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Alright....it is altogether too quiet on the List this weekend.
I tore down the engine from my 71 Fasty recently and have measured the
journals and have a question. The crank is clearly uncut, but how do I
decide if it needs to be cut or not?
Here is my theory. Let me know if my thinking is correct.
Minimum Journal Diameter (MJD)
=
Largest New Diameter - [(Radial Play Wear Limit - Upper Limit on New Radial
Play) x 2]
Using this formula and the specs in my Bentley, I calculated the following
Mimimum Journal Diameters. My actual average measurements are also listed.
Bearing # MJD Measured
(mm) (mm)
Main #1 54.83 54.88
Main #2 54.83 54.86
Main #3 54.83 54.88
Main #4 39.82 39.87
Rod #1 55.84 54.87
Rod #2 55.84 54.87
Rod #3 55.84 54.88
Rod #4 55.84 54.88
Cam #1 24.86 24.90
Cam #2 24.86 24.90
Cam #3 24.86 24.90
Given these numbers, should I have the crank reground .25mm (.010 in) under?
BTW, I still need to check the case.
Later,
John Jaranson
'71 FI AT Fasty (Jane)
'66 Square (???)
About Half a Late Square (Organ Donor)
http://mywebpages.comcast.net/jaransonT3/jaransonT3/ (This is my new
website address)
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