Not quite true. The part numbers in the factory parts references are for
the parts to be used and are often not the number of the original part.
The 2 cases are different but the 1.9 case is no longer available.

Check page 13.57 of the latest Vanagon Bentley for info on replacing a
1.9 case with the 2.1 case.

Mark

Matthew Pollard wrote:
>
> They are THE same part # per etka 025 101 025a  IIRC, they 2.1 is a
> longer stroke. I suppose that is a cheaper way to get more displacement
> than a new case casting.
>
> Jfp w/3 WBXs wrote:
> >
> > Hi List,
> >
> > Do the 1.9L & 2.1L engines share aa common crankcase(same part number)thus
> > they are interchangeable????
> >
> > Regards,  John
>