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Thread: Engine Broke 2.7 Post.

  1. 05-27-2022, 11:11 AM #31
    _gonbau
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    Quote Originally Posted by davep View Post
    Very interesting!. That is an unusual break. It appears the mechanic knew what he was saying about the broken crank. When you can, get good detailed photos of the break so that we can see if the cause of the break can be determined.
    If you are going to mount it on an engine stand, you need a special yoke (P201) that attaches to just one side of the case. It is used with heavy duty stand (P313) and flywheel lock (P215).
    I have the photos, the videos are on instgram! Now I upload images in detail!! It did not have the "yoke" so I opted to reduce the weight...once it was reduced I put it on the support and finished working there....I have treated "the weights" with great care but for now I see it as quite stable. Right now I am holding the engine casing with the generic support...With two screws BUT WITH LITTLE WEIGHT! IN CASE SOMEBODY THINK TO FOLLOW MY STEPS!! WITH NO WEIGHT...just the core. The yoke was too expensive for me.
    +
    I would like to ask... a crankshaft is made of some special steel that starts and does not leave residues?
    IMG_20220527_205150.jpgIMG_20220527_205154.jpgIMG_20220527_205205.jpgIMG_20220527_205209.jpgIMG_20220527_205226.jpgIMG_20220527_205233.jpgIMG_20220527_205238.jpgIMG_20220527_205256.jpg
    IMG_20220527_205328.jpg

    I have been very happy doing this. I hope that someone, "in time" will find these photos useful... do you think the crankshaft breakage has been as destructive as expected?
    Last edited by _gonbau; 05-27-2022 at 12:06 PM.
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  2. 05-27-2022, 02:02 PM #32
    davep
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    The break looks quite clean. I suspect that the presence of main bearing saddles on both side of the break helped to contain the separation of the halves. You will need a careful inspection of the case and rods to see if they can be reused.
    Porsche Historian, contact for Kardex & CoA-type Reports
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  3. 05-27-2022, 03:04 PM #33
    RSTarga
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    A lucky break.
    Amazing that nothing came through the case. Very little banging on the breaks, must have shut it down quickly.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs
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  4. 05-28-2022, 02:44 AM #34
    _gonbau
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    not. That's what's interesting and it amazes me... my father *drove the car around a couple of kilometers. the only thing that occurs to me is that where the oil was poured and kept the place greased is a thought but... any luck? you can see it well? these motors are extremely hard! How can I assess if there are burn marks? when magnesium changes its properties... what color does it take?
    Last edited by _gonbau; 05-28-2022 at 08:05 AM.
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  5. 05-28-2022, 05:47 AM #35
    72targa
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    You could go through all sorts of failure analysis but at this point I would only be concerned about your ability to still use the remaining parts and your capability (or your mechanic’s) ability to put them all back together properly. That was one heavy duty fracture.
    Peter Kane

    '72 911S Targa
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  6. 05-29-2022, 02:53 AM #36
    _gonbau
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    IMG_20220529_113500.jpgIMG_20220529_113452.jpgIMG_20220529_113449.jpgIMG_20220529_113444.jpgIMG_20220529_113438.jpgIMG_20220529_113336.jpgIMG_20220529_113330.jpgIMG_20220529_113316.jpgIMG_20220529_113313.jpgIMG_20220529_113257.jpg
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  7. 05-29-2022, 02:54 AM #37
    _gonbau
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    IMG_20220529_113251.jpgIMG_20220529_113242.jpg

    I have found two damages in the block.
    the first are the marks that can be seen in this last photo and the second I have to take a photo. I think nothing to worry about.

    At this point I feel compelled to ask... is this no longer a "practice" engine? According to what I appreciate, could it be rebuildable?
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  8. 05-29-2022, 05:51 AM #38
    mepstein
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    Everything is rebuildable. It just takes time and money.
    A part isn't purchased until paid.

    The 9 Store LLC.
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  9. 05-29-2022, 06:45 AM #39
    _gonbau
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    I know I need the book but I would like to ask... Do I have to take measurements of the block to buy a crankshaft? Or is it understood that the supports are fine? The "dolls/benches" I understand...they will all be changed but I wonder about measurements etc...Starting from the fact that I need a new crankshaft...What supports should I buy? Originals? Oversized depending on the measurements of the crankshaft you buy?
    +
    I'll take pictures of the piston skirts in detail if anyone finds them interesting!
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  10. 05-29-2022, 07:39 AM #40
    72targa
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    I truly appreciate your enthusiasm. We all have to start somewhere. Do you have access to a machine shop?
    Peter Kane

    '72 911S Targa
    Message Board Co-Moderator - Early 911S Registry #100
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