206 Dino cylinder liners/sleeves.

Discussion in 'Technical Q&A' started by omulec, Oct 20, 2017.

  1. omulec

    omulec Rookie

    Nov 26, 2008
    Hi everyone,

    Working on my 206 Dino 2-liter 135B000 engine, I'm stuck. I've ordered from Superformance quite a batch of new parts (crankshaft, bearings, pistons, liners, con-rods) - everything nominal, and now the machine shop got confused. On top of that we cannot find the information anywhere.

    The new liners has interference fit with the block of around 0,04” (0,1mm), which in the shop opinion is way to much, even for wet liners without the seal rings.

    I would really appreciate if someone will share the information:
    1) What should be the interference fit (or outside diameter) of stock liner? In short - how much bigger the diameter of the liner should be than the hole in the block?
    2) As it's no seal ring liner, what should be the fit procedure? Heating the block and freezing the liner?
    3) The liner should be mounted with zero protrusion (so no sticking out of the block), or there should be some value?
    4) Maybe someone could share the mounting procedure?

    Thanks in advance, because we are blind here.
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  3. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    The earliest manual I have is for a 2V 308 GT4.

    it states: "Liner protrusion from the gasket face, without seal ring A, must be between mm. 0,01 ± 0.05 and it should be equal for all liners of each cylinder file and near 0,03.
    Use gauge 542-CS-6768 for this checking"

    This manual does not state how liners are inserted into block.
  4. Dave rocks

    Dave rocks F1 World Champ

    Nov 23, 2012
    Orchard Park, NY
    Full Name:
    Dave Lelonek
    #3 Dave rocks, Oct 21, 2017
    Last edited: Oct 21, 2017
    .1mm = .0039 inches, or rounded to .004 inches. That's much smaller than the .04 inches you post. Regardless, I'd also say that .004" is quite a bit of interference that will result in the wall collapsing.

    Here is the WSM:

    EDIT: just noticed you said 206 Dino and not 246
  5. TTR

    TTR F1 Rookie
    Rossa Subscribed

    Mar 29, 2007
    Riverside, CA
    Full Name:
    If all else fails, buy and read (factory issued) shop manual.
    Honestly, why would anyone even start a job like this without one on hand ?
    Copies should be readily available.
  6. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    Berkeley, CA
    Full Name:
    Brian Brown
    #5 Motob, Oct 22, 2017
    Last edited: Oct 22, 2017
    The liners need to protrude above the surface of the cylinder. The need to contact the fire ring on the head gasket in order to provide a good seal. Too much protrusion will cause the gasket not to crush enough and it will not seal around the coolant/oil passages. It all depends on the type/manufacturer of head gasket.

    The interference fit on the liners has a great deal to do with what they are made from,as the coeficient of expansion of the liners has a large impact on this value.

    Someone with experience building these motors with the head gaskets that are presently available will know how much interference fit and protrusion you will need. But that comes with time and experience, so getting that information may require that they build the engine.

    What does Superformance and the manufacturer of the liners recommend?
    How much experience does the machine shop have with Dino motors?
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  8. Gleggy

    Gleggy Formula 3

    Sep 22, 2004
    Land of Oz
    Full Name:
    You also need to talk to Dave Helms at Scuderia Rampante in Eire Colorado.
    Dave has got his new Head gaskets for these cars, as well as all the Carb Ferrari's up and in production, that finally fixes the leaking head gasket saga.
    He has had excellent results.
  9. omulec

    omulec Rookie

    Nov 26, 2008
    Thanks for the hints.

    I've been in touch with Dave Helms, as well as with Superformance.

    It seems that the situation is a mystery. Dave suggest, that they are press-fit liners with the fit interference between 0,0020" - 0,0025".
    The workshop manual doesn't says anything about liners replacement, so we cannot base on anything here. Superformans sub-supplier says it should be 0,0015" press-fit with a sealant. Well... hmm...
  10. ago car nut

    ago car nut F1 Veteran
    Silver Subscribed

    Aug 29, 2008
    Madison Ohio
    Full Name:
    David A.
    The difference between .0015 and .002 is minimal. Temperature change can make the difference. What type of sealant go they recommend?
  11. Ferraripilot

    Ferraripilot F1 World Champ
    Project Master Owner

    May 10, 2006
    Full Name:
    It's man
    .002 is just right. Any more and they will be very difficult to install. I'm not totally against hitting the outside of the liners with a very light sandpaper, say 1000-1500, wet sanded to meet spec. I would not think removing that additional .0015-.002 too difficult.
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  13. Merlin Auto Group

    Merlin Auto Group Formula Junior

    Nov 18, 2016
    This is Wade Williams. In my experience, on that style block, .0015-.0020 is the proper press for the sleeves.
    Finishing the bore after the sleeves are in will the issue. The main web is so close to the sleeve bottom, it is very hard to hone the bottom of the hole without making the middle too big.
    As for the sealing part, I use a liquid type silicone sealer that has a pretty long set up time. This allows you to get the sleeves in and set before the silicone cures.
    I do all my own machine work and I am happy to help you if I can.
  14. ago car nut

    ago car nut F1 Veteran
    Silver Subscribed

    Aug 29, 2008
    Madison Ohio
    Full Name:
    David A.
    Your not going to remove anything hand sanding with 1000 grit paper
  15. 335s

    335s Formula Junior

    Jan 17, 2007
    SF Bay Area
    Full Name:
    T. Monma
    repec range is: .07 to .11 MM with the ideal being .09 MM

    this is done AFTER the deck has been reground using the center line of the crankshaft as your god reference position
    The squaring of the block is then 30 degrees off of the vertical mid-line-which means you need a precision grinding apparatus
    I use an 856 Kwik-Way with custom center-less ground, size for size housing bore bars to mount the block into machine. The squaring
    is done with Swiss precision instrumentation (Etalon), or Mahr (German)
    This dimension is found in all wet liner Ferraris from the early 1950s to the late 1980s.....(been doing machineshop repairs on these since the 1970s, so this isnt my first rodeo)

    The REAL problems are sealing in the headgaskets....
    good luck there....

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