Cam Belt Tensioners

Discussion in 'Technical Help' started by the_duc, Jul 27, 2014.

  1. doing a 2V cam belt change shortly

    does anyone know the bearing number for the roller bearing?
    or is it a special? or even its correct name?

    i know the tensioners are just 6201-2RS x4

    any help appriciated
     
  2. The fixed roller Is a special. At one time it could be dismantled, with 2 small bearings inside it. I'll try to look out details tomorrow.
     
  3. Here's a picture from the 750 Paso parts list which used the Pantah engine. As you can see from the inset, the fixed rollers are built up with smaller bearings inside a sleeve. By the time of the 907ie, 5 years later, they are shown as one piece.


    [​IMG]
     
  4. Useful, Derek...........So can the Paso ones be used on a later (say, '96) SS, if they can be obtained?

    I'm looking at the inset diagram as well.......that is marked as 'd.m.' whereas the main diagram shows them as 'f.m.'......which is the later version do you think?

    AL.
     
  5. I was looking at using standard bearings, 8mm id, 24od you need 3 per roller,
     
  6. Yes, they would be a straight swap. I've no idea what 'd.m.' and 'f.m' mean so I can't help you there.
    It seems that Ducati moved to one-piece rollers with the Paso 906 in 1988, so only the Pantah and 750 Paso used the built up ones.
     
  7. 608-2rs x3 per belt
     
  8. There's only two bearings to each fixed and adjustable roller on mine..........now I am confused.....o_O
     
  9. The fixed roller is 21mm wide the 608-2rs bearings are 7mm wide each so x3 to make the width.
     
  10. How did you get them apart?............A lot of thumping?

    And............should you not be using C3 grade bearings, considering the heat of the engine and the rotation speed is greater than that of wheel bearings?

    Not being picky, just really interested.
     
  11. I wasent planning on taking old one apart just using those as a who replacement
     
  12. With a new bolt?
     
  13. Yes the 8mm id of the bearing fits the 8mm bolt and thead so may should be a swap
     
  14. Type/Grade of bolt and lengths (shank and thread)??
     
  15. Not measured as of yet, but i would use a hardend bolt, i guess with a spacer behind, making sure the 3 are aligned and that it only pinches up on the inner race
     
  16. Its only a cheaper alternative to the £40 each from ducati
     
  17. I guess the main thing is to get the shank length absolutely correct, but I suppose there is no reason a shim / spacer can't be used to ensure the working length of the roller is the same as the OEM thing.
     
  18. Any update on this yet? I'm interested to know if the idea worked.
     
  19. Not yet had chance too try im awaiting the cambelts still
     
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