Testarossa TDC and RPM sensor hole positions | FerrariChat
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Testarossa TDC and RPM sensor hole positions

Discussion in 'Boxers/TR/M' started by CAM-79, Jun 26, 2012.

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  1. CAM-79

    CAM-79 Rookie

    Apr 27, 2004
    23
    England, UK
    Full Name:
    Brent
    #1 CAM-79, Jun 26, 2012
    Hi,

    I'm currently rebuilding an engine on a '86 Testarossa.

    A previous owner had given up partly through. Cutting a long story short, he had purchased a new block which came without the holes for the TDC and RPM sensors and had these drilled.

    I'm not convinced that these holes are in the correct positions and want to be 100% before continuing with the build.

    Therefore, if possible I would like some photos of a block with the sensors removed
    so I can see what is seen through the holes or any technical info.

    If anyone could assist it would be much appreciated.

    Many thanks in advance.
     
  2. Mr.Chairman

    Mr.Chairman F1 Rookie

    Mar 21, 2008
    2,987
    New Jersey
    Full Name:
    Robbie
    #2 Mr.Chairman, Jun 26, 2012
    Photos of what you have please. I thought these sensors were at the clutch housing. Also fill out your profile.. Being a newby here its nice to know who you are plus we dont feel used and abused.. lol..


    R
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    BANNED Lifetime Rossa

    Jan 11, 2001
    26,822
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #3 Steve Magnusson, Jun 26, 2012
    The white RPM sensor should be directly over the teeth on the ring gear of the flywheel. The black TDC sensor should be ~15 mm more rearward towards the end of the block flange. I (roughly) measure the distances as:

    from end of block flange to white RPM sensor centerline = 28 mm

    from end of block flange to black TDC sensor centerline = 13 mm

    For the angular positions, you could probably measure the flywheel figure shown on page D6 in the TR WSM.

    Image Unavailable, Please Login
     
  4. CAM-79

    CAM-79 Rookie

    Apr 27, 2004
    23
    England, UK
    Full Name:
    Brent
    #4 CAM-79, Jun 26, 2012
    Last edited by a moderator: Sep 7, 2017
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    BANNED Lifetime Rossa

    Jan 11, 2001
    26,822
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #5 Steve Magnusson, Jun 26, 2012
    Last edited: Jun 26, 2012
    Agree that the position of the main center hole for the RPM sensor from the end of the block is probably OK (but might be off a bit angularly since it doesn't seem to be well centered in its cast boss) and that the main center hole for the TDC sensor will best be relocated, but the tapped holes look a little wonky too -- not in line with the center hole and not equally spaced from the corresponding center hole.

    You may also need to machine the height of each boss -- the distance from the end of each sensor when mounted to the the highest part of what it is sensing should be 0.5-0.7 mm per figure 5 on page D6.
     
  6. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    3,373
    #6 vincenzo, Jun 27, 2012
    Sorry to stray.... but it strikes me as strange.

    Why would a casting not come with these critcal holes pre-drilled?

    Rgds,
    Vincenzo
     
  7. CAM-79

    CAM-79 Rookie

    Apr 27, 2004
    23
    England, UK
    Full Name:
    Brent
    #7 CAM-79, Jun 28, 2012
    Thanks again Steve for the detailed info, we've taken several measurements and studied the page in the WSM as advised. We believe not only is the alignment is correct, but also found that the TDC hole that has been drilled is not even straight!

    Vincenzo, agree it is strange and why they weren't drilled is still a mystery.
     

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