Timing chain rails -S38 (archive)

Does anyone know if the side plastic guide rail and/or the rubber on metal tensioner rail can be replaced without removing the cam box or head? I want to do some preventative maintenance before putting in a chip and cam gear but I don't want to disassemble much since the car runs perfectly (134K). I'll do the tensioner piston anyway I guess. Or if I can pull the cam box out without removing the cams or head bolts, I would do that if it allows me to replace the rails. Any related suggestions welcome.

Thanks in advance - still don't have an engine manual.
I am adding this link to Eric Christie's 92 M5 teardown, a good read but doesn't answer my question.

Ted

http://www.austintx.net/echristie/M5/Projects.htm

Follow Ups:

Re: Timing chain rails -S38 Neil Deshpande 22:42 11/04/2001 (0)
Re: Timing chain rails -S38 Mark 13:57 11/04/2001 (4)
- S38B35 front cover is removable without head/box Greg K 14:26 11/04/2001 (3)
  - Re: S38B35 front cover is removable without head/b Mark 14:46 11/04/2001 (2)
    - Re: S38B35 front cover is removable without head/b Greg K 18:07 11/04/2001 (1)
      - Re: S38B35 front cover is removable without head/b TedM5 22:12 11/04/2001 (0)

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