Simple 355 tensioner setting procedure? | FerrariChat

Simple 355 tensioner setting procedure?

Discussion in '348/355' started by carwhisperer, Dec 18, 2015.

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  1. carwhisperer

    carwhisperer Formula Junior

    Sep 29, 2014
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    I hate to ask this because I know the info must be here somewhere but I've been searching for 10 minutes and still can't find it. What are the basics for setting the timing belt tensioners on a 355? I do plan to read the WSM but I'd like to see the important steps outlined from an Fchatters perspective.
    Brian
     
  2. yelcab

    yelcab F1 World Champ
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    One of the most well kept secret. You follow the factory manual to the letter.
     
  3. carwhisperer

    carwhisperer Formula Junior

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    OK I can't access the manual. I have tried on 3 different computers and it won't download, or if it does the file just seems to large to manipulate. I can't even scroll down the pages. I was able to access the 348 manual and used it when I had a 348 but I can't get the 355 one to work.

    Can someone at least tell me the basics?
     
  4. johnk...

    johnk... F1 World Champ
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    #4 johnk..., Dec 18, 2015
    Last edited by a moderator: Sep 7, 2017
  5. carwhisperer

    carwhisperer Formula Junior

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    Thank you so much and that helps with reassembly. What I really want to know, though, is how to approximately find TDC for number 1 before I take things apart. Should the flat spot on the trigger wheel be lined up with the crank sensor that is at 3 oclock? With the one that is 6 oclock? Something else? What about the little hole in the trigger wheel? Does it mean anything?
     
  6. yelcab

    yelcab F1 World Champ
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    Remove the valve covers
    there are four index marks, one on each cam shaft.
    Turn the crank shafts until all four marks line up with their respective notches.
    Then, you are approximately at 1 TDC. You can now disassemble the belts and tensioners.

    To find true TDC, you need to attach a degree wheel, AFTER you have put on the new belts.
     
  7. carwhisperer

    carwhisperer Formula Junior

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    OK. Is there any way to get close without removing the cam covers? Can you tell by the dots on the trigger wheel or the flat spot?
     
  8. Dave rocks

    Dave rocks F1 World Champ
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    You don't need a degree wheel to find TDC, you do this with a dial indicator off the top of the piston. You do need a degree wheel to set timing. Using a dead stop does require a degree wheel but an indicator does not (to find TDC)
     
  9. SoCal1

    SoCal1 F1 Veteran
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    Set tension per manual.

    I double check all my belts and record values with my trusty gates sonic tension meter

    [ame]http://www.youtube.com/watch?v=KKQBhis1sjk[/ame]
     
  10. carwhisperer

    carwhisperer Formula Junior

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    OK that's all good but where, roughly, should the crank pulley be for TDC on cylinder number 1? Should the dots line up with the sensors? Should the flat spot be just past the 3 oclock sensor?
     
  11. plugzit

    plugzit F1 Veteran
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    Dot on front of crank pulley at 12 o'clock. Look down #1 hole to make sure you're using the right dot.
     
  12. Dave rocks

    Dave rocks F1 World Champ
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    With the cam covers on, you can go by the marks on the timing sprockets but they are not very accurate.

    Get yourself an indicator and put the probe down the cyclinder. Rotate crank, when indicator changes direction, you found TDC

    To do it perfectly, you need a screw in adaper and well guided indicator probe.
     
  13. carwhisperer

    carwhisperer Formula Junior

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    Thanks.
     
  14. carwhisperer

    carwhisperer Formula Junior

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    Which marks and with what do they align?
     
  15. Dave rocks

    Dave rocks F1 World Champ
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    The pulleys have marks on the face. They are to be at 12 o'clock. The belt covers have slits at 12 o'clock to see thru. Again, this is a very crude check. You need to get the WSM
     
  16. carwhisperer

    carwhisperer Formula Junior

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    #16 carwhisperer, Dec 19, 2015
    Last edited by a moderator: Sep 7, 2017
    Since my first post I have been able to read part of the WSM, but I can't find the part where it refers to any marks. I do see this diagram, but I can't see where it shows any marks. Are you saying there are marks on the cam pulleys?
    Image Unavailable, Please Login
     
  17. carwhisperer

    carwhisperer Formula Junior

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    Also, do you guys really run the engine for a few minutes after the belts are installed, then recheck, as the WSM suggests? This sounds pretty difficult to do.
     
  18. cf355

    cf355 F1 Rookie

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    run the motor sitting on the bench? Or re & re the motor a second time? No
    but I do turn the motor over a few times by the crankshaft pulley and check timing, gap and tension.
     
  19. SoCal1

    SoCal1 F1 Veteran
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    The translation is sketchy but read it in the other languages and it says turn the motor over a few times
     
  20. 2NA

    2NA F1 World Champ
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    #20 2NA, Dec 19, 2015
    Last edited by a moderator: Sep 7, 2017
    Forget any marks on cam pulleys. There's no guarantee that they were put back the same way the last time it was apart.

    The cam covers need to come off. You'll need a few gaskets. Take a good look at cam seals while you're there.

    Do it right or you'll be doing it all again.

    Notice how the marks line up in the photo. The timing is at factory spec. This is why you need the dial indicators and degree wheel to get it setup. The marks are only approximate. Sometimes they end up even farther off.
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  21. SoCal1

    SoCal1 F1 Veteran
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    Tim, how many degrees off was that one? That's the most off I seen
     
  22. Dave rocks

    Dave rocks F1 World Champ
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    Agreed which is why I said crude. He seems to want a very ballpark method but you will see I posted prior to use an idicator. IIRC, he is looking for approx for disassembly. I would (and do) it the proper way with proper tools.
     
  23. Europeanroadandracing

    Europeanroadandracing South Carolina
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    Definitely not a DIY for everyone.
     

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