credible documentation as proof, I would suggest that the most effective evidence would be a demonstrative or a video presentation clearly showing the functions of the AXD engine and how it is an interference engine.
Given that many diesel engines are interference engines, showcasing the AXD engine in action would provide irrefutable evidence supporting the claim. (who knows, maybe there is a video out there allready?)
While written documentation regarding the engine's design and specifications can be useful, if you can find some, it may not suffice on its own, as opposing parties might dispute it's accuracy or authenticity. However, demonstrating that the engine is what it is . . . well that is powerful and who can argue with that. (I guess uneducated laywers could find a way
)
edit...
Oh, one more thing. . . not that it says anything about interference, there is a VW Self Study Program # 305 called "The 2.5l R5 TDI Engine" tha can be found on the internet in PDF form and maybe helpful
Let us know how this works out,
drpeter
additional notes:
Below is from the Volkswagen repair manual and it kind of implies that this would be an interference engine if the wrong thickness gasket is used.
Note
♦ Different thicknesses of cylinder head gasket are fitted depending on the piston projection. When replacing the cylinder head gasket, install a new gasket with the same identification (note number of holes on right next to part number)
ref:
Workshop Manual: Transporter 2004 ➤
5-cylinder diesel engineEngine ID AXD AXE BLJ BNZ BPC
Edition 03.2018
(K0058980720-5-cylinder_diesel_engine.pdf)