normal wear in MC block ?

[ed armstrong]

Terry,

Actually #4 is worse than #3 for wear, but #3 is
defintely second compared to the others.

Makes sense, since these cylineders see the highest
heat in the block.




--- "Tex Terry, II" <texactii at csonline.net> wrote:
> Ed - Just out of curiousity, and for my own
> learning, what kind of
> condition is the # 3 cylinder in?  It seems to me
> that if you have a
> problem on both sides of the # 3 (liner wall of 4-3
> and liner wall of 3-2),
> that maybe the # 3 is a contributing factor (maybe
> excessive heat causing
> oil thinning, then attributing to extra wear
> patterns).  But all this is
> just a guess, so I am asking so I can learn.  Tex.  
> 
> > 
> > On Mon, 09 July 2001, ed armstrong wrote:
> > 
> > 
> > Hi gang,
> > 
> > My turbo project is crawling along but I'm making
> > progress. 
> > 
> > Recently I took the head off the MC-1 for
> > refurbishment at the machinists and this gave me
> the
> > opportunity to inspect the top of the block. There
> was
> > one item I found that was a little disconcerting.
> > 
> > The cylinder wall (sleeve) in cylinder #4 is
> really
> > worn in the region between #4 and #3. It is only
> about
> > 1 mm thick, about half the thickness of many other
> > cylinder sleeves. The area between #3 and #2 is
> > similar. I realize this is the area with the
> highest
> > heat concentration where one would expect more
> wear
> > but does this sound right for a turbo motor with
> 140K
> > miles on it ?? Any opinions as to if this motor
> has
> > another 100K miles of life left in it ?
> > 
> > The Bently manual calls for measuring the "out of
> > round" of each cylinder at three depth locations
> but I
> > don't have the proper tools to do this accurately.
> > 
> > Thanks for any opinions.
> > 
> > 
> >  -ed
> 


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