1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

916 Cambelt Change Question

Discussion in 'Technical Help' started by maxwan, Jan 30, 2020.

  1. Hi . Looking for an answer to this . I followed the tipex dot your Cambelt then swap out and replace with you new replacement . I had all my timer markings in the correct position and all's well (I think ) .
    1 . Question is I rotated the back wheel and obviously the dots don't allign . How many revolutions till they match up again .
    2. Question If all the timing marks are in position and the belt is round why put tipex on , can't the belt go on as it is keeping the timing alligned . Thanks
     
  2. I'm tired and may not of understood correctly, so see what others say.
    1.Not sure and it depends on your gearing.
    2.The important thing is to get the marks on the cog wheels to line up with the marks on the casings. That is the key, Using the Tipex is just a short cut for this. You shouldn't be bothering with turning the back wheel when you can turn the engine over using a home made tool on the other side of the engine. Under here:
    upload_2020-1-31_2-27-15.png
     
    • Useful Useful x 1
  3. indeed :)
    tool looks like this:
    https://www.ebay.co.uk/itm/DUCATI-crank-tool/122601877273?hash=item1c8ba42f19:g:CwUAAOSwKrhVYxWn
     
    • Like Like x 1
  4. And if you really don't want to spend the money, you can just screw in a bolt with a locknut and turn it with a spanner but using the wheel is tricky due to gear train backlash etc.

    I don't see the point of belt marking, the alignment dots work fine and will line up every time whereas with belt markings who knows? Guess it depends on the ratio of teeth on the pulleys to teeth on the belt?
     
    • Agree Agree x 3
  5. As already mentioned, no need to mark the belts, it's a waste of time, just make sure all the timing marks are in the correct position and all will be fine.
    With the marks on the belts once the engine has been turned you could be turning forever to get the belt mark to line up again.
    Steve
     
    • Like Like x 1
    • Agree Agree x 1
  6. 1. no idea, as said above depends on your gearing and wheel size, but eventually they would line up again.

    2. iirc from when I last did mine, the Tipex dots are put on the old belt so the new belt can be marked in exactly the same place with exactly the same number of teeth between the dots. Its very easy, if they're not marked to put the new belt on and find there is one more tooth between the top two camshaft drives than there should be, especially as one of the camshaft drives will be under tension from the valves and will not want to stay aligned (unless you use the special tool). Thus when tensioning you won't get the correct tension and there's a chance your valve timing will end up one tooth out of alignment.

    Additionally, as sail\d above, you need to have the alignment dots on the camshaft drive and crankcase aligned
     
  7. The timing marks will be miles off if you are one tooth out.
     
    • Agree Agree x 1
  8. I have never used tipex on the belts. IMO it a waste of time, suggested by people who don't really know what they are doing for people who haven't a clue.
    I line up the timing marks using an engine turning tool. Pop off the old belts. Fit the new ones. Turn the engine through 2 revolutions so that the bottom pulley timing mark lines up again and re-check that the cam pulley marks are also lined up. Then finally tension the belts properly. Job done.
     
    • Agree Agree x 3
  9. If it's your first time changing the belts, one of the most important things to get right is when tensioning the belts, turn the wheel anti clockwise, otherwise you will have clearance problems.
    Like this.
    [​IMG]
    Steve
     
    • Agree Agree x 3
  10. What I found though, the first time I did it (and I was one of those who didn't have a clue at that time) was that it was possible to put the belt on with one two many teeth between the camshafts, especially easy when not using a camshaft holding tool and trying to fit the belt as well as hold the camshaft in position whilst under tension. The Tipex dots gave me reassurance, when the job was eventually done, that I had the cam belt installed correctly. I now have a camshaft holding tool, makes life much easier.
     
    • Like Like x 1
  11. Thanks all who replied . I finished the job all alligned . I was curious as I didn't understand why use tippex if all the timing marks correspond to their markings being a part time mechanic . Cheers all .
     
    • Like Like x 2
  12. Cogs, sprockets and gears usually are designed with odd numbers so that he belt or chain doesn't hit the same tooth every time - this makes them last longer.

    Using the tippex mark for installation is handy but not really necessary, counting teeth is as effective and can be checked after rotation if you are in doubt.

    Good you got it all sorted and as before mentioned it is very important to rotate the adjuster the correct way
     
    • Like Like x 1
    • Love You Love You x 1
  13. Good. The first time that I did it, I turned over the engine at least twice to ensure that I had it correct. Just to ensure that valves would not bash the piston.
     
    • Like Like x 1
    • Agree Agree x 1
  14. One more quick question. When I striped of the tank there were no air filter . Do I need to put one in ? And nothing in the side air vent duckts either . Cheers Paul
     
  15. Yes, I would put them in the side ducts, not expensive but if it hasn't got them in at the moment they need plastic frames . You can see the frames here, Pipercross filters are around £18.
    [​IMG]
    Steve
     
    • Agree Agree x 1
  16. Air filters are in the intake tubes either side and in front of the airbox, you need to remove and dismantle the tubes to get to them - at least the standard setup is like that anyway.

    You can get in airbox filters if nothing in the tubes and some aftermarket tubes don't have provision to fit them (mine don't).
     
  17. 2 options if in tube filters don't fit.

    ITG filter;

    [​IMG]

    BMC filters;

    [​IMG]
     
  18. Thanks again lads and lasses
    wondered why there weren't any .
     
  19. Being able to easily lock the camshaft pulleys together is a major advantage .

    Here's something I bodged up from a bit of angle iron , in my shed ....
    .... ugly as sin , ain't it ?

    The brutalized socket on the right is to deal with the so-called " elastic nuts "

    BTW - I keep meaning to start a new thread on home-made Ducati tools ....
    .... one day eh ?

    Cam tools.jpg
     
    • Like Like x 2
Do Not Sell My Personal Information