Bonjour W.R.,
W. R. Gibbons wrote:
>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.
Yes, you are write I did a mistake, divide values by 10.
(read 0.05 and 0.2mm instead of 0.005 and 0.02mm).
W. R. Gibbons wrote:
> 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.
It is a good method that I will use to control clearence between
bearings shell and crankshaft but it is not adapted to control oversize
bearing shell.
I know this control is strange because usualy big end bore of connecting
rods
is not regrinded and bearing shells are sold with standard dimensions
for external diametre (I didn't found this dimension in my workshop
manual).
But in my case I am not sure of anything.
Don't you think an oversize too important is a risk ? what is tolerence
?
Amicalement,
Fred Saury from Lyon.
Alpine V de 1966.
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