Frozen ABA crank during rebuild pt II

[area53 at validpath.com (Jeff Toomasson)]

I double- and trile-checked the orientation of everything when I first 
installed it and checked again last night - everything's where it should be 
(but everything's marked in a chiral fashion, so if you pay attention, it's 
kinda hard to mees that up...)

Anyway, not sure about the true-ness (?) or the rod. I still should probably 
check the movement of the rod cap and base on the other side of the crank 
surface...I just can't figure out how all of a sudden the rod has no axial play 
on a motor that had 70k on it prior to teardown.

What I'll probably do is use one my 3A rods to try to pinpoint the problem to 
either the crank or the rod. The journal is the same size and they share the 
same bearings so it should work...

Maybe I'll just have to sport for a TDI crank!!!   muuuuhuuuhwwwahahahaha!  :)

Wish me luck - 

Jeff

> Any chance you have a bent rod?  Or something is installed backwards? 
> (thinking rod-piston).
> 
> Ron
> 
> --- Jeff_Toomasson <area53@validpath.com> wrote:
>> First - thanks to those who responded the first time around.
>> 
>> Taking Anson's advice, I checked the axial play of the rods and isolated
>> the  binding to piston/rod assembly #2. Sure enough, removal of piston/rod
>> #2  allowed the crank to spin smoothly. Then I collapsed the rings of
>> piston #2  and installed it upside-down from the top and was able to lift
>> and lower it  pretty easily by hand. On top of that, I took both the rod
>> cap and rod base  (w/ bearings) and "rotated" them around the underside of
>> the #2 crank bearing  surface with no problem.
>> 
>> But I bolt it all back together and it binds...ggrrrrr....axial play is
>> not  manually detectable (I don't have feeler gauges)
>> 
>> My theories:
>> 
>> 1) something on the side of the rod journal is binding on the crank or
>> it's  just too wide
>> 
>> 2) some portion of the #2 crank surface is warped
>> 
>> Again, rod/main bearings are new and standard and have passed tolerances
>> as  measured by plastigauge.
>> 
>> Can I have the rod machined on the sides to increase axial clearance? Is
>> this  not recommended?
>> 
>> Input is always welcome.
>> 
>> Thanks, Jeff
>> 
>> 
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> 
> 
> 
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