Lost all gear oil today, 1991 Testarossa | Page 31 | FerrariChat

Lost all gear oil today, 1991 Testarossa

Discussion in 'Boxers/TR/M' started by PA32Pilot, May 9, 2020.

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  1. PA32Pilot

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    So I just used feeler gauges in .02mm increments and I can’t feel a difference until I get to .08 larger. I know .12 is too loose.

    I’m confident in preload. I’m going to disassemble, mount crown gear and finish backlash.

    If all goes well I may get to start reassembly tomorrow.
     
  2. turbo-joe

    turbo-joe F1 Veteran

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    ??? could it be that you not undertsand how all is working??? we discussed this problem already in this thread here. both side always equal change, if thicker or thinner, always the same when preload once is adjusted right

    so NO ! ! !
    when you use a smaller shim on the left cover you have to use the same amount of smaller on the right shim

    this is what I expected and have written in post 746

    I would try first only grind down to 1,62 for testing. you always can go down more but you cannot make thicker. even 1/100 more or less does not matter so much
     
  3. PA32Pilot

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    I’m an idiot. Yes it’s the SAME per side.
     
  4. PA32Pilot

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    Stay awake I’m putting differential in for backlash
     
  5. PA32Pilot

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    Preload is good. I’d say my backlash is good also.

    I think it’s time to assemble everything.
     
  6. PA32Pilot

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  7. turbo-joe

    turbo-joe F1 Veteran

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    you got your left side cover back already from brain?
    you are confusing me when you say backlash is good. so as in the video with the " click click" it never can be good ! ! !

    hahaha, we have here now nearly 2 pm and have to go to accupuncture now. will be back in about 5-6 hours

    before you assemble all please make a video of the backlash testing with the "click click", also may be with a dial gauge to see how many 1/100 mm you have
     
  8. turbo-joe

    turbo-joe F1 Veteran

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    sorry, wanted to write brian

    back now from accupuncture and feel fine again :)
    no more new info jamie? or gave up and relax for the weekend ;)
     
  9. PA32Pilot

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    Yessir I got it back Friday.

    I’ll post a video today when I get back. I heated up the LH cover and installed the racer last night.

    I’m going to install all seals and put her back together here shortly.
     
  10. turbo-joe

    turbo-joe F1 Veteran

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    before you put in the seals test the backlash, with "sound- click click" and with gauge please
    like to get sure all will be ok
    what says brian abou tthe cover? what difference? if there is one
     
  11. PA32Pilot

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    None, there are no measuring differences between the covers. Ferrari changed the part number for some reason but it wasn’t for anything noticeable.
     
  12. turbo-joe

    turbo-joe F1 Veteran

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    strange that I had to grind some material from my cover away. I wonder ! ! !
     
  13. PA32Pilot

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    Not a lot of room but enough. Using feeler gauges it’s roughly 1.75mm gap
    Image Unavailable, Please Login
     
  14. PA32Pilot

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    I hear a faint click and my indicator is showing .003 on my backlash.
     
  15. turbo-joe

    turbo-joe F1 Veteran

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    0,003 - mm or inch?
    as I have written already those different measurements are confusing
    can you make a video?
     
  16. PA32Pilot

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    .003” so .08mm.

    Tried to take a video but can’t get in there with the dial and me having both arms pushing on differential.

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  17. PA32Pilot

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    Beat video I can get

     
  18. turbo-joe

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    this sounds good :) and the 0,08 is also ok. so turn the diff 180 ° and measure again. if same readinsg than you may put all together.

    so what shim size you have now left and right?
     
  19. PA32Pilot

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    Other side was .0035 but that’s about as close to the same as I’ll get.

    Yesterday my preload was good, little on the high side, with:
    RH cover 1.55mm
    LH cover 2.9mm

    Now with correct backlash I have:

    RH cover 1.66mm
    LH cover 3.0mm

    So I made a .1mm change on each side.
     
  20. PA32Pilot

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    RH cover goes with this hole up?

    I didn’t catch this when I disassembled and didn’t make a note.
     
  21. turbo-joe

    turbo-joe F1 Veteran

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    what you understand under: high side? so too much or too less?

    can you please make again a video with not moving the cam? cannot see exactly the diff turning because the cam moves too much. will see tomorrow?

    yes, for oiling the bearing
     
  22. versamil

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    Yes he got his left side cover back from Brian. The new and improved 512M cover is the same as the older Testarossa cover. The dimensions between the flange face where it abuts the differential case, to the seat for the cup of the taper roller bearing was within .001. Nothing else about the 512M housing was any different other than the mounting flange was .005 thicker than my cover. This dimension means nothing. So it's NOT any stronger, bigger, badder, than the original. The ONLY difference is the countersunk hole at the five o'clock position where it mounts. something must attach at that stud on a 512M. The two projections that rest on the saddle of the case were within .001 ( or .0254mm for those challenged by our goofy measuring system) of the height of my original 1985 cover.

    Interesting to see Algar has the latest, greatest 512M differential assembly on Ebay- item number 163828330771 So instead of machining out the part from a solid billet, they have CAST the part. The core even takes care of the four round holes around the diameter, and has a large relief for the four keyways. Fact the keys are exposed on the bottom. They could broach the keys, use a wire EDM, or use a slotter to cut the keys. The part almost looks crude. Comes complete with the spider gears and clutches. For sale at $4975.00, discounted from Ferraris $13,000.00 list price. Other than NOT being welded, an improvement??

    While some may think that the bearing tolerances are of no consideration, when a bearing is within spec with a .008 (.2032 mm) length tolerance, that's a pretty big variable to throw into the equation. When I order new bearings for the two Testarossa's I'm doing, I will be checking their assembled heights, just to see how much different they are. I'll be machining my own differential to replace my original welded ones. I'll have measured THREE housings to get the dimensions to machine to.
     
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  23. PA32Pilot

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  24. PA32Pilot

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    Yes yesterday we agreed a little too much preload but you mentioned it’s not a problem with good fear oil.
     
  25. PA32Pilot

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