On Fri, 7 Mar 1997, Fred Saury wrote:
> It's very important for me, because I am refitting my engine,
> Restore work on this engine has been started by someone else,
> and I have some doubt about this Job.
>
> My main problem, for moment, is on big end of connecting rods.
> I red in a book (very serious) that oversize of bearing shells
> in big end bore must not exceed 0.005mm and I have about 0.020mm.
> (+/-0.005 depending connecting rod).
> I measure it, by tightening only one nut on a side, and by measuring
> clearence with a feeler gauge between conecting rod
> and conecting rod cap on the other side.
Fred,
I don't mean to insult you, but have you mistaken inches for mm? I
assume the manual gives specifications in inches. An oversize of .005 mm
would only correspond to 0.0002 inches, which sounds very small.
I have not heard of examining bearing clearance in the way you describe.
I have not rebuilt an engine myself for 30 years, but the last time I did,
I used a soft plastic thread called "Plastiguage". You lay a piece of it
across the bearing journal on the crankshaft, tighten the rod big end,
then disassemble it. The smaller the bearing clearance, the more the
plastic thread is flattened. You compare the width of the flattened
thread to a chart on the package to determine the clearance.
> Fred Saury from Lyon.
> Alpine V de 1966.
>
Ray Gibbons Dept. of Molecular Physiology & Biophysics
Univ. of Vermont College of Medicine, Burlington, VT
gibbons(at)northpole.med.uvm.edu (802) 656-8910
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