[Ducati] Removing Crankshaft

Mon Dec 31 19:23:35 EST 2007

Good way to look at it. Typically if there is something wrong with the sotck set up it is too tight. I strongly recommend you reqd the stock shop manual as it is a pretty good look at setting preload. the concept is pretty simple you load a bearing enough that when it is running it is right. Not too tight, not too loose. Since the crank bearings are angular contact style bearings, meaning bearings meant to take a thrust load in at least one direction the idea is to load that surface just enough but not too much so that as others have said it loosens up just enough when it warms up. This loading is done with shims. The shop manual gives you an idea of what to look for when it is cold. This work requires a bit of knowledge about things, like how to install bearings by heating cases up in oven at 200 degrees so they drop right in etc etc. But lots of us have done this sort of work on one level or the other and many in out own garages, and we are not doing it for a living.
 Granted you may need to buy some tools you currently do not have. Do you have head nut wrench perhaps? If you do not you will not be retorquing the heads. You need to review the tools you need and understand what to do with them. What about torque wrench? Assembly lube? Etc. etc.  Again best place to start is with factory shop manual. Rich

Peter Bonner <dsi at swcp.com> wrote:  Barry,

One important thing to remember here is that we might all feel that
everything has to be absolutely perfect or some how it will just be a
disaster, remember that this is not an airplane motor. If the engine quits,
you won't be up there without a good L/D ratio and no airstrip handy. What
does that mean? Well basically if the tolerances that you try to set up are
to tight, you will know fairly quickly as the engine seizes, but in the
first place, you would have noticed it seemed really hard to rotate the
crank, so a little common sense will help a bunch. If it is way too loose,
you will feel that too in the assembly stage. If it is looser than what the
stock tolerance but not so loose as to damage anything, then just say you
set it to racing clearances :-)

Peter

----- Original Message ----- 
From: "Barry" 
To: "Ducati Owners Group" 
Sent: Sunday, December 30, 2007 9:08 PM
Subject: Re: [Ducati] Removing Crankshaft

> Thanks for the emails Rich. I understand what you are saying. Yes I am
> quick at learning and I enjoy working on my own bikes. I feel I can do
this
> project, I just don't like going into it blind. I did have a PDF download
I
> purchased last year that was the shop manual, unfortunately I ran into
> computer problems and lost it. But what ever I will find another one.
>
> I will take a lot of pictures like I have been doing. Once I drop this
> engine I will have questions. If you guys can put up with me I will do
this
> project. Thanks for the kick in the butt!
>
> Barry
>
>
> On 12/30/07 7:31 PM, "Rich Roberts" wrote:
>
> > I do not think any of us will disagree with Alex, Guy is pretty good. I
just
> > wish he would return tools. :) But you would not be the first guy to
take an
> > engine apart and get it back together and have it better than factory
without
> > sending wads of cash to someone. But you would seem to be at a
disadvantage in
> > that you do not even have a shop manual and uncertain tools. I am very
> > familair with Starrett catalog and I remember when MSC was just a small
tool
> > shop in NYC. But tools can be bought and figured out, what we do not
know is
> > how mechanically oriented you are, is this something you want to learn
to do
> > for yourself or do you simply just want to get it done. Granted some of
us had
> > help as we started down this path, I think I picked Igor and Jeff Nash's
brain
> > plenty and a good friend was old time buds with John Hoffman I think so
I had
> > folks I could turn to. heck I even had Eraldo on the phone a time or
two. But
> > you do not go there with out some base, meaning I already
> > had a plan an idea and how to go about it. Some of that comes from
doing and
> > some from reading and some becuase it is something you do not mind
doing. Some
> > folks do not even want to change their own oil you know. It is okay I
suppose.
> > You do have one advantage over several of us who have been at it going
on 20
> > years, you have this list. You have the internet. Good luck with this
project.
> > You can do it if you want. Rich
> >
> > Alexander M Ortner wrote: Hi Barry
> > While shipping the whole thing to Guy isn't the cheapest solution it is
> > probably the best. Guy is a perfectionist you will get the best work he
is
> > capable of he can't help himself.
> >
> > Alex Ortner
> > I can¹t go back and fix my mistakes
> >
> >
> >
> >
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> > 1:27 PM
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